Crazyflie motor test stand GUI (cflib + DearPyGui)
uv-managed Python app for ramping Crazyflie 2.1 / Bolt motors on a
thrust test stand over a Crazyradio.
- cf_link.py: thread-safe cflib wrapper — scan/connect, supervisor
arming (send_arming_request) with legacy forceArm fallback, motor
override via motorPowerSet params, battery + estimator-state logging,
firmware-console capture, and a log buffer for the UI console.
- app.py: DearPyGui UI with a per-frame ramp loop.
* Linked / individual motor control, sliders + numeric entry (percent)
* Max-throttle limit, ramp rate, EMERGENCY STOP (button + SPACE)
* ARM button: disabled when disconnected, green when ready, yellow
when armed
* Telemetry: estimator-state panel (pose/yaw/flow), throttle + battery
plots that start at zero and only scroll while armed (freeze on disarm)
* Live console panel (app + cflib + firmware messages)
Benign cflib warnings (stale log blocks, missing optional params) are
filtered; safety teardown disarms on disconnect/quit.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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test_stand/app.py
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435
test_stand/app.py
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"""DearPyGui front-end for the Crazyflie motor test stand.
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The render loop is driven manually so motor ramps advance smoothly every
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frame: sliders set per-motor *targets*, and each frame the current output is
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moved toward its target at the configured ramp rate, then the resulting PWM is
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pushed to the Crazyflie only when it changes.
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Safety model:
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* Motors never move until you press ARM (and throttle starts at 0).
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* A max-throttle limit clamps every target.
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* EMERGENCY STOP (button or SPACE) cuts all motors instantly.
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* Disconnecting or losing the link disarms automatically.
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"""
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from __future__ import annotations
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import time
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import dearpygui.dearpygui as dpg
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from .cf_link import (CrazyflieLink, LOG_BUFFER, PWM_MAX,
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ENABLE_INDIVIDUAL, ENABLE_ALL)
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NUM_MOTORS = 4
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PLOT_WINDOW_S = 30.0 # seconds of history to keep in the plots
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class MotorChannel:
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"""Tracks a motor's target (slider) and ramped current output."""
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def __init__(self) -> None:
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self.current = 0.0 # % actually being output (after ramp)
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self.last_pwm = -1 # last value sent to the radio (-1 = never)
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def step(self, target_pct: float, rate_pps: float, dt: float) -> None:
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delta = target_pct - self.current
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max_step = rate_pps * dt
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if abs(delta) <= max_step:
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self.current = target_pct
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else:
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self.current += max_step if delta > 0 else -max_step
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@property
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def pwm(self) -> int:
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return int(round(self.current / 100.0 * PWM_MAX))
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class TestStandApp:
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def __init__(self) -> None:
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self.link = CrazyflieLink()
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self.motors = [MotorChannel() for _ in range(NUM_MOTORS)]
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self._last_frame = time.monotonic()
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self._armed_mode = None # enable mode currently armed with, or None
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self._plot_t0 = None # monotonic time of arming; None while disarmed
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self._plot_t: list[float] = []
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self._plot_throttle: list[float] = []
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self._plot_vbat: list[float] = []
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self._console_version = -1
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# ------------------------------------------------------------------
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# UI construction
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# ------------------------------------------------------------------
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def build(self) -> None:
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dpg.create_context()
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with dpg.theme() as estop_theme:
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with dpg.theme_component(dpg.mvButton):
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dpg.add_theme_color(dpg.mvThemeCol_Button, (170, 30, 30))
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dpg.add_theme_color(dpg.mvThemeCol_ButtonHovered, (210, 40, 40))
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dpg.add_theme_color(dpg.mvThemeCol_ButtonActive, (240, 60, 60))
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self._estop_theme = estop_theme
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# ARM button: green when ready to arm, yellow once armed.
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with dpg.theme() as arm_ready_theme:
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with dpg.theme_component(dpg.mvButton):
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dpg.add_theme_color(dpg.mvThemeCol_Button, (35, 130, 45))
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dpg.add_theme_color(dpg.mvThemeCol_ButtonHovered, (45, 160, 55))
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dpg.add_theme_color(dpg.mvThemeCol_ButtonActive, (55, 185, 65))
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self._arm_ready_theme = arm_ready_theme
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with dpg.theme() as armed_theme:
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with dpg.theme_component(dpg.mvButton):
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dpg.add_theme_color(dpg.mvThemeCol_Button, (200, 170, 30))
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dpg.add_theme_color(dpg.mvThemeCol_ButtonHovered, (225, 195, 45))
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dpg.add_theme_color(dpg.mvThemeCol_ButtonActive, (245, 215, 60))
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dpg.add_theme_color(dpg.mvThemeCol_Text, (20, 20, 20))
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self._armed_theme = armed_theme
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with dpg.window(tag="primary"):
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self._build_connection()
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dpg.add_separator()
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self._build_safety()
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dpg.add_separator()
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self._build_motors()
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dpg.add_separator()
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self._build_plots()
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dpg.add_separator()
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self._build_console()
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# SPACE = emergency stop, available anywhere.
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with dpg.handler_registry():
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dpg.add_key_press_handler(dpg.mvKey_Spacebar, callback=self._on_estop)
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dpg.create_viewport(title="Crazyflie Motor Test Stand", width=900, height=1010)
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dpg.setup_dearpygui()
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dpg.show_viewport()
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dpg.set_primary_window("primary", True)
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def _build_connection(self) -> None:
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dpg.add_text("Connection")
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with dpg.group(horizontal=True):
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dpg.add_combo([], tag="uri_combo", width=320,
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default_value="(scan for devices)")
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dpg.add_button(label="Scan", callback=self._on_scan)
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dpg.add_button(label="Connect", tag="connect_btn",
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callback=self._on_connect_toggle)
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with dpg.group(horizontal=True):
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dpg.add_text("Status:")
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dpg.add_text("disconnected", tag="status_text")
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with dpg.group(horizontal=True):
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dpg.add_text("Battery:")
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dpg.add_text("-- V", tag="vbat_text")
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dpg.add_text(" Link:")
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dpg.add_text("--", tag="link_text")
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def _build_safety(self) -> None:
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dpg.add_text("Safety")
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with dpg.group(horizontal=True):
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dpg.add_button(label="ARM", tag="arm_btn", width=120,
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callback=self._on_arm_toggle, enabled=False)
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estop = dpg.add_button(label="EMERGENCY STOP (SPACE)", width=260,
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callback=self._on_estop)
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dpg.bind_item_theme(estop, self._estop_theme)
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dpg.add_slider_float(label="Max throttle limit (%)", tag="max_limit",
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default_value=30.0, min_value=0.0, max_value=100.0,
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width=300)
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dpg.add_slider_float(label="Ramp rate (%/s)", tag="ramp_rate",
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default_value=20.0, min_value=1.0, max_value=200.0,
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width=300)
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dpg.add_text("", tag="warn_text", color=(230, 180, 40))
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def _build_motors(self) -> None:
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dpg.add_text("Motors")
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dpg.add_radio_button(("Linked (all together)", "Individual"),
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tag="mode_radio", default_value="Linked (all together)",
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horizontal=True, callback=self._on_mode_change)
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with dpg.group(horizontal=True):
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dpg.add_slider_float(label="", tag="master", default_value=0.0,
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min_value=0.0, max_value=100.0, width=360,
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callback=self._sync_from_slider, user_data="master")
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dpg.add_input_float(tag="master_input", default_value=0.0,
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min_value=0.0, max_value=100.0, step=1.0,
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format="%.1f", width=110, min_clamped=True,
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max_clamped=True, on_enter=True,
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callback=self._sync_from_input, user_data="master")
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dpg.add_text("Master throttle (%)")
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with dpg.group(horizontal=True):
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dpg.add_button(label="All to 0", callback=lambda: self._set_all_targets(0))
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dpg.add_text(" (type a value or drag; output ramps at the rate above)")
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for i in range(NUM_MOTORS):
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with dpg.group(horizontal=True):
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dpg.add_slider_float(label="", tag=f"motor_{i}", default_value=0.0,
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min_value=0.0, max_value=100.0, width=280,
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callback=self._sync_from_slider,
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user_data=f"motor_{i}")
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dpg.add_input_float(tag=f"motor_{i}_input", default_value=0.0,
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min_value=0.0, max_value=100.0, step=1.0,
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format="%.1f", width=110, min_clamped=True,
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max_clamped=True, on_enter=True,
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callback=self._sync_from_input,
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user_data=f"motor_{i}")
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dpg.add_text(f"M{i + 1} (%)")
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dpg.add_text("out: 0.0% (0)", tag=f"motor_out_{i}")
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def _build_plots(self) -> None:
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dpg.add_text("Telemetry")
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dpg.add_text("Estimator state")
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dpg.add_text("Pos (m): --", tag="est_pos")
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dpg.add_text("Yaw: --", tag="est_yaw")
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dpg.add_text("Flow counts: --", tag="est_flow")
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dpg.add_separator()
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with dpg.plot(label="Output throttle (avg %)", height=180, width=-1):
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dpg.add_plot_axis(dpg.mvXAxis, label="t (s)", tag="thr_x")
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dpg.set_axis_limits("thr_x", 0, PLOT_WINDOW_S)
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with dpg.plot_axis(dpg.mvYAxis, label="%", tag="thr_y"):
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dpg.set_axis_limits("thr_y", 0, 100)
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dpg.add_line_series([], [], tag="thr_series")
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with dpg.plot(label="Battery (V)", height=180, width=-1):
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dpg.add_plot_axis(dpg.mvXAxis, label="t (s)", tag="vbat_x")
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dpg.set_axis_limits("vbat_x", 0, PLOT_WINDOW_S)
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with dpg.plot_axis(dpg.mvYAxis, label="V", tag="vbat_y"):
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dpg.set_axis_limits("vbat_y", 2.8, 4.3)
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dpg.add_line_series([], [], tag="vbat_series")
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def _build_console(self) -> None:
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with dpg.group(horizontal=True):
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dpg.add_text("Console")
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dpg.add_button(label="Clear", callback=lambda: LOG_BUFFER.clear())
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with dpg.child_window(tag="console_child", height=170, width=-1):
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dpg.add_text("", tag="console_text", wrap=860)
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# ------------------------------------------------------------------
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# Callbacks
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# ------------------------------------------------------------------
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def _on_scan(self) -> None:
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uris = self.link.scan()
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if uris:
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dpg.configure_item("uri_combo", items=uris)
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dpg.set_value("uri_combo", uris[0])
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else:
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dpg.configure_item("uri_combo", items=[])
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dpg.set_value("uri_combo", "(none found)")
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def _on_connect_toggle(self) -> None:
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state = self.link.snapshot()
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if state.status in ("connected", "connecting"):
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self.link.disconnect()
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return
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uri = dpg.get_value("uri_combo")
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if uri and uri.startswith(("radio://", "usb://")):
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self.link.connect(uri)
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def _on_arm_toggle(self) -> None:
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state = self.link.snapshot()
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if state.armed:
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self._disarm()
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else:
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self._arm()
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def _arm(self) -> None:
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mode = self._enable_mode()
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missing = self.link.arm(mode)
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self._armed_mode = mode
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if missing:
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dpg.set_value("warn_text",
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"firmware missing params: " + ", ".join(missing))
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else:
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dpg.set_value("warn_text", "")
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def _disarm(self) -> None:
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self.link.disarm()
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self._armed_mode = None
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self._set_all_targets(0)
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def _on_estop(self, *_) -> None:
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self.link.emergency_stop()
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self._armed_mode = None
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self._set_all_targets(0)
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for m in self.motors:
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m.current = 0.0
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def _on_mode_change(self, *_) -> None:
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# Re-arm with the matching enable mode if currently armed.
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if self._armed_mode is not None:
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self._arm()
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def _sync_from_slider(self, sender, app_data, user_data) -> None:
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# Slider moved -> mirror its value into the paired text box.
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dpg.set_value(f"{user_data}_input", app_data)
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def _sync_from_input(self, sender, app_data, user_data) -> None:
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# Text box committed -> clamp and mirror into the slider.
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value = max(0.0, min(100.0, app_data))
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dpg.set_value(user_data, value)
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dpg.set_value(f"{user_data}_input", value)
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def _set_target(self, base_tag: str, value: float) -> None:
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dpg.set_value(base_tag, value)
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dpg.set_value(f"{base_tag}_input", value)
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def _set_all_targets(self, value: float) -> None:
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self._set_target("master", value)
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for i in range(NUM_MOTORS):
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self._set_target(f"motor_{i}", value)
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# ------------------------------------------------------------------
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# Per-frame update
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# ------------------------------------------------------------------
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def _enable_mode(self) -> int:
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linked = dpg.get_value("mode_radio").startswith("Linked")
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return ENABLE_ALL if linked else ENABLE_INDIVIDUAL
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def _targets(self) -> list[float]:
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"""Effective per-motor targets after mode + max-limit are applied."""
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max_pct = dpg.get_value("max_limit")
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linked = dpg.get_value("mode_radio").startswith("Linked")
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if linked:
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t = dpg.get_value("master")
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raw = [t] * NUM_MOTORS
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else:
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raw = [dpg.get_value(f"motor_{i}") for i in range(NUM_MOTORS)]
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return [max(0.0, min(max_pct, v)) for v in raw]
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def update(self) -> None:
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now = time.monotonic()
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dt = now - self._last_frame
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self._last_frame = now
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state = self.link.snapshot()
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rate = dpg.get_value("ramp_rate")
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targets = self._targets()
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armed = state.armed and state.status == "connected"
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linked = dpg.get_value("mode_radio").startswith("Linked")
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for i, m in enumerate(self.motors):
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# When disarmed, force everything to zero so nothing lingers.
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m.step(targets[i] if armed else 0.0, rate, dt)
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# Push changed PWM values to the radio.
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if armed:
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if linked:
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pwm = self.motors[0].pwm
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if pwm != self.motors[0].last_pwm:
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self.link.set_all(pwm)
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for m in self.motors:
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m.last_pwm = pwm
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else:
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for i, m in enumerate(self.motors):
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if m.pwm != m.last_pwm:
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self.link.set_motor(i + 1, m.pwm)
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m.last_pwm = m.pwm
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self._refresh_widgets(state, armed)
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self._refresh_estimator()
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self._refresh_plots(now, state, armed)
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self._refresh_console()
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def _refresh_estimator(self) -> None:
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est = self.link.estimator # atomic read of the published snapshot
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if not est.valid:
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dpg.set_value("est_pos", "Pos (m): --")
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dpg.set_value("est_yaw", "Yaw: --")
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dpg.set_value("est_flow", "Flow counts: --")
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return
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dpg.set_value("est_pos",
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f"Pos (m): x {est.x:+.2f} y {est.y:+.2f} z {est.z:+.2f}")
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dpg.set_value("est_yaw", f"Yaw: {est.yaw:+.1f} deg")
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if est.has_flow:
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dpg.set_value("est_flow", f"Flow counts: dx {est.dx:+d} dy {est.dy:+d}")
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else:
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dpg.set_value("est_flow", "Flow counts: (no Flow deck)")
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def _refresh_console(self) -> None:
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version, lines = LOG_BUFFER.snapshot()
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if version == self._console_version:
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return
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self._console_version = version
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# Keep following the tail only if the user is already at the bottom.
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try:
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at_bottom = (dpg.get_y_scroll("console_child")
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>= dpg.get_y_scroll_max("console_child") - 2.0)
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except Exception:
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at_bottom = True
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dpg.set_value("console_text", "\n".join(lines))
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if at_bottom:
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dpg.set_y_scroll("console_child", -1.0)
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def _refresh_widgets(self, state, armed: bool) -> None:
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dpg.set_value("status_text", state.message or state.status)
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dpg.set_value("vbat_text", f"{state.vbat:.2f} V" if state.vbat else "-- V")
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dpg.set_value("link_text", f"{state.link_quality:.0f}%")
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connected = state.status == "connected"
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dpg.configure_item("connect_btn",
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label="Disconnect" if state.status in ("connected", "connecting")
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else "Connect")
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dpg.configure_item("arm_btn", enabled=connected,
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label="DISARM" if state.armed else "ARM")
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# Disabled when not connectable; green when ready to arm; yellow when armed.
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if not connected:
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dpg.bind_item_theme("arm_btn", 0)
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elif state.armed:
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dpg.bind_item_theme("arm_btn", self._armed_theme)
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else:
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dpg.bind_item_theme("arm_btn", self._arm_ready_theme)
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for i, m in enumerate(self.motors):
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dpg.set_value(f"motor_out_{i}", f"out: {m.current:5.1f}% ({m.pwm})")
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def _refresh_plots(self, now: float, state, armed: bool) -> None:
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# Only collect/scroll while armed; the trace freezes when disarmed.
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if not armed:
|
||||
self._plot_t0 = None
|
||||
return
|
||||
if self._plot_t0 is None:
|
||||
# Arming transition: restart the time axis from zero.
|
||||
self._plot_t0 = now
|
||||
self._plot_t.clear()
|
||||
self._plot_throttle.clear()
|
||||
self._plot_vbat.clear()
|
||||
|
||||
t = now - self._plot_t0
|
||||
avg = sum(m.current for m in self.motors) / NUM_MOTORS
|
||||
self._plot_t.append(t)
|
||||
self._plot_throttle.append(avg)
|
||||
self._plot_vbat.append(state.vbat)
|
||||
|
||||
# Drop history outside the rolling window.
|
||||
while self._plot_t and self._plot_t[0] < t - PLOT_WINDOW_S:
|
||||
self._plot_t.pop(0)
|
||||
self._plot_throttle.pop(0)
|
||||
self._plot_vbat.pop(0)
|
||||
|
||||
dpg.set_value("thr_series", [self._plot_t, self._plot_throttle])
|
||||
dpg.set_value("vbat_series", [self._plot_t, self._plot_vbat])
|
||||
dpg.set_axis_limits("thr_x", max(0, t - PLOT_WINDOW_S), max(PLOT_WINDOW_S, t))
|
||||
dpg.set_axis_limits("vbat_x", max(0, t - PLOT_WINDOW_S), max(PLOT_WINDOW_S, t))
|
||||
|
||||
# ------------------------------------------------------------------
|
||||
# Run loop
|
||||
# ------------------------------------------------------------------
|
||||
def run(self) -> None:
|
||||
self.build()
|
||||
try:
|
||||
while dpg.is_dearpygui_running():
|
||||
self.update()
|
||||
dpg.render_dearpygui_frame()
|
||||
finally:
|
||||
# Best-effort: never leave the bench armed.
|
||||
try:
|
||||
self.link.emergency_stop()
|
||||
self.link.disconnect()
|
||||
except Exception:
|
||||
pass
|
||||
dpg.destroy_context()
|
||||
|
||||
|
||||
def main() -> None:
|
||||
TestStandApp().run()
|
||||
|
||||
|
||||
if __name__ == "__main__":
|
||||
main()
|
||||
Reference in New Issue
Block a user