unify pin naming scheme

examples/SpeechTX/SpeechTX.ino

@@ -12,7 +12,7 @@
 
 #include <HamShield.h>
 
-#define PWM_PIN 3
+#define MIC_PIN 3
 #define RESET_PIN A3
 #define SWITCH_PIN 2
 
@@ -230,8 +230,8 @@ const uint8_t spYELLOW[]        PROGMEM = {0x69,0xBD,0x56,0x15,0xAC,0x67,0xE5,0x
 
 void setup() {
   // NOTE: if not using PWM out, it should be held low to avoid tx noise
-  pinMode(PWM_PIN, OUTPUT);
-  digitalWrite(PWM_PIN, HIGH);
+  pinMode(MIC_PIN, OUTPUT);
+  digitalWrite(MIC_PIN, HIGH);
   
   // prep the switch
   pinMode(SWITCH_PIN, INPUT_PULLUP);