Wiring

STM32F103C Blue-Pill wiring:

Debug monitor   Serial(0) -->TX1 Pin A9
                          <--RX1 Pin A10  
                          
Telemetry-in    Serial1   -->TX2 Pin A2   
                          <--RX2 Pin A3 
                          
Compass         Optional     SCL Pin B6                          
                             SDA Pin B7 
                             
Azimuth Servo                    Pin A7 
Elevation Servo                  Pin A8 

SetHome button                   Pin A5

StatusLed                        Pin A6 - Off=No good GPS yet, flashing=good GPS but home not set yet, solid = ready to track
                              
Vcc - 3.3V      IMPORTANT!
Gnd