// Arduino Uno USB output adapter. Servo library required.
// FORWARD-ONLY ESC: stop=1000 us, steering center=1500 us.
// Verify stop pulse for YOUR ESC. No aircraft/rotor mixing.
#include <Servo.h>
Servo esc, steering;
const bool ENABLE_OUTPUTS = false; // Change only after a powered-off wiring check.
char buffer[64]; uint8_t used=0; unsigned long lastFrame=0;
void stopOutputs(){if(ENABLE_OUTPUTS){esc.writeMicroseconds(1000);steering.writeMicroseconds(1500);}}
void setup(){Serial.begin(115200);if(ENABLE_OUTPUTS){esc.attach(9,1000,2000);steering.attach(10,1000,2000);}stopOutputs();}
void loop(){
 if(millis()-lastFrame>500)stopOutputs();
 while(Serial.available()){
  char c=Serial.read();
  if(c=='\n'){
   buffer[used]=0;int armed=0,t=0,s=0;char extra;
   if(sscanf(buffer,"%d,%d,%d%c",&armed,&t,&s,&extra)==3&&(armed==0||armed==1)&&t>=1000&&t<=2000&&s>=1000&&s<=2000){
    lastFrame=millis();if(ENABLE_OUTPUTS&&armed){esc.writeMicroseconds(t);steering.writeMicroseconds(s);}else stopOutputs();
   }else stopOutputs();
   used=0;
  }else if(used<sizeof(buffer)-1)buffer[used++]=c;else{used=0;stopOutputs();}
 }
}