#define PTM 34
void setup(){
  Serial.begin(9600);
  pinMode(PTM, OUTPUT);
}
void loop(){
  int sensorValue = analogRead(34);
  Serial.print("ADC 10 bit = ");
  float volts = 5.00*(float)sensorValue/4095.00;
  Serial.print(", Voltage = ");
  Serial.print(volts,2);
  Serial.print("v");
  delay(1);
}