float r1 = 2.50;

void setup() {
  Serial.begin(115200);
}

void loop() {
float b1voltage=0;
float realbat=0;
float volbat1=0;

volbat1 = analogRead(34);
realbat= volbat1 * 3.3/4095;
b1voltage = realbat*r1;

Serial.print("bat1:  ");
Serial.println(b1voltage);
delay(2000);
}