const int analogPin = 34;
void setup() { 
  Serial.begin(115200);  
  pinMode(analogPin, INPUT);  
} 
void loop() {  
  int analogValue = analogRead(analogPin); 
  float voltage = (analogValue * 3.3) / 4095.0; 
  
  Serial.print("Analog Value: "); 
  Serial.print(analogValue); 
  Serial.print(" -> Voltage: "); 
  Serial.println(voltage, 2); 
  delay(1000);  
}