1  #define VOLTAGE_PIN 14
 2  #define REF_VOLTAGE 3.3
 3  #define ADC_RESOLUTION 4095
 4  
 5  
 6  void setup() {
 7    Serial.begin(115200);
 8    pinMode(VOLTAGE_PIN, INPUT);
 9  }
10  
11  void loop() {
12    int adcVal = analogRead(VOLTAGE_PIN);
13    float voltage = (adcVal/(float)ADC_RESOLUTION) * REF_VOLTAGE;
14    Serial.print("Voltage: ");
15    Serial.println(voltage);
16    Serial.println();
17    delay(1000);
18  }