#define TX_PIN 21
#define RX_PIN 20
#define SENSOR_PIN 4   // Define the ADC pin (use a safe GPIO)
#define REF_VOLTAGE 3.3 // ESP32-C3 operates on 3.3V
#define ADC_RESOLUTION 4095 // 12-bit ADC resolution (0-4095)

float voltageDividerFactor = 4.3;  // Adjust based on the sensor calibration

void setup() {
    Serial.begin(115200);     
    Serial1.begin(9600, SERIAL_8N1, RX_PIN, TX_PIN); 


}

void loop() {
  int adcValue = analogRead(SENSOR_PIN);  // Read ADC value
  float voltage = (adcValue * REF_VOLTAGE) / ADC_RESOLUTION;  // Convert ADC to voltage
  float measuredVoltage = voltage * voltageDividerFactor; // Adjust based on sensor ratio

    Serial1.println(measuredVoltage); 
    Serial.print("Sent:measuredVoltage=");
    Serial.print(measuredVoltage);
   Serial.println("V");
    delay(1000);
}