Research Design Lab

                                                                      

EXPERIMENT NO 7 

ADC 

Aim: 

To Interface ADC with ESP 32- Microcontroller Module. 

Description: 

To learn how to read ADC values using ESP32-Microcontroller. 

Hardware required: 

ESP32-Microcontroller Development board and FRC Cable.

Procedure: 

1. Connect P1 port and SV12(ADC & Temp) port using FRC cable as shown above. 

2. Connect the USB cable to the board. 

3. Open Arduino IDE .Select DOIT ESP32 DEVKIT V1 in boards and select COM port. 

4. Write the program, verify and Upload it. 

5. Open the serial monitor to observe the output.

Program:

const int adc1=34;

const int adc2=35;

const int adc3=32;

int value1=0, value2=0, value3=0;

float res1=0, res2=0, res3=0;

 

void setup() {

  Serial.begin(115200);

  pinMode(adc1, INPUT);    // Pins Port1 Connected to ADC Knobs

  pinMode(adc2, INPUT);

  pinMode(adc3, INPUT);

  delay(500);

 

}

 

void loop() {

  delay(1000);

  value1=analogRead(adc1);

  value2=analogRead(adc2);

  value3=analogRead(adc3);

 

  res1=float((value1*3.3)/4095);   //3.3v is maximum voltage applied as a input

  res2=float((value2*3.3)/4095);   //it is 12bit ADC hence dividing by 4095 gives actual voltage

  res3=float((value3*3.3)/4095);

 

 Serial.print("The output of ADC1= ");

 Serial.print(res1);

 delay(500);

 

 Serial.print("\t The output of ADC2= ");

 Serial.print(res2);

 delay(500);

 

 Serial.print("\t The output of ADC3= ");

 Serial.println(res3);

 delay(500);

}