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Lesson 13: Potentiometer Module

In this lesson, you’ll learn how to read the analog value of a potentiometer with the ESP32 development board. We’ll connect a potentiometer module to pin 25 and observe the changing analog values (0-4095) in the serial monitor. This project provides hands-on experience in understanding analog inputs and serial communication, making it an excellent exercise for beginners to explore the capabilities of the ESP32 board.

Required Components

In this project, we need the following components.

It’s definitely convenient to buy a whole kit, here’s the link:

Name	ITEMS IN THIS KIT	LINK
Universal Maker Sensor Kit	94	Universal Maker Sensor Kit

You can also buy them separately from the links below.

Component Introduction	Purchase Link
ESP32 & Development Board (ESP32 Board)	BUY
Potentiometer Module	BUY
Breadboard	BUY

Wiring

../_images/Lesson_13_Potentiometer_Module_esp32_bb.png

Code

Code Analysis

This line of code defines the pin number to which the potentiometer is connected on the ESP32 Development Board.
```
const int sensorPin = 25;
```
The setup() function is a special function in Arduino that is executed only once when the ESP32 Development Board is powered on or reset. In this project, the Serial.begin(9600) command initiates serial communication at a baud rate of 9600.
```
void setup() {
  Serial.begin(9600);
}
```
The loop() function is the main function where the program runs repeatedly. In this function, the analogRead() function reads the analog value from the potentiometer and prints it to the serial monitor using Serial.println(). The delay(50) command makes the program wait for 50 milliseconds before taking the next reading.
```
void loop() {
  Serial.println(analogRead(sensorPin));
  delay(50);
}
```