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Lesson 09: Joystick Module

In this lesson, you will learn how to read values from a joystick module using the ESP32 Development Board. We’ll cover measuring the X and Y axis movements of the joystick and interpreting the switch position. By integrating these inputs with the ESP32, you’ll gain insights into handling analog and digital signals. This project is perfect for beginners, providing hands-on experience in reading and processing data from interactive hardware components.

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
Joystick Module	BUY
Breadboard	BUY

Wiring

Code

Code Analysis

1. Pin Definitions:

   const int xPin = 27;  //the VRX attach to
   const int yPin = 26;  //the VRY attach to
   const int swPin = 25;  //the SW attach to
   

   Constants for the joystick pins are defined. xPin and yPin are analog pins for the joystick’s X and Y axes. swPin is a digital pin for the joystick’s switch.

2. Setup Function:

   void setup() {
     pinMode(swPin, INPUT_PULLUP);
     Serial.begin(9600);
   }
   

   Initializes swPin as an input with a pull-up resistor, essential for the switch’s functionality. Starts serial communication at 9600 baud.

3. Main Loop:

   void loop() {
     Serial.print("X: ");
     Serial.print(analogRead(xPin));  // print the value of VRX
     Serial.print("|Y: ");
     Serial.print(analogRead(yPin));  // print the value of VRY
     Serial.print("|Z: ");
     Serial.println(digitalRead(swPin));  // print the value of SW
     delay(50);
   }
   

   Continuously reads and prints the values from the joystick’s axes and switch to the Serial Monitor, with a delay of 50 ms between readings.