Introduction: Easy Analog Joystick Calibration and Centering
If you ever tried to control something with a joystick on Arduino you'll probably have noticed that the joysticks are not centered and calibrated. To solve this problem can be a real pain. To make it easier for you to control something with a joystick, I made this instructable. I will show you how to connect, calibrate and use your joysticks the easy and correct way.
Step 1: Stuff You Need
- Arduino with USB cable and PC
- analog joystick with optional push button
- some dupont wires
- Arduino IDE
Step 2: Connecting the Joysticks
Connect the joystick(s) to the Arduino like this:
- vcc --- 5V (or 3V3 on 3V3 boards)
- GND --- GND
- X --- analog 0 (any analog pin)
- Y --- analog 1 (any analog pin)
- switch --- digital 2 (any digital pin)
You can connect the X and Y to any analog input as long as you define the X and Y pin. You don't have to connect the switch to use the joystick.
Although almost everyone tells you to connect buttons using a pull-up resistor, you don't have to connect the button using a pull-up. Just connect the button to any digital pin. We are using the build-in pull-up resistor on the Arduino to pull the signal up by default.
Step 3: Uploading the Sketch and Defining Pins
Download the sketch which is included in this step and open it.
Define the pins for the joysticks or leave them as default when connected to A0 and A1
upload the code and follow the instructions on the serial monitor to calibrate your joystick
Step 4: Calibrating
Calibrating joysticks is really easy with this code, all you have to do is center the joystick , push it to the bottom left and to the top right corner. The joystick takes 100 readings in each position and calculates the average value and offset. The code does also recognize the joystick limits being less than 0 or 1024 and creates new limits, this way you can still use the range of 0-1024. if you hold the joystick half way the limit you can even make it give values of over 1024 or below 0.
An other feature is the possibility to invert the axis, to do this, just push it to the top right corner when asked to go to the bottom left(or top left if you only want to invert the Y axis)
If this code is popular, I will add the possibility to add more joysticks and other useful options like EEPROM storage for the calibration values so you don't need to calibrate each time you restart your code. If this code becomes really popular, I'll make a library for it for even better support and updates. If you have a nice idea or improvement please leave a comment