DriverJoystickUsbWelcomeInterfacing Analog Joystick with AVR ATmega. NOTE To learn AVR Microcontrollers and do hands on experiments at home you can purchase x. Everything you need for your virtual cockpit, Sapce Ship, or Farm Tractor, from the latest X56 flight simulator systems,flight yokes to wheel and pedals sets for. This tutorial focuses on simplicity and easiness. If you want more details, please read the DIYUSBadapter page. Buy a ready to use GIMX adapter from the official. Joomla Job Portal Templates here. Board. It is a low cost development board designed to get started with minimum efforts and to easily perform common tasks. Lots of sample programs helps you easily complete projects. It is a must have tool if you want to do something real and instead of just wasting time just trying to achieve basic things and avoid problems that dont let you move forward to the real task. Buy x. Board NOW Once you have downloaded the installer, unzip it, and execute the. The installation begins with a standard welcome screen. Free shipping across India Pay Cash on Delivery Days Money Back If you have played games on console you must be knowing what a joystick is. In games a joystick is generally used to control the motion of character or a vehicle like plane or car. Joystick give a very realistic two dimensional control Joystick are also used to control the motion of real objects like a robot or a car. Generally we want to control the back and forth motion of any object along with the ability to make it turn left and right. For this we use a common joystick with two axis. The y axis is used to move the object forward and backward, while the x axis is used to turn the object left or right. The type of joystick we are using in this article is an Analog Joystick that means it can give the magnitude of motion along with the direction. For example you can push the joystick little forward to make you robot start moving forward slowly. You can push the joystick further up to increase the speed of forward motion faster. Similarly you can control the speed of robot while making a reverse motion. Turning magnitude can also be controlled in the same way by moving the joystick left or right. Fig. 1 An Analog Joystick. Working of Analog Joystick. Analog joystick has two variable resistor for two axis. Each variable resistor has three pins, two extreme pins are connected to Vcc5v in our case and ground. The center pin is the output pin. The output voltage is between Vcc and GND depending on the position of stick. By measuring the voltage output of two variable resister from which the joystick is built, we can determine the position of stick in x and y axis. Interface with AVR Micro. As told above the position of stick can be determined by measuring the voltage from the output of the two variable resistor of the joystick. This can be easily done by using the ADC of AVR Microcontroller. The output of the two variable resistor of the joystick are connected connected with the two channels of ADC. The measurement can be easily done by using our ADC librariess Read. ADC function. The return value is between 0 1. ADC reading. This finally gives us a value between 5. Read. ADC0 Read ADC Channel 0. Read. ADC1 Read ADC Channel 1. Joystick Wiring. The joystick is wired as described in the image below. The two extreme points or both the variable resistor are connected to Vcc and Ground respectively. While the central pin provide output, which is connected to ADC input channel. Fig. 2 Analog Joystick Wiring. Connect both the Vcc together and connect them to 5v out point of your development board. Similarly connect both the grounds and connect them to ground point of your board. Connect out x to ADC Channel 0, and out y to ADC Channel 1. The images below shows the Vcc, GND, ADC0 and ADC1 pins. Fig. 3 x. Board ADC Pins and Power Out Pins. Fig. 4 An Analog Joystick connected with x. Board v. 2. 0. Fig. Interface with AVRThe demo program reads the two axis of joystick and displays it in the LCD Module. The value range from 5. So attach an LCD Module as described in the x. Board Manual. Demo Program for Joystick Interface. The code is compiled using Atmel Studio 6 IDE. More information on using Atmel Studio 6. Joystick. Test. 1. Created 1. AM 1. 1 1. Author Avinash include lt avrio. Wait. fori0 ilt 6. Initialize LCD Module. LCDInitLSNONE. Initialize ADC Peripheral. Welcome Message. LCDWrite. String. XY0,0,Joystick Test. LCDWrite. String. XY0,1, Avinash. Read. ADC0 Read ADC Channel 0. Read. ADC1 Read ADC Channel 1. LCDWrite. String. XY0,0, Axis Data. LCDWrite. String. XY0,1,X Y. LCDWrite. Int. XY2,1,x,4. LCDWrite. Int. XY1. Schematic for Analog Joystick Interface. Fig. 6 ATmega. 32 Analog Joystick Interface Schematic. Important Note The program requires that the AVR MCU is clocked from an external 1. MHz crystal. Caution should be taken as this is NOT the default clock source of ATmega. You need to change the fuse bits to change the clock source from internal 1. MHz RC Oscillator to the external crystal. The fuse bytes to enable clocking by external crystal is LOW FUSE 0x. FFHIGH FUSE 0x. C9. Related Articles. This demo makes use of our LCD Library please see the following tutorial for more information on LCD Modules and the library functions. Troubleshooting. Downloads. Help Us We try to publish beginner friendly tutorials for latest subjects in embedded. If you like these tutorials and they have helped you. You can donate any amount. Credit or Debit Card or Paypal. We would be very thankful for your kind help. By. Avinash Gupta. Facebook. Follow on Twitter. Avinash. Gupta. com. Facing problem with your embedded, electronics or robotics project We are here to help Post a help request.