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Arduino + PS2 shield + MDDS10 for mobile robot control

INTRODUCTION

Have you ever wish to build a simple mobile robot that can be controlled by a wireless PS2 controller? Thinking it’s too difficult for you? Think about it again. It’s actually easy and straight forward to build. In this tutorial, I will help you to build the robot step by step.

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HARDWARE REQUIRED

Okay, now we will start to build the body for the mobile robot. You can use your own creativity to design it, but you need to have all the 8 important items below to build the mobile robot. Please make sure your robot is stable. 🙂

STEP BY STEP PREPARATION

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First, I setup the robot base and a pair of DC geared motor together. To make it stable, I put the ball caster at the front base. After that I attached the MDDS10 at the top of the base.

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As you can see in the figure, there is a DIP switch in red box. The DIP switch is to setup the input mode for the MDDS10. For this robot, I choose to set the MDDS10 to PWM input mode with microcontroller (independent both). So, I have to set the DIP switch1, switch3, switch4 and switch6 to 1. Others will remain 0. Up is 1 and down is 0.

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After finished setting the DIP switch, now I just have to connect the motor to the motor port. Do connect your motor according to it position. left motor to the left port and right motor to the right port. Between the left and right port, there is power source port. Please connect the power source according to the polarity. There is no polarity protection for this MDDS10 board, so please extra caution!!

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The PS2 shield board consist of receiver(RX), transmitter(TX) and baudrate for UART communication. Based on the picture, I have set the TX to D3, RX to D2 and for the baudrate, I set it to 9.6K. All this configuration can be done by placing the jumper to the desired position. Please make sure that you download the library for the PS2 shield here and update your arduino library.

CIRCUIT DIAGRAM

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Now, I will show you how to connect the MDDS10 to PS2 shield. But before that, you have to stack the PS2 shield on CT UNO. 🙂 And configures some of the pins for communication pin.

  • DIG1 pin (MDDS10) connect to Digital pin 7 (Shield-PS2)
  • DIG2 pin connect to Digital pin 4
  • AN1 pin to Digital pin 6
  • AN2 pin to Digital pin 5 
  • +5V to 5V CT-UNO
  • GND to GND CT UNO

Now I have completed the hardware setup of my robot. Next, I will explain on the software part.

CODE OVERVIEW

In this sample source code, I just use Left joystick and Left2 button. If Left2 button is pushed, it will go Acceleration(); function. In the Acceleration() function, the speed is higher compared to Normal() function.

[code]
void loop()
{
//joystick value
ly=ps2.readButton(PS2_JOYSTICK_LEFT_Y_AXIS);
lx=ps2.readButton(PS2_JOYSTICK_LEFT_X_AXIS);
acc=(ps2.readButton(PS2_LEFT_2) == 0);
if(acc==HIGH)
{ Normal();}
else
{ Acceleration();}
Movement();
}
[/code]

VIDEO

In English:

In Malay language

Thank you for reading and watching the video. I hope you understand my tutorial. 

ATTACHMENT

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3 thoughts on “Arduino + PS2 shield + MDDS10 for mobile robot control

  1. Hi guys; I love the mdds10 and the ps2 shield. Got everything hooked up and it works, except I cannot turn to the left. I have tired everything I can think of but nothing works. It works fine forward, reverse and right, just not left. the board is not even receiving a signal. any ideas what might be causing this? I have even switched from left to right joystick and still no right turn. Any help would be greatly appreciated.

    Bill

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