Pinter75: Robotics: Brighton Robotics Hack Night!

Overview
For the 1st Brighton Robotics Hack Night, I am going to show you how to build a really simple and cheap Arduino based robo platform! This bot is great because you will learn how to hack together a mechanical base, do some easy breadboard electronics, add some sensors and write some code to get it all working :-)

Video

What will it cost?
I have tracked down everything needed to make these bots. Unfortunately, the servos needed have been hit by the Ł/$ rate and are now Ł8.95 each! This has pushed the cost of the kit up.
I will be posting the costs involved here, one for those of you who already have an Arduino, and for those needing one OEM, or Cheaper Clone.

Software
You will be using the Arduino IDE version 12 or 13. I will be bringing a laptop and usb cable, but you can always bring your own.

Code
Here is the current Arduino code.

// A simple object detection routine using microswitches and continuious drive Servos.

#include <Servo.h>

Servo rightServo;  // create servo object to control a servo
Servo leftServo;  // create servo object to control a servo

int r_inPin = 2;   // Input pin for right bump switch
int l_inPin = 3;   // Input pin for left bump switch
int r_val = 0;     // Variable for the right bump sensor pin status
int l_val = 0;     // Variable for the left bump sensor pin status
long randNumber;

void setup() {
  pinMode(r_inPin, INPUT);    // declare right microswitch as input
  pinMode(l_inPin, INPUT);    // declare left microswitch as input
  rightServo.attach(10);  // attaches the right servo on pin 9 to the servo object 
  leftServo.attach(9);  // attaches the left servo on pin 10 to the servo object 
}

void loop()
  
{
  randNumber = random(100, 1000); // Generate a random number for the turn delay
  r_val = digitalRead(r_inPin);  // read right input value
  if (r_val == LOW) {         // check if the right input is HIGH
    goForward();
  } else {
    goBack();
    delay(randNumber);
    goRight();
    delay(randNumber);
 
  }
   l_val = digitalRead(l_inPin);  // read left input value
  if (l_val == LOW) {         // check if the left input is HIGH
    goForward();
  } else {
    goBack();
    delay(randNumber);
   goLeft();
    delay(randNumber);
  }
}

//forwards
void goForward(){
 leftServo.write(50);
 rightServo.write(110);
}

//backwards
void goBack(){
 leftServo.write(110);
 rightServo.write(50);
}

//right

void goRight(){
 leftServo.write(50);
 rightServo.write(50);
}

//left
void goLeft(){
 leftServo.write(110);
 rightServo.write(110);
}

//stop
void goStop(){
 leftServo.write(90);
 rightServo.write(90);
}

Images
Here are the images relating to the project.