This is my entry for the National Robotics Week Robot Challenge. I am in the 13 to 18 year old category.
Step 1: Materials
A motor or servo (if you choose to use a motor, you will need the L293D Motor driver)
Picaxe 28X1 board and chip (this can be done with other microcontrollers, but I am using this one)
A computer (Mac or PC, doesn't matter since the code will be on the board itself)
AXEPad (Programming software for Picaxe, can be found for Mac OSX, Windows, and Linux)
NOTE: you will need a soldering iron and solder for this.
Step 2: Hooking Up the Servo/motor
If you wish to use a motor, you solder a wire into each of the holes for motor A or motor B, then you solder them to your motor.
You also need to install the motor driver as outlined in the photo
Step 3: Programming
SerTxd( "You typed ", b0, CR, LF )
if b0 = "o" then 'the o can be changed to whatever letter you want (in this case o≠O, so you have twice as many options)
servo 0,75 'this should be replaced by the motor command if you use a motor instead, It is high 4, low 5, or high 5, low 4 for one of them, or high 6, low 7, or high 7, low 6 for the other.
wait 2 'this command is specifically for the servo, otherwise it will not turn all the way
if b0="i" then 'again, this can be changed to suit your preferences and i≠I
servo 0,225 'If you use a motor, switch the high and low values
wait 2 'again, you don't need this if you are using a motor
if b0 = "p" then
servo 0, 150 'this centers the servo, put all values on low to stop the motor
Press f4, or go to PICAXE>check syntax to make sure everything is entered correctly, then press f5, or go to PICAXE>program to download the program to the board
Step 4: Dynamic Control
type o then press send and the servo/motor will spin in one direction
type i then press send and the servo/motor will spin in the other direction
type p then press send and the servo/motor will stop