This is an Arduino powered servo bot I designed for an engineering summer camp
Print the chassis and wheels on your favorite 3d printer. No Support needed for this design.
Once printed, press a std sized marble in the hole to act as a third wheel for the bot.
The marble does not need to spin because the glass is slippery enough to not cause any issues.
Order the above referenced O ring to act as tire tread for your robot. Be sure to install the servos with the output shafts towards the rear of the chassis.
Take note of the breadboard placement along with the the 9v battery placement which runs the Arduino. The 4AA holder is used to power the servos only.
I have attached the basic code to get this robot to drive forward until a certain distance, backup turn and continue on its way.
You will also need a couple 9v battery clips to get the power to the board.
I used ranger finder HC-SR04.
You can use an continuous rotation std sized servo for the motors.
The code also has an output for a 2 status leds.