I used two water bottles, polymorph plastic, two motors and propellers, tape, a box, a battery and a motoruino (Arduino clone designed to work with motors, servos and sensors).
Step 1: Materials needed:
- Two water bottles
- Two simple dc motors
- Two propellers
- Isolating tape
- Motoruino (or any other microcontroller and a h-bridge)
Step 2: Add the motor and the propeller to each bottle
- Take out the bottle cap and insert the motor on its mouth (you can use some insulating tape if you see that there is space between the motor and the plastic).
Use polymorph to seal the bottle. If this is the first time you're using this material you may find these tutorials helpful:
- Attach the propeller
Step 3: Connect the two bottles
Step 4: Make the electrical connections
I used a SFR05 sonar, if you use it too, check this example: http://www.robot-electronics.co.uk/htm/arduino_examples.htm#SRF05 Ultrasonic Ranger