Niklas Roy blogged about his DIY remote controlled beer crate:
The “remote controlled beer crate” is actually just a flat plywood platform on which standard sized beer crates can be placed. It is driven and steered by two windscreen wiper motors with direct attached casters. Two swivel casters in front stabilize the construction.
On its back, you can see the power switch on the left side and the digital voltmeter (for monitoring the charge of the battery) on the right side.
All the electronics are mounted below the platform: On the top leftt, you can see the 2-channel RC receiver board, which came from a cheap toy car. As the receiver can only drive small motors, it controls the big windscreen wiper motors via relais H-bridges. On the bottom of the picture is the LI-PO battery pack, which came from my neighbor’s broken RC helicopter.
More details at Niklas Roy project page.
Check out the video after the break.