I've built some fast pinewood derby cars in the past but this year was just about looking good. I've always loved the way those lowriders bounce and thought it would be cool to make a derby car do that. Here's my version. A few more pictures and build details after the jump.
Here's the first iteration of 'Scout'. A simple printable frame for a robot based on two continuous rotation servos and an Arduino.
The idea was to limit the number of printable parts and 'vitamins' to the bare minimum and keep the total cost for the bot below $50. I'll use this to teach the robotics merit badge in December. Here's how the costs breaks down:
- 2 Futaba S3003 servos or equivalent (modified for continuous rotation). $4.50 each. I found deals on ebay to buy sets of 4 for $16 with no shipping.
- 1 arduino diecimila. $20 - 25. Also an ebay deal. A nano may work better. I'm still looking into this.
- 3 o-rings for tires. $3.00. Might be possible to replace these with rubber bands.
- 9V battery