Variable Resistance Challenge
Make a pressure sensor using anti-static foam, which comes with most IC chips. Put a chunk of the anti-static foam between two pennies, and solder wires to the outsides of the pennies. Wrap the whole thing in electrical tape to keep it together.
1. Test your pressure sensor by measuring the resistance values you get under different pressures, using a VOM.
2. Hook up the pressure sensor to a Lego RCX, which drives a robot car. Write and run a program that allows the user to squeeze the pressure sensor to determine the car's forward speed.
3. Hook up the pressure sensor to a BASIC Stamp, using an RC circuit. Hook up a 7 segment LED display. Write and run a program that outputs the sensor's pressure on a realative scale from 0-9 on the LED display.