Keyboard - 12 sensors, 1 input

This keyboard gets around the RCX's limitations by putting all the buttons and resistors in parallel. As long as only one button is pressed at once, and the resistor values are spread far enough apart, then it works great. The buttons are read as analog inputs instead of binary inputs.

Resistors Used:

• 680 Ohms
• 1.2 KOhms
• 2.2 KOhms
• 3.3 KOhms
• 4.7 KOhms
• 5.6 KOhms
• 6.8 KOhms
• 8 KOhms
• 10 KOhms
• 15 KOhms
• 22 KOhms
• 33 KOhms