Stairway LED lighting with IR trip sensor

Step 3 Step 2: Wire your circuit

This is the pain in the butt step: you have to wire up the circuit. If you don't have the ability to etch (as I don't) you can cut off the female end of the PS/2 cable (you won't be needing it) and strip off a few inches, then cut out the small wires inside for runs between components. Follow the schematic as pictured. Optionally, you can add a low powered indicator LED in series with R5 for troubleshooting the circuit before you put it all in, but if you're a superchamp with circuit building I'm sure you won't need this. I've set this circuit to run for 11 seconds before shutting off, but if you'd like to make it run longer you can change the time by changing the values of R1 and C1 (for the first circuit, R2 and C4 for the second). The time delay (in seconds) is R1 * C1 * 1.1 so my circuit is 100,000 * .0001 * 1.1 = 11 second delay.