PCB Step 1: On and Off


Get power to the board and switch the main LED on and off.


  • Sliding toggle switch * 1
  • 9v battery snap * 1
  • 220 resistor * 1
  • Power indicator LED * 1



Double check to make sure you've got the correct LED color before soldering!

  1. Solder the sliding toggle switch to S21 on the back of the PCB. There's no polarity to this component, so either way is fine as long as it's on the back side.
  2. Feed the battery snap's wires through the relief hole above BAT, then solder its wires into place: red for + and black for -.
  3. Solder a 220 resistor to R81.
  4. Solder the LED to D21, making sure to match its outline.

It should look something like this when done#

It should look something like this when done


The components' brands and PCB/LED colors may look different from yours, and that's okay! What's important is that the part types and values are in the right spots.

Test it#

Connect your battery and slide the switch back and forth. You should see the LED turn on and off!

If you have the enclosure bottom handy, you can also try inserting the PCB into it. The switch should fit nicely into its cavity and be exposed on the other side, and the screw holes should align with their counterparts.