Jar of Fireflies

Step 12 Attaching LED Strings to the Board - Part 2 of 2

Bundle the green wires into 2-wire bundles and solder to the board, test -

Using a similar process to how you made the red 3-wire bundles, join the green wires together into 2-wire bundles and solder them to PIN_C, PIN_D, and PIN_E. By not soldering the bundles to the pad closest to the microcontroller, we give ourselves more elbow room should we need to do any touchup soldering work on the microcontroller or attach a programming clip to the board.

Once all the LED strings have been soldered to the board, it's a good idea to test them. With a 3V power source, test the strings by placing a positive voltage on either PIN_A or PIN_B, being careful to place it *behind* the resistor since 3V will damage these LED's without it, and moving the negative voltage between PIN_C, PIN_D, and PIN_E. Each combination of pins should result in a LED lighting up when probed.

(if your chip happens to be already programmed at this point then simply applying power to the board (VCC and GND) should be enough to test all six LED's in one go. The provided program cycles through all the LED's on boot.)