LED Rainbow - RGB LED PWM Controller Construction - Easy To Build

Step 13 Assembly Step 10: Install LED Rainbow Controller

The final step in the assembly of the board is to insert the LED Rainbow controller into the socket at U2. The controller must be placed into the socket with Pin 1 facing upwards. Pin 1 is identified on the chip by a small indentation on the chip in the corner - this is used to signify Pin 1. If you insert the processor is backwards and apply power, you run a good chance of damaging the processor. You can now install the controller at U2.