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Step 2 Prepare the Control Center

From my testing it appears the Control Center sends roughly 3.3 volts to each LED continuously on the anode and then sinks the current on the cathode when it wants to light up the LED. To read the state of the LED we will connect a wire to the anode and monitor it using an Analog pin on the Arduino. When the LED is not lit we will read about 3.3v and when it is lit we will read little < 0.5v or no voltage as the current sinks through the LED.

Once the case is opened we need to solder 7 wires onto the Control Center circuit board. 1 wire for each of the 6 LEDS and 1 for  ground. For the LEDs we are going to solder the wires onto the pin of each LED that is farthest away from the edge of the circuit board. Be careful not to bridge the connection between the two pins when soldering. For the ground we will need to flip the board over and solder it to the outer pin of the barrel jack.

Try to keep the wires as short as possible and route them along the edge of the board to the side with the antenna. After soldering, drill a hole through the back of the case and feed the cable through as shown.

It's helpful to write down which wire is connected to which LED.

Note: The white residue on the board was present from the factory.