Wiring the Somfy Telis 4

The Somfy Telis 4 remote has 4 buttons (not inclusing the reset button on the back) and 4 LEDs to indicate the channel.

The buttons

Each button is wired to GND with the two pins on the left side of the button. When the button is pressed, the two pins on the right also get GND. To operate the buttons without physically pressing them: just wire the GND to one of the two pins on the right side of the button. We need to solder 5 wires to the board to have the Arduino control the remote (in the diagram: GND, UP, STOP, DOWN, SELECT)

The LEDs

Each LED is wired to +3V and to the circuit on the board. To let the Arduino know which channel is selected, we are going to measure the voltage between GND and the points marked with LED x. When the LED is not blinking it will read +3V, but when the LED is blinking it will drop to about 1.39V and the LED takes 1.91V.
We need to solder 5 wires to the board (in the diagram: +3V, LED1, LED2, LED3, LED4).

Wiring

I took an old IDE computer cable that I had lying around for the wiring. I removed the battery from the remote, because it will be powered from the +3.3V output on the Arduino. See the final result below.