- Echo remote control was disassembled and power rails identified using a digital multi-meter.
- Tactile switch membrane was pulled back from the microphone/command contacts and a piece of wax paper was placed underneath in order to preserve the membrane's adhesive.
- Some wire-wrap wire was soldered onto the outer contact of the microphone/command switch after it was identified to be the one going to the main micro-controller on the back side of the board.
- Standard right-angle headers where used as SMD headers (since I ran out of actual SMD headers) where soldered onto the test pads in the back in order to supply power and ground to the controller board.
- Since the controller is powered with 2x AAA batteries, a 3v3 regulator was used to power the controller.
- Tactile switches connect the outer switch contact to a 1v8 rail, so we use a simple 1/2 voltage divider for the RPi's GPIO in order to trigger the switch safely.
- A script is used to toggle the RPi's GPIO HIGH and LOW before and after espeak reads out the voice command.
I wanna use it