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The bathroom light was commonly left on in the new space. This is ungreen, so a solution to this was desired. The following criteria were desired:
- No interference with the existing wiring
- No drilling in the walls
- Some means of reporting out the presence/absence of someone using the bathroom (for future expansion)
An old motion sensor was present already in the space, so with a bit of screwdriver work and an old wall-wart, a 12V supply for it was found. Also available was an unused servo. This presented the opportunity to place the servo over the light switch and allow for human override.
A protoboard arduino-clone was designed and developed and coded to turn off the light after 10 minutes of no activity. It was originally designed to output a serial line, however this seemed to cause the chip to become buggy, so a simple high signal is generated on motion detection. It is voltage divided down to allow for connection to a Raspberry Pi.
The board was to be positioned a long way from the switch, so a servo extension cable was bashed up using some Sugru to insulate the plugs neatly.
It might not be a good idea to do this yourself, but the low power use on the servo allowed this long cable to work fine here.