Computing stuff tied to the physical world

Control via 433 MHz

In AVR on Jan 17, 2009 at 12:00

I’ve rewired and adjusted an earlier unit so it now receives and sends pulses on the 433 MHz band:

IMG_2984.jpg

Both receiver and transmitter have been verified to work with the KlikAanKlikUit system, which is cheap but also quite limited. There are at most 12 codes in the simplest units and 256 codes in a slightly more elaborate version.

Both versions could be triggered by neighbors with similar units. And just as with IR remote controls for A/V equipment, it’s trivial to record and replay these signals so they provide no security. But for basic stuff such as turning on lamps it should be ok. And fun!