This project was used as a wireless light dimmer, but in principle can
be used to dim resistive loads and wirelessly turn on/off loads. The
current code includes a routine to dim a light bulb in a “heartbeat”
pattern, with the heartbeat frequency remotely adjustable.
The top left of the schematic shows the wall outlet (US 120VAC) being
stepped down with a small transformer, then full rectified and
regulated. This powers the entire board from the wall. The top right
shows a microcontroller, ATmega48, its programming header, and a UART
connection to the microcontroller (for debugging). The bottom right
shows the XBee and its basic voltage regulation (it’s 3.3V), as well as
an LED that indicates when the XBee is connected. [Link]
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