I've got a large'ish Evohome system and have recently acquired an RFG100 as part of a box of bits, can it be used for anything useful (such as monitoring)?
Rfg100
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Oh, this is pretty interesting. Does the hack destroy the original functionality? Would be nice if it's a simple job of attaching wires to measuring points on the board. Even better if you could also send commands through that serial connection.
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You won't be able to send commands easily because the current MCU on the RFG100 is connected to the radio chip. But you can sniff the data that is has been picked up by the radio as valid on its way to the MCU on board.
It's a fun project. However its not a cost effective one. These parts are all pretty cheap and you can make a fully functional HGI80 for about a tenner these days.
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