Mod of the Roto / Becker Electronic Radio-Controlled Wall Transmitter EC411 / Homematic / AskSin
thingiverse
The idea came up while reading this posting: https://forum.fhem.de/index.php/topic,12772.msg1049402.html#msg1049402 As the Roto / Becker Electronic Radio-Controlled Wall Transmitter EC411 only uses a coin cell for power supply and has a very compact housing I decided to design a housing which is capable to include 2 AA batteries and the Homematic add-on board.
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