I am working on automating my Somfy Blinds. The idea is to avoid using the remote control which works on 433.42 Mhz and use a simple RF transmitter and an Arduino.
The thing is that I can not find any transceiver at such frequency. I only can get RF 433.92 Mhz transceiver like RFM69 @ 433 MHz among others that only mention 433 Mhz without precision.
I read from other projects that this will work just fine for short distances, let's say 5-10m.
So before buying a module that won't work I just wanted to drop the question here for the expert
Electronic – arduino – Can a RF 433.92 Mhz transceiver communicate to a RF 433.42 Mhz Receiver
433mhzarduinoremote controlRFtransmitter
Best Answer
A 500 KHz offset frequency would be substantially weakened by the filter of a decent OOK receiver at these frequencies, however, some lower cost appliances may use fairly wide receivers.
But that is really beside the point here, as the RFM69 is not a fixed frequency radio, rather it is configurable to a range of frequencies and modulation types, including the ~433.4 MHz or therabouts OOK used by a Somfy shade. So the premise of the question comes only from misunderstanding, and is moot.
Still, your task is not that simple either, as Somfy shades use a rolling code scheme. You will not be able to control one without transmitting a code which changes at each transmission in accordance with that scheme, and pairing your code sequence to the shade receiver.