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I'm looking for a device that can detect (and report to my raspberry pi) the presence of a signal from my Switcheroo:

Switcheroo - Sync Lights with No App, WiFi, Bluetooth, or Remote Control | Change Which Outlets Turn On/Off with Your Existing Light Switch | Smart Outlet Solution for Multiple Plug Switches (2-Pack) https://www.amazon.com/dp/B07BX6QF7Q/ref=cm_sw_r_cp_api_glt_i_PQZ4ATQ7S1BK81EQC2RS

I suspect that it transmits on the 915Mhz band. (The device designer stated in a Q&A that it operates at 900Mhz, but I assume he was just being imprecise - and I asked to confirm that assumption on the product listing.)

I guess I'm basically looking for a 915Mhz hub that can detect the signal and report its presence/absence to my Pi, so I can know when it turns on or off.

Incidentally, I'm really looking for an answer to this specific question and not some underlying question, because I like to tinker. I'm not looking for other ways to achieve something else.

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While you've said you're not looking for a general solution but you are probably going to end up using an SDR (Software Defined Radio).

While there are USB 915Mhz receivers (e.g. https://www.aliexpress.com/i/32378710247.html) they cost the same as basic receive only SDR capable hardware (https://www.nooelec.com/store/sdr/sdr-receivers/nesdr/nesdr-smart-sdr.html). The SDR approach also means that should the device not actually be 915Mhz the ability to chase the device round the spectrum will be easier. You are also more likely to find help from the SDR community in getting this all to work.

p.s. I'm not actively recommending any of the hardware linked, they are purely examples.

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  • Thanks for the leads. I will look into these.
    – hepcat72
    Feb 15 at 15:08
  • Do SDRs exist that pick up multiple channels at once? I plan to have 3 pairs of Switcheroos and it would be nice to have a single hub that reports on all 3. I'm guessing no, but thought I'd ask.
    – hepcat72
    Mar 12 at 13:51
  • They will all be on the same radio channel, just with device ids in the message so the SDR won't matter. And the fun thing about an SDR is they can basically listen to whole blocks of frequencies at the same time, due to how they work,
    – hardillb
    Mar 12 at 13:56
  • I'm trying to imagine how I would incorporate this into what I'm hoping to accomplish. I know virtually nothing about SDR (and not much about the Switcheroo signals/channels). I use an IR hub and a 433mhz transmitter/receiver with pilight, but only just to send codes. I haven't used my 433 receiver except to learn codes. I watched this: (youtu.be/7pgCC4cqgTc) to learn a bit. If all the switcheroo channels are just changing embedded codes on the same freq, can you refer me to a resource that can show me how to learn those codes and trigger things to happen when they appear/disappear?
    – hepcat72
    Mar 12 at 14:29
  • Are you sure the switcheroo "channels" are just changing embedded codes? Wouldn't 2 switcheroo transmitters being "on" (using different "channels") interfere with one another? I assume they're using on/off encoding, but I don't know. And I know from a bug I reported in pilight that mixed codes cause things to get scrambled, and the signals to not work.
    – hepcat72
    Mar 12 at 14:38

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