Wireless relay control of relays

Gareth Branwyn says: "In this adafruit video, Limor demonstrates how to set up Xbee modules to wirelessly control both standard-type and latching relays."


  1. I love this stuff! Even if I never get around to using that particular thing, I enjoy thinking about what some tinkerer somewhere is developing. Makes we wish I were twelve again.

  2. you never had the joy of discovery as a child of things actually WORKING? It turns into quiet satisfaction as an adult – no where near as good.

  3. Don’t forget to put a diode across the windings of the relay to prevent the back emf from blowing out the solid state components when the relay de-energizes.


  4. First, I am _SO_ glad they showed the cat at the end. I thought a certain substance was adversely affecting my perception.

    Second, first time I’ve heard of a latching relay, and I’m in love. Perfect device for battery operated do-dads. And best of all, they are immune to power loss. It’s like a 1-bit flash memory cell, only it can connect to line voltage.

    Third, some relays have the diode built-in across the coil. Might save room in the final project.

  5. ♥♥♥
    Limor completely rocks my world.
    I have a buddy coming round in few moments to assist with transistor matching so I can start my x0xb0x.

  6. You can find solid state relays for cheap these days… If you can’t find one that’s “latching”, you can always use a flip-flop to make it latch.

  7. Limor is completely hot.

    @Takuan – You should check out her site, she has some very easy to assemble kits (just basic soldering) that do cool things, like the tv b gone. Satisfying to assemble, and fun to impress friends with. An her arduino kit is, i think, the best one out there.

    I’m using her wave shield in a project now, and read about the wave bubble for additional coolness outside my reach.


  8. @1,3 Taukuan:

    I’m not saying What?! to you, but to the post itself. I don’t understand a word of it! MY childhood discoveries were not of this order.

  9. So, what’s the difference between a latching relay and a regular one? So long as it’s at least DPDT (AFAIK they all are) then you can make any relay a latching one…

    PS: For the first time ever I’ve failed the captcha… Both words were unintelligible, so I gave my best guess for each. I was told I failed the turing test and was booted back to the original posting, my text was cleared from the textbox. Someone might want to look into this at some point… Were I not a random useless anonymous poster my suggestions might carry more weight, but really, I’d have hoped it would at least preserve my entry instead of eating my text.

  10. XBee works on 2.4 GHz. I assume this is the 2.4 GHz ISM band which is also used by WiFi. Any ideas on how/if XBee plays nicely with WiFi?

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