Cheap Asda USB charger + Sensor node



  • So I got one of these things from asda a while back.

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    I opened it up and there was plenty of space for 'things' inside. So I connected a 3.3v regulator to the USB circuit to power a pro mini. On that, I am running the example humidity sensor sketch with repeater mode enabled. Connected to that is a DHT22. I cut a hole in the side for that to poke out of. I also managed to get the pro mini and NRF quite well stuck together. Compact is probably the word i'm after:

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    I tried to keep this away from the high voltage side as best I could. The gap I managed to stuff the pro mini + NRF into is a insulated area, so perfect! I am quite pleased with it.

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    It did just occur to me though.... the DHT could pick up heat from the USB circuit inside. I'm not sure if it runs warm when in use. I suppose I will find out.


  • Hero Member

    Hi @thazlett144
    ..sounds good... and probably looks good ( but i cannot see the images in your post?!? ) - Can anyone else see them?

    I think you will indeed find that the temperature is off due to the heat generated by the supply... perhaps put the sensor on a short cable ( which wont be as tidy :-(

    If you do put the dht on a cable, be really careful as you may not have the level of isolation you need!!!

    Perhaps, forget the dht, and install a PIR sensor instead. ?



  • Fixed the images. Apologies.

    PIR was what I was thinking doing next. Perhaps more useful. There is not much room for it though.



  • So I got another one of these and made a motion sensor version :-)
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    I was thinking about making a multi sensor version of this. I have the sketches for many combinations of multi sensor sketches I have mashed together.


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