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Thread: Automation: intercepting data from Acu-Rite wireless sensors

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    robstar's Avatar
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    Automation: intercepting data from Acu-Rite wireless sensors

    Hi! I have an AcuRite 00617 floating wireless thermometer. It works (though the floater leaks and could use some add'l sealing) but i'd like to capture the data for computer monitoring/analysis/control.

    I'm able to read a signal off the 3.3V data pin on the receiver unit, but i'm having trouble decoding it. AcuRite is not interested in helping, but i'm sure we can do it.

    If anyone else is interested, let's chat.
    ~15kgal IG plaster, hayward cartridge filter, old-ish pool, TF-100 test kit

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    Mod Squad JohnT's Avatar
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    Re: Automation: intercepting data from Acu-Rite wireless sensors

    I've done something very similar with a very similar data stream.

    The diagram for the RF-211 is just showing you that the period of the signal is constant and that the positive pulse width is what determines the value of the bit. I've seen this kind of encoding before.

    Often there are unused bits in the stream, and if you can flush out the unchanging bits early on you can concentrate on figuring out the ones that do change.

    Have you thought about using a variable power supply and changing it to see if you can identify the bits that carry battery status?

    If you have the hardware, I've had much more success working the problem from the other direction. Now that you know the format of the data word, using a sound card or I/O card to modulate an RF source and sending test words to the receiver may let you progress faster. You can change bits and see the response (or lack thereof) on the display immediately. I wrote code to allow me to change the bits and send the data, and had much better success than trying to just figure the encoding out.
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    robstar's Avatar
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    Re: Automation: intercepting data from Acu-Rite wireless sensors

    Quote Originally Posted by JohnT View Post
    Have you thought about using a variable power supply and changing it to see if you can identify the bits that carry battery status?

    If you have the hardware, I've had much more success working the problem from the other direction. Now that you know the format of the data word, using a sound card or I/O card to modulate an RF source and sending test words to the receiver may let you progress faster. You can change bits and see the response (or lack thereof) on the display immediately. I wrote code to allow me to change the bits and send the data, and had much better success than trying to just figure the encoding out.
    Great ideas! Will try!
    ~15kgal IG plaster, hayward cartridge filter, old-ish pool, TF-100 test kit

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    cws91's Avatar
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    Re: Automation: intercepting data from Acu-Rite wireless sensors

    No input on your issue but I've had 3 of those over the past few years. When they work they're great but I find the lifespan to be maybe 6 months. I've seen other brands on amazon. Anyone have any comments/recommendations on other brand wireless thermometers?
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    Re: Automation: intercepting data from Acu-Rite wireless sensors

    I'm not making progress on this, so in the meantime, i've made my own sensor. (Adafruit HUZZAH (ESP8266) + LM35 + 4xAA)
    ~15kgal IG plaster, hayward cartridge filter, old-ish pool, TF-100 test kit

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    robstar's Avatar
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    ~15kgal IG plaster, hayward cartridge filter, old-ish pool, TF-100 test kit

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