Sonoff TH10 Dual Sensor Modification

    I wanted a second temperature sensor on my Sonoff TH10. I had read the blog post from Xose "Tinkerman" Pérez and decided to set about modifying my switch.


    I was dismayed to find that the board in my device was neither of the two he discusses. I don't know what the version is of Tinkerman's board, but mine says Ver 2.1 2018-06-15

    Surprisingly, I think the schematic is the same as the circuit on the Sonoff Wiki. IN any case, it turns out the 2.5mm jack socket has GPIO4 and GPIO14 exposed already.

    I reckon Sonoff were going to market a "cheap" version which only worked with a single one-wire sensor and an "expensive" version which would work with two wire devices and they've ditched the idea and just fully populated the board.
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    Anyway, my sensors are the Sonoff Si7021 type, which are a one-wire device. I've reflashed my device with TASMOTA which already supports a second temperature sensor on GPIO14.

    I got the sensor pinout from the ITEAD Wiki and started looking at my options. I Could make a Y-splitter cable which takes the GPIO lines from the second ring and tip and passes them straight through to one socket, but crosses them over for a second socket.

    The less expensive option, though, was to buy a 2.5mm 4 pole jack socket and piggy-back onto the existing jack.

    Sonoff TH10
    In the factory TH10 device,  
    • Screen = +3.3V
    • First ring = Gnd
    • Second ring = GPIO4
    • Tip = GPIO14
    On the Si7021 sensor, 
    • Screen = +3.3V
    • First ring = Gnd
    • Second ring = no connection
    • Tip = GPIO14
    So, for my secondary jack socket, I have wired GPIO4 out to the tip. This allows me to select a second temperature sensor in the TASMOTA interface. The sensor doesn't contain the wire to the second ring, so there can be no interference.

    In TASMOTA, configuring to have a second temperature sensor is straightforward and requires no software modifications. I've gone Main / Configuration / Configure Module and selected Si7021 as the GPIO4 temperature sensor. The Configure Module and Main screens now look like this:


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