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I’ve made a couple of further changes to the emon_DB_12CT firmware, feel free to upload this one now.
avrdb_firmware/emon_DB_12CT/emon_DB_12CT.ino at master · openenergymonitor/avrdb_firmware · GitHub

While I do have spare Pi Zero expansion PCB’s for the emonTx4 and Im more than happy to send you one, there were a couple of issues with that design that might make it more trouble than it’s worth. The Pi Zero needing a separate USB micro power supply being the main one as I made the mistake of not routing 5V to the expansion header.

How many temperature sensors do you need at the emonTx4 measurement point? The more straightforward solution is probably a USB powered EmonTH reading from multiple temperature sensors emonTH -Temperature & Humidity Node - Shop | OpenEnergyMonitor
The number of external temperature sensors can be specified in the firmware here emonth2/firmware/emonth2.ino at master · openenergymonitor/emonth2 · GitHub.

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You could always wire that from the other header on the reverse side.

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I think I will leave the TX4 alone and just add a PiZero with 1wire on the GPIO, then work out how to feed the values into EmonCMS.

I didn’t get to the FW last night I will have another run at it tomorrow and use the latest 12CT sketch.

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Alternative is an ESP - I have several of these using Tasmota to do the job. Up to 6 sensors on each one.

Install emonhub (and just emonhub not emoncms) onto the Pi.

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That’s much simpler, good idea! There are so many different ways to configure these things and sometimes a simpler solution like that is the best one. @borpin’s suggestion is also a good approach.

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@whitecitadel I’ve updated the documentation page for the emonTx4 6 CT expansion board with reference to the new firmware, please see: 6 CT Expansion board — OpenEnergyMonitor 0.0.1 documentation

I’ve also updated the page for emonTx4 expansion boards in general to highlight what made it to production vs development only Expansion boards — OpenEnergyMonitor 0.0.1 documentation

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I agree on the ESP but I could not find my spare ESP boards and I did find spare Pi Zero WiFi - thanks for the pointer on EmonHub not EmonCMS I will try that.