Sonoff TH Elite: 2x Ds18B20's?

[RandomRando]

Hey Folks.

So done a bit of searching but havent managed to find an answer to what im trying to do.

I have a sonoff TH 20A smart geyser monitor. My intention is to manage my geyser as I would with a normal TDGGT timer, but from my phone. In addition, i would like to monitor the water temperature.

However, if possible, I'd like to have 2 temp sensors: one on the cold inlet pipe and one in the thermo tube or flange plate for the hot water. Has anybody tried this? I read here that some has done this, but not with a sonoff device... ive also read online where 2 sensors can be joined in parallel as each sensors basically has a UID that the app registers and can distinguish between each. Even though they share the comms and power cables. Not sure on that, though.

I should add that I dont *need* the cold water inlet, it is purely to satisfy my own curiosity - a nice to have. If its not possible, then im ok with remote control, energy & temperature monitorig ( of hot water only) that the TH 20a provides.

TiA

 

[RoganDawes]

The main question is whether you are going to keep the Sonoff firmware? If you are, I'm not sure whether the Ewelink firmware can manage 2 different temperature sensors or not.

If you plan to change to something like ESPHome or Tasmota, I'm pretty sure that you can connect them all on a bus, and talk to each sensor individually.

 

[RandomRando]

The main question is whether you are going to keep the Sonoff firmware? If you are, I'm not sure whether the Ewelink firmware can manage 2 different temperature sensors or not.

If you plan to change to something like ESPHome or Tasmota, I'm pretty sure that you can connect them all on a bus, and talk to each sensor individually.

I wasnt intending on changing any firmware as i worry it might be beyond my reasonable limitations. If there are guides and walk-throughs, i might attempt it. Im looking for something relatively simple: download app, set up and monitor from there. If i need to start putting in coding, thats where things get blurry, although as i say, if there are walk-throughs and guides, i might attempt it.

I have some experience flashing and programming of AMI devices for inhouse smart kwh metering DCUs, so if its a simple 'erase and rewrite' a new program to the device for ESP home to work for example, then im interested in knowing more. I have no 'smarthome' experience at all though. So I would assume changing the software on the device is merely to download and use a more functional app to connect to it? Does this require particular cabling (usb to serial as an example)?

I have yet to buy my sensors and then install my sonoff, its still in a box somewhere that i need to unpack. Hence this post is to determine if im buying 1 or 2 sensors. I dont want to buy and add additional devices to the sonoff which i then add the sensors to - i.e a splitter / adaptor with two inputs that connects to my sonoff single input. If that's the only way to do it, I'll settle for a single sensor for hot water only.

I was planning to install the unit at my DB, inline with my geyser circuit like i would a normal timer. (Thus keeping the existing geyser controls and protections in place). Run an extended comms wire to the geyser for the sensors in parallel (if i can). Download app on phone, manage and set switch off temps and times, view load & temperature historys etc. Bobs your uncle.

From what i see, ewelink does all the above, with 1 sensor st least.

 

[RoganDawes]

Never actually used Ewelink. I did write up a project of mine which you might be interested in: https://mybroadband.co.za/forum/threads/esphome-geyserwise-smart-thermostat.1231463/

FWIW, I'm using only a single temperature sensor, and don't feel like I am missing out on anything. Then again, my sensor is right in the middle of the water, not just on the outlet.

 

[RandomRando]

Never actually used Ewelink. I did write up a project of mine which you might be interested in: https://mybroadband.co.za/forum/threads/esphome-geyserwise-smart-thermostat.1231463/

FWIW, I'm using only a single temperature sensor, and don't feel like I am missing out on anything. Then again, my sensor is right in the middle of the water, not just on the outlet.

Well i certainly don't have the means, equipment or knowledge for that. Definitely beyond my capabilities.

Props and max respect for that effort though, it seems it was a fair bit of trial and error. I recognize some of what you did from my smart metering experience, but a large chunk of it i do not, lol.

 

[krieg]

Hey Folks.

So done a bit of searching but havent managed to find an answer to what im trying to do.

I have a sonoff TH 20A smart geyser monitor. My intention is to manage my geyser as I would with a normal TDGGT timer, but from my phone. In addition, i would like to monitor the water temperature.

However, if possible, I'd like to have 2 temp sensors: one on the cold inlet pipe and one in the thermo tube or flange plate for the hot water. Has anybody tried this? I read here that some has done this, but not with a sonoff device... ive also read online where 2 sensors can be joined in parallel as each sensors basically has a UID that the app registers and can distinguish between each. Even though they share the comms and power cables. Not sure on that, though.

I should add that I dont *need* the cold water inlet, it is purely to satisfy my own curiosity - a nice to have. If its not possible, then im ok with remote control, energy & temperature monitorig ( of hot water only) that the TH 20a provides.

TiA

Less hassle to just have two Sonoffs.