Temperature sensors using WeMos

After trying for a few months to get mysensors working on a Arduino mini pro with a NRF24L01+ I eventually gave up as the radio was too unstable. Works fine one day and next it loses communication. I tried all the tips and tricks to get these devices stable but had no luck. I now have a drawer full of them gathering dust.

There are loads of posts on various forums with various issues on the NRF24L01+

Next I tried a WeMOS D1 Mini Pro  which has a built in ESP8266 wifi module. This works great. I’ve now got 6 temperature sensors running and have they have been stable for 2 months so far.


The WeMOS is dirty cheap. You can find them all over eBay for $3-$4 with free shipping. They are stable, coding on them is really easy and there are plenty of examples of code on GitHub.

Description: The D1 mini is a mini wifi board based on ESP-8266EX.


  • 11 digital input/output pins, all pins have interrupt/pwm/I2C/one-wire supported(except D0)
  • 1 analog input(3.2V max input)
  • a Micro USB connection

The great thing is you can use the ArduinoIDE to program the WeMOS which makes it really simple.

I had a DS18B20 temperature sensor connected and up and running in no time.

To log the data I’ve setup Domotitz on a spare Raspberry Pi and the WeMOS sens the temperate to Domoticz via HTTP calls.


See my code on Github for my water sensor which words on the same principle as the temperature sensors.


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