You can add a number of difference sensors to the Sonoff devices. This document will describe how to add a DS18B20 temperature sensor.
The DS18B20 1-Wire digital temperature sensor from Maxim IC reports degrees C with 9 to 12-bit precision, -55C to 125C (+/-0.5C). Each sensor has a unique 64-Bit Serial number etched into it - allows for a huge number of sensors to be used on one data bus.
Wiring the DS18B20
References
| Reference | URL |
|---|---|
| Temperature Sensor - DS18B20 | Temperature Sensor - DS18B20 |
| Sonoff Basic | |