Main Content

Battery operated thermometer with connection to BLYNK

self-sufficient with battery operation and multi-wifi support

This device measures the temperature and is self-sufficient from a power supply. It uses a rechargeable battery with 1.100 mAh and 3.7V. With the deep sleep modus of the WEMOS mini it can sustain operation for a period of 10 days.

The WEMOS Mini, the DS 18B20 and the battery shield are attached on a dual shield. In order to be able to measure the voltage, it is necessary to attach a 100 kilo ohm resistor between the positive pole and the input a0 on the battery shield.”

Link to article