Some notes how to build a sensor that can be driven by 3 AA rechargeable battries for up to 1 year.

Overview

The web is full of examples how to build a temperature sensor. I want a sensor that is connected to my Wifi, can be driven by batteries for months and has an adequate resolution and precision.

This leads me to the following parts:

• ESP-01
• DHT 22
• MCP1700
• 3 AA rechargeable batteries, should be ‘ready-to-use’ (see below why)