Here a link for the Article: Building a wireless environment sensor capable of running for almost 2 years on a single CR2032
Intro
This article will discuss and demonstrate how to build a remote Temperature and Humidity sensor based on a Whisper Node (https://wisen.com.au/store/products/whisper-node-avr/) and a DHT11 (worst sensor ever, I know)., capable of running for well over a year on a single CR2032 coin-cell.
The remote node will be configured to transmit data every 60 seconds to another Whisper Node, acting as a gateway/base station and located 100 meters away. The data will be finally uploaded to a Google Could server running InfluxDB and Grafana to display the data.
This won't be a short 20 lines story! The information here will focus on low-power measurement and techniques, as well a detailed analysis of how much energy we really have available from a coin-cell.
This post will present many practical tests and some maths, sparing some common knowledge like: how to put your Arduino to sleep. All project details will be available though the source code.
continue at: https://www.hackster.io/Talk2/temp-and-humidity-sensor-with-a-cr2032-for-over-1-year-580114
