This project is to create a low powered temperature and humidity sensor. It is hoped to achieve ~9 months life from either a small LiPo battery or a good time with a couple of AAA cells.
The ESP8266 has been chosen for this project for the main microcontroller due to it's WiFi communications. The 433MHz radio chips may provide a lower power solution, however being able to use the existing WiFi infrastructure was seen as a worthwhile compromise.
The firmware supports using an ATtiny2313 as an optional power controller as this is thought to reduce overall power consumption.