This post is part of the Temperature monitoring project.
Temperature Sensors are the on-site devices that measure temperature and send them to the remote unit of the site.
- Radio transmission
- Capability to use commercial sensors, as well as home made.
Using commercial sensors was mandatory for me to take advantage of the following:
- Low power devices using battery lasting several years.
- Robust and designed for external conditions (low & high temperature, humidity…).
- Having a pretty well designed display station that can be used to look at temp locally.
So this will remove some design burden.
Actual device choice was not so much though:
- Having already Oregon Scientific sensors, and that being a well known brand, I went to the local store and bought the first one that was enough pretty and not too expensive.
- Halas! I should have googling a little more before that. The model I bought is EW91, and has a new transmission protocol. The idea was to re-use code for decoding borrowed from internet. Not conscious it will be not so easy, I started reverse engineering this protocol instead of purchasing another model. More on that in a coming notes I’ll post soon.