Although not strictly a Raspberry Pi project, I have a couple C.H.I.P. boards[1] scattered throughout my apartment collecting temperature and humidity readings (using a HIH8120 sensor[2]) and feeding it to my Raspberry Pi which runs InfluxDB and Chronograf[3] to store and display a simple dashboard. The end result looks like this: http://i.imgur.com/cIrhSUq.png
This is really cool! I've been thinking about a similar idea lately and this seems like a great way of doing it. Do you by chance have any material on how you got the honeywell sensor working with the C.H.I.P. board? (This would be my first electronics project)
This was my first electronics project as well and I chose the Honeywell sensor because it has decent humidity accuracy (which is what I was mostly interested in) and a bonus temperature sensor built in. It uses the I2C protocol for communication which I found pleasant to work with although it would probably be simpler to just use am analog voltage sensor.
I love the C.H.I.P board, seems like they'd have better market penetration if their name wasn't "CHIP" though. I feel like the Particle IOT line has suffered a similarly hindrence?
> Why not just run InfluxDB and Chronograf on one of the CHIPs?
I started off with a single C.H.I.P. and ran everything on it but then when I added a second C.H.I.P. I wanted to have all the data in a central location. I also found Chronograf lag a lot when trying to browse more than a couple day's worth of data. The Raspberry Pi has much faster storage and CPU.
> How are you sending data to the Pi?
The C.H.I.P. has a Python script that runs on a cron that calls a C program to read the sensor and then sends it to the Pi using InfluxDB's HTTP API.
I'm the same, I use some cheap ESP8266 devices which have a temperature/humidity sensor attached. They submit their measurements every minute to a central MQ installation:
While I don't have any particular reason for collecting the data it can be fun to look at. For example you can easily spot when somebody has a shower because the humidity spikes in the bathroom:
Naively I expected to track the weather, because I figure on a hot day the temperature of my living-room/etc would spike. Turns out this house is pretty well insulated so the internal temperature has essentially no relationship to the external one. I guess that makes sense in a country where you might have -25'C in the winters.
Nothing in particular. I just wanted a way to view the temperature and humidity in my apartment when I'm out. Also I wanted to know what affects the humidity in my apartment and by how much (for example, you can see when I take my morning shower). In the future I may use the data to control a humidifier to turn it on whenever the humidity drops below a certain level.
I've been ~hoping~ to use Go to access the GPIO pins, but haven't had much success - any suggestions?