yob / home-data Goto Github PK

Collecting various data from home and sending it to datadog.

I'm not totally convinced by home automation - I'm nervous about the time investment required to build a rube goldberg machine that turns on my hall light when I walk in the door.

However, monitoring my house is interesting.

So far the following devices are monitored and charted in datadog:

• 4x indoor ruuvi tags, for temp/humidity
• 1x outdoor ruuvi tags, for temp/humidity
• 3x daikin split systems, for on/off state and power consumption
• 1x fronius solar inverter, for solar generation and overall house power draw
• human presence at home, via phone reachability on the local LAN

Of those, the daikin splits could also be automated to turn on/off under different conditions. So far I haven't explored that yet.

Here's part of the dashboard I get:

I'm a software guy, and this was a good excuse to explore golang. In particular, I wanted to try the actor pattern using only channels for cross-goroutine communication.

The result is ~1500 lines of go (so far) that does just what I need. I have to maintain it and don't get all the home Assistant bells and whistles, but I'm OK with that for now. I'm learning a lot along the way.

If I do any automation, it will probably be focused on energy efficiency and responding to electricity price signals.

My electricity retailer (amber) uses variable pricing based on the wholesale market, and it might be nice to heat our hot water when prices are low, turn down the AC when prices are high, or turn on the heating when prices are negative and we can be paid to consume electricity.

I generally develop this on my intel laptop, and deploy it to a raspberry pi 4 that's on 24/7. Here's the cross compilation commands:

GOOS=linux GOARCH=arm GOARM=7 go build -o build-arm64/home-data .
GOOS=linux GOARCH=arm GOARM=7 go build -o build-arm64/jsontohttp ./jsontohttp/