In Part 1 of this, I went over the setup of ThingSpeak and several associated and almost-associated packages.
This part will be more about the funner stuff.
Rain Gauge Reader
The first thing I had to do was build a rain gauge reader. I ultimately started that before doing part one, but then moved on to a standalone node.js program that counted clicks from the rain gauge.
The rain gauge is a tipping-bucket rain gauge that tips when the rain gets to 0.2mm. The guts are in the picture below.
The rain gauge initially came with a little board that has a PIC and an EEPROM that stored clicks. I didn't care for that idea, since the ultimate plan is to see if we can put this on our building's roof with a battery and a solar panel.
This is where the BBB comes in. I connected the rain gauge to the BBB and started playing with node.js until I came up with the program in the gist below.
After setting it up, it was time to test.
The third part of this will be making this fault-tolerant: fixing the time issue (it doesn't keep time), starting things during startup, and security.