I decided a few weeks ago to bring some life into my office with a plant. Since I was getting a few things at the local 24-hour megalowmart, I decided what the heck. One plant, bag of dirt, and pot (that was on sale), I had this...
I decided I wanted something to help me keep this thing alive. I didn't want to go the route of a twitter reminder, as I'm in here nearly every day. A nice, visual indicator should do well.
Since I'm a traffic engineer, I thought something with a traffic signal would be appropriate. A green for "you're good", a yellow for "getting dry", and a red for "too dry". I also like the idea of using a PIC since I haven't used those very much and I wanted to expand my horizons.
After some breadboard experiments on a breadboard, I even designed my first PC board.
The circuit uses two coin cells, a PIC 16, and a few other components (click for schematic). There is one issue with the boards - there is silkscreen covering the copper that is supposed to sense the moisture in the soil. I'll have to fix that with a razor.
Stay tuned to see how it does, once I solder components and build. I'll post the source then.