Houseplant watering monitor

Pre-order: ships in January!

This is a slightly experimental board I made for myself to make sure I watered my plants at the right time. It uses an ultra low power chip to measure soil moisture capacitivley, and displays that on a cool little e-paper bar chart. It runs off a CR2302 coin cell which should last well over a year before it needs changing. 

I've been using these around my house for a few months now and I'm happy to say that they work great! I'm manufuacturing another small batch of them so that I can keep an eye on a few more of my plants. Due to economies of scale I've actually made more than I need, so the extras are up for sale just in case anyone is interested. I'd love to hear feedback and if people like them then I might make more!