Mat Kelcey set-up a bee hive and wondered if there was a way to count the number of bees in the hive. This, he reasoned, would give him a good indication of the health of the hive and some interesting information for studying behaviour. He set-up a Raspberry Pi, a Pi Camera, some power circuitry and put it all inside a plastic tub. Power is supplied from a LiPo with a solar panel for charging. There’s a whole bunch of stuff on his write-up about image processing, neural networks and TensorFlow that I admit to not really understanding, but if you dig deep, there’s a tremendous amount of detail. You can read his write-up here and see his code on GitHub.