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Using RaspberryPi, Thermal Camera and Machine Learning can detect presence of people using deep neural networks. Unlike motion sensors, thermal cameras can detect people even when they aren’t moving. Unlike optical cameras, they detect bodies by measuring the heat that they emit in the form of infrared radiation. For this project, I’ve used the MLX90640 Pimoroni breakout camera (cost: $55), as it’s relatively cheap, easy to install, and it provides good results.