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Thermal imaging with Flir Lepton sensor

Thermal imaging devices are still too expensive for non commercial use. But this doesn’t mean that those images can’t be interesting to play with on a hobby level. You could use this for inspecting electronics hots spots, detecting low temperature resistance areas around the house and do other crazy things. Andrew got a chance to play with Flir Lepton thermal imaging sensor, so he have written a driver to make it useful. Sensor has 80×60 resolution with 14bpp. This may seem low, but having in mind that each pixel detect temperature level, then it is more than enough to get useful data.

thermal_imaging

He’s chosen an STM32F4 processor on a Nucleo board. The he attached Gameduino 2 which features FT800 graphical processor with fairly large LCD on top. Sensor module communicates over SPI interfaces (there is an option for I2C). In order to extend images for full screen on LCD, he used interpolation methods like simplest “Nearest neighbor”. For better results he suggests using more advanced methods like Bilinear/Linear/Sinc interpolations.

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