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Pixy2 OCR firmware

I bought a pixy2 recently and I would like to modify the firmware to make the camera capable of recognizing three letters (HSU) printed in a sans serif font in black, the letters are 16cm². The pixy already recognizes lines and intersections so I hope this isn’t going to be too difficult. In what programming language does the firmware addition needs to be written? any advice anyone can give me to achieve this?

Pixy’s firmware is written in C/C++ and assembly. You can find more information here: