fruchti/inverse_thermal_camera
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This is the firmware for a simple thermocromic selfie camera based on

  • A OV7670 camera module (without FIFO),
  • A STM32F103C8T6 microcontroller, and
  • A LTP1245 thermal printer module.

Apart from that, only a level shifter for the thermal printer (which needs 5 V signals), a motor driver for its stepper, a pullup for its thermistor, and a MOSFET for turning all power off are needed.

More details can be found here.