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Reverse-Engineering the LCD Display Interface of the Nest 2nd Gen Thermostat
In which I pried open the glass LCD lens at the front of my Nest 2nd Gen thermostat and found the LCD display module, packaged with a flexible ribbon cable and a round pixel array, and took a months-long journey of reverse engineering, detective work, and problem-solving that taught me more about display interfaces tha
In which I pried open the glass LCD lens at the front of my Nest 2nd Gen thermostat and found the LCD display module, packaged with a flexible ribbon cable and a round pixel array, and took a months-long journey of reverse engineering, detective work, and problem-solving that taught me more about display interfaces than any tutorial ever could have. I managed to obtain the datasheet for the TM025ZDZ01, which had the pinout, the electrical specifications but also code samples for the interface requirements and initialization sequences. Helpfully, it seems like a lot of these color LCDs follow a similar command structure and the Toit Color-TFT library as well as the LVGL project have been instructive in making sure we have a performant LCD driver.
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