It was just a few days ago that we had the chance to cover an open source e-book reader. You can build you own with various dev kits that are available on the market. Take the M5Paper ESP32 Dev Kit for instance: it has a 4.7″ e-ink display with 960 x 540p resolution. It also has a SHT30 temperature and humidity sensor plus physical buttons. This dev kit also has a 1150mAh battery.
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The M5Paper has a microSD card slot for loading programs. Its RTC allows for deep sleep mode activation to conserve battery. Here are the main specs:
- processor: 240MHz dual core
- display: 540 x 960, 4.7″
- Multi-function button
- RTC: BM8563
- Battery: 1150mAh
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