Merlot, an open-source three-color wireless electronic paper display

dcexpert

Merlot, an open-source three-color wireless electronic paper display [Copy link]

 

Merlot, an open source hardware three-color wireless electronic paper display programmable using Arduino, MicroPython or ESP-IDF frameworks – CNX Software .

dcexpert

Technical Specifications:

• Wireless module — ESP32-WROOM-32 module with ESP32 dual-core processor, 4 MB SPI flash, 2.4 GHz WiFi 4 and Bluetooth LE connectivity
• Storage — MicroSD card slot for storing images, files, etc.
• Display — 4.2-inch tri-color e-paper display with 400 x 300 resolution; Full refresh: ~17 seconds; Partial update: also 17 seconds…
• USB — 1 USB Type-C port for charging and programming
• Expansion — 26-pin expansion header with 8 GPIO, I2C, UART, SPI. ESP_EN is used to enable/disable the ESP32 to reduce power consumption, and LDO_EN is used to shut down the board.
• Debug — via USB Type-C port connected to CP2104 USB-UART chip
• Others - 4 tactile buttons, piezo buzzer, reset button, charging indicator LED
• Battery - 3.7V 1900 mAh Li-Polymer
• Power— 5V via USB Type-C port, 2-pin battery connector, and battery charger circuit
• Power consumption - <20uA in sleep mode
• Dimensions - PCB: 92.1 x 78.1 mm; Housing: 98 x 82 x 16 mm
• Certification—FCC/CE

tagetage

Full refresh: ~ 17 seconds; partial update: also 17 seconds... It doesn't work to make a stopwatch, it can only display to the minute.

dcexpert

tagetage posted on 2023-1-3 10:35 Full refresh: ~ 17 seconds; Partial update: also 17 seconds... It's not possible to make a stopwatch, it can only display to the minute.

It's indeed too slow.

tagetage

dcexpert posted on 2023-1-3 11:42 It is indeed too slow.

I checked the domestic data and found that the full refresh time is 16 seconds, which is indeed slow.

4.2 inches/black, white and red electronic paper/resolution 400x300

OKRA0420RWS830F0 is a three-color 4.2-inch e-paper display with a resolution of 400x300, 24pin feet, communication via SPI interface, with an embedded controller (COG package) and waveforms stored on-chip, supporting black, white and red display, with ultra-low power consumption, a viewing angle of about 180 degrees, and readable in sunlight. It is an excellent choice for applications such as shelf labels, smart labels, smart home applications, industrial tools, smart cards and electronic tags.

Note: Only monochrome e-paper displays support partial refresh, while tri-color e-paper displays do not support partial refresh (only full refresh is supported).

dcexpert

tagetage published on 2023-1-3 13:31

The display effect is better than monochrome, but the electrical characteristics are not good

lugl4313820

I have several screens sleeping, but I just can't muster the interest to drive them.

dcexpert

lugl4313820 posted on 2023-1-5 15:39 I have a few screens sleeping, but I just can't muster the interest to drive them.

You can try DIY

xutong

ESP32 is really , it can be used everywhere