Connecting multipe E-Paper panel to 1 MCU
Hi, I want to ask is it possible if I use several (5 to 10) of this panel and connect to 1 ESP32?
Using this module is overkill and the price is too much to be used as price tag in supermarket.
From what I read from this datasheet, connection from panel to MCU just an SPI. So theoretically, it is possible to connect several e-paper panel through cable to 1 ESP.
I need your advice.
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Hello @sachli,
Thank you for your information.
Theoretically possible, the screen uses the SPI interface, an SPI bus that allows multiple devices to share the same set of MISO, MOSI, and SCK pins, and different chip select (CS) pins to distinguish different devices.
Each E-Paper screen needs to be assigned a separate CS pin for control.
Connection:
1. The MISO, MOSI and SCK pins of all screens need to be connected to the corresponding pins of the ESP32 respectively
2. Assign each screen a separate GPIO pin as its chip select signal
Note:
Ensure stable power supply to all screens to avoid communication failures due to power problems
Ensure that enough time is allowed for SPI transfers when switching chip select signals to avoid data conflicts