The goal of this HAT is to provide WiFi, an RTC and 3.3 to 5V step-up for a fast epaper update using IT8951Designed by Fasani Corporation in Spain
What is it? The PCB is a HAT to use on top of DEXA-C097 (DEXA uses IT8951 just as M5-epaper does but for a bigger resolution of 1200*825). Please note that this requires an IT8951 epaper controller …Read More…
The PCB is a HAT to use on top of DEXA-C097 (DEXA uses IT8951 just as M5-epaper does but for a bigger resolution of 1200*825). Please note that this requires an IT8951 epaper controller that is actually sold only by Good-Display. This is not cheap technology to play with so I recommend getting this ESP32-S3 HAT with 2 MB PSRAM + DEXA-C097 board only if you want to build a product or a industry quality information panel using an epaper display. I recommend developers this ESP32S3 plus the DEXA board for applications that need fast refresh like the e-book readers have. As a demo Firmware and proof-of-concept for this PCB, we built the repository: epaper-weather-station Using that Firmware you can print RTC clock, day, month and temperature just using the data coming from DS3231 on the board. Additionally there are some goodies like sleep at night and wake up with RTC alarm, and added components also for SCD40/41 sensor (CO2 level, precise temperature and humidity)
The PCB is also OSHWA Certified with UID ES000029 so you can check there to access all it's design files and schematics. If you don't want to buy it and want to fabricate it yourself it's allowed, so you can go ahead and use it also commercially. We would love that you buy one first to try what is capable off before making some of them!
I wanted to use ESP32S3 in a new PCB that also provides a battery charging circuit and a DS3231 real-time clock so you can build a professional product using a 9.7" parallel epaper display with 16 grayscales and 1200x825 resolution. S3 will also provide fast WiFi connectivity and powerful BLE to make a low consumption application. I also made this board to provide a 3.x V to 5 Volt boost converter to the DEXA board below since it needs this voltage.
At the moment if you want to drive this displays using ESP32 the only chance to do so is to use EPDiy that is a very nice PCB that drives this epapers too. But the waveform is open source and also is slower, meaning that you cannot refresh as fast as using this HAT. So the challenge was to build a PCB that provides:
SPI pins configuration:
I2C has already 4.7K pull-up resistors in place. Enable 5V boost-converter using IO 38 (on HIGH enabled)
#define GPIO_ENABLE_5V GPIO_NUM_38
Please check one page presentation PDF. Do not connect SDA & SCL (I2C) pins to DEXA-C097 board below. There is an issue and doing that will block I2C communication. I2C is anyways very slow and not recommended to send the framebuffer to IT8951. Please use SPI to talk to to DEXA-C097 board.
Revision 1.1 comes with an amazing ESP32-S3-WROOM-1-N8 MCU with 2 MB of PSRAM. The PCB comes with a 12 mm coin battery holder and with the battery itself so it can maintain the RTC clock running for at least 5 years. This revision also has a load switch, that is activated on GPIO 38 High, and turns on the 5V to feed the I8951 board below. So this time you can use the epaper controller only when you want and then completely turn it off. It will be optimized for lower consumption and address many of the problems described before.
Check the Hardware repository to see the correct labeling for the board below (This one has already the correct SPI labeling on top)
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