4inch AP - OpenEPaperLink/OpenEPaperLink GitHub Wiki
"4inch AP"
An "4inch AP" can be built by adding a RF coprocessor module to a Guition ESP32-4848S040 ESP32-S3 module via the 8 pin connection on the back.
The Guition module is basically a LilygoT-Panel without the H2 and is a lot less expensive.
Any RF coprocessor module that supports the OELP serial protocol for IEEE 802.15.4 and/or SubGhz communications can be used.
Currently OEPL coprocessor firmware is available for TLSR, ESP-C6 and ESP-H2 modules.
ATC1441's TLSR RF coprocessor
Parts:
- TB03F TLSR Module
- AMS1117 3.3V Regulator
- Pin header Male 2x4 or 2*1x4 2.54mm
| Pin | Signal | TB-03F | ESP32-S3 | Regulator |
|---|---|---|---|---|
| 1 | GND | GND | GND | GND |
| 2 | GND | GND | GND | GND |
| 3 | TXD out | PB1 | GPIO40 | |
| 4 | RXD in | PA0 | GPIO44 | |
| 5 | SWS | SWS | GPIO2 | |
| 6 | N/C | |||
| 7 | Reset | Reset | GPIO1 | |
| 8 | 5V | VIn | ||
| 3.3V | 3V3 | VOut |
[!IMPORTANT] The RF coprocessor should not be connected to the Guition module while flashing since the RXD pin of the ESP32-S3 is needed for flashing via USB and is also used by the coprocessor. Flashing of the TLSR module needs to be done via the good old UART Method as any other TLSR Txd to SWS.
Once a 3.3v compatible UART is connected to the TLSR module open https://atc1441.github.io/ATC_TLSR_Paper_UART_Flasher.html in a browser with Web USB support to flash it.
In the future a programmer might be added to the OEPL AP.
TLSR Firmware is available here and PCB Gerber files are available here.
For the best fit it is best to remove the spacer from the 2.54mm header and snip of the extra pins height after building the PCB.
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