/epdiy

EPDiy is a driver board for affordable e-Paper (or E-ink) displays.

Primary LanguageCGNU Lesser General Public License v3.0LGPL-3.0

Documentation Status Matrix JoinSlack

EPDiy E-Paper Driver

EPDiy is a driver board which talks to affordable E-Paper (or E-Ink) screens, which are usually sold as replacement screens for E-Book readers. Why are they interesting?

  • Easy on the eyes and paper-like aesthetics
  • No power consumption when not updating
  • Sunlight-readable

Ready-made DIY modules for this size and with 4bpp (16 Grayscale) color support are currently quite expensive and / or slow. The EPDiy controller can drive the bare display modules, e.g. from old e-Readers, which are available for 20$ (small) / 30$ (large) on ebay! Additionally, since it is based on the ESP32S3 (V7) / ESP32 (V2-V6) microcontroller, it features WiFi and Bluetooth connectivity.

The EPDiy driver board targets a range of E-Paper displays, as shown in the table below. As the driving method for all matrix-based E-ink displays is more or less the same, only the right connector and timings are needed. The current V7 board has three different display connectors, other display will require an adapter board.

The controller is optimized for the use with LiPo batteries, featuring a LiPo charger and ultra-low deep sleep current.

This project supports a driver for the ESP-IDF and Arduino. For installation instructions, please refer to the documentation. Note that for epdiy V7, update speeds are significantly lower when using the Arduino IDE, because it does not allow to change the sub-optimal cache configuration.

Get Inspired

The examples directory contains some example applications like a weather station or a screen diagnostic test. If you want to build something more useful though, how about:

  • A serial terminal for connecting to a raspberry pi: video repository]
  • A Music Player Daemon (MPD) dashboard: repository]
  • An e-Paper picture frame: video
  • And more to come!

Building It

On the EPDiy Hardware Page, you'll find a list of all boards and variants, adapters, and helpers. Next to each board, there are manufacturing files (gerbers), Bill of Materials (BoM), part placement files, and 3D models ready to use!

demo image

For ordering from JLCPCB for example, ordering is as easy as downloading the zipped gerbers, BoM, and placement file and uploading them. The process is very similar for other manufacturers, check your vendor's documentation for details. Don't forget to oder adapters if the board doesn't have connectors for your specific display.

The current latest version is epdiy V7, beased on the ESP32S3. Older versions are also available on the hardware page.

Contributing Hardware

Want to contribute your own board variant or adapter? Check out the epdiy-hardware repository for instructions.

Gettings Started

For instructions and more information visit the documentation!

Join the Discussion

  • Matrix Matrix Community: +epdiy:matrix.vroland.de
  • Slack: See badge

Displays

Name Size Resolution Compatible Connector Pin count Compatible since pcb version Notes
ED060SC4 6" 800 x 600 yes, tested FH26W-39S-0.3SHW(60) 39 v2
ED097OC4 9.7" 1200 x 825 yes, tested XF2M-3315-1A 33 v2 Cheap, inferior contrast
ED097TC2 9.7" 1200 x 825 yes, tested XF2M-3315-1A 33 v2 Slightly higher price, better contrast
ED097OC1 9.7" 1200 x 825 yes (should work) XF2M-3315-1A 33 v2 Cheap, inferior performance
ED047TC1 4.7" 960 x 540 yes, tested 40-pin 40 LILYGO 4.7" EPD Supported only by 4.7" e-paper board by LILYGO
ED050SC5 5" 600 x 800 yes, tested THD0510-33CL-GF 33 v5
ED050SC3 5" 600 x 800 yes (should work) THD0510-33CL-GF 33 v5
ED133UT2 13.3" 1600 x 1200 yes, tested adapter board 39 v2 Adapter Board required, also PENG133D
ED060XC3 6" 758 x 1024 yes, tested THD0515-34CL-SN 34 v5 Cheapest, good contrast and resolution
ED060XD4 6" 758 x 1024 yes, tested THD0515-34CL-SN 34 v5
ED060XC5 6" 758 x 1024 yes (should work as ED060XC3) THD0515-34CL-SN 34 v5
ED060XD6 6" 758 x 1024 yes (should work as ED060XC3) THD0515-34CL-SN 34 v5
ED060XH2 6" 758 x 1024 yes (should work as ED060XC3) THD0515-34CL-SN 34 v5
ED060XC9 6" 758 x 1024 yes (should work as ED060XC3) THD0515-34CL-SN 34 v5
ED060KD1 6" 1072 x 1448 yes (should work as ED060XC3) THD0515-34CL-SN 34 v5
ED060KC1 6" 1072 x 1448 yes (should work as ED060XC3) THD0515-34CL-SN 34 v5
ED060SCF 6" 600 x 800 yes, tested THD0515-34CL-SN 34 v5 Different flex cable shape
ED060SCN 6" 600 x 800 yes (should work as ED060XC3) THD0515-34CL-SN 34 v5 Different flex cable shape
ED060SCP 6" 600 x 800 yes (should work as ED060XC3) THD0515-34CL-SN 34 v5 Different flex cable shape
ED060SC7 6" 600 x 800 yes (should work) AXT334124 34 v5 connector dropped in v6
ED060SCG 6" 600 x 800 yes (should work) AXT334124 34 v5 connector dropped in v6
ED060SCE 6" 600 x 800 yes (should work) AXT334124 34 v5 connector dropped in v6
ED060SCM 6" 600 x 800 yes (should work) AXT334124 34 v5 connector dropped in v6
ED060SCT 6" 600 x 800 yes, tested AXT334124 34 v5 connector dropped in v6
ED078KC1 6" 1872 x 1404 yes, tested FH12-40S-0.5SH 40 v7 16 data lines

Troubleshooting

The following list is compiled from past experiences and GitHub issues:

  • The displayed image displays only part of the image. Make sure to select the correct display type as described here.
  • The existing image fades / darkens when updating a partial screen region. Make sure the VCOM voltage is calibrated for your specific display.
  • The second third of the image is replaced with the last third. This seems to be a timing issue we could not yet quite figure out the reason for. For a workarround or suggestions please join the discussion.
  • The ESP does not boot correctly when external periperals are connected. Make sure not to pull GPIO12 high during boot, as it is a strapping pin internal voltage selection (vroland#17).
  • The ESP power consumption in deep sleep is too high. Add rtc_gpio_isolate(GPIO_NUM_12); to your solution. See also Configuring IOs (Deep-sleep Only).

LilyGo Boards

There are several differences with these boards. One particular one is the way the LilyGo handles power to the display the official lilygo code has two states. This is now handled in epdiy in a different way to the lilygo code. epd_poweroff() completely turns the power off to the display and the other peripherals of the lilygo. The new function epd_powerdown() keeps the peripherals on (this allows the touch functions to continue to work). epd_poweroff() should allways be called before sleeping the system You can still use touch to wake the screen with the following. In Arduino it works like this. epd_poweroff();

epd_deinit();

esp_sleep_enable_ext1_wakeup(GPIO_SEL_13, ESP_EXT1_WAKEUP_ANY_HIGH);

esp_deep_sleep_start();

More on E-Paper Displays

If you know any other useful resources or have suggestions, please comment on #31!

Hackaday Project

For more details, see the project page on Hackaday: https://hackaday.io/project/168193-epdiy-976-e-paper-controller

demo image board front

Licenses

The weather example is Copyright (c) David Bird 2018 (except for minor modifications). Please refer to examples/weather/README.md for details.

The board and schematic are licensed under a Creative Commons License Creative Commons Attribution-ShareAlike 4.0 International License.

Firmware and remaining examples are licensed under the terms of the GNU Lesser GPL version 3. Utilities are licensed under the terms of the MIT license.