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I’m sorry to have to let you know your wallet may empty if you have not seen this already: [edit: 4.7” ESP32 based epaper display with touchscreen, built in ba

by jaidan 5y ago

I’m sorry to have to let you know your wallet may empty if you have not seen this already: [edit: 4.7” ESP32 based epaper display with touchscreen, built in battery and expansion ports] https://shop.m5stack.com/products/m5paper-esp32-development-kit-960x540-4-7-eink-display-235-ppi?variant=37595977908396 https://shop.m5stack.com/products/m5paper-esp32-development-...

nisegami 5y ago
This is incredible for something I have in mind. Going to do a bit more reading, but the price and size are ideal for my use case.
azeirah 5y ago
I scoured the wave share site for all the other e-ink screens and there're many cheaper ones. You can get small e-ink screens (without a HAT, requires adapter ~10$ and dev board which is necessary anyway) for much cheaper. 5.8 inch is 40$ 800×480, 7.5inch 50$ 400x300, 4.2inch E-Ink raw display, three-color 26$ The cheaper ones are cheap because: 1) Each size comes in a low res and a high res variant, the low res ones are a lot cheaper 2) No HAT, so no built-in dev board for the PI. You do need to somehow connect it to your dev board. An adapter with SPI costs 10$, a dev board with esp8266 that has built-in adapter costs ~18$. Both are officially from wave share available on their site as well 3) All boards below 7 inch are relatively affordable. After that the price increases are huge 4) Not sure why, but price difference between black/white and 3-color is negligible. So feel free to pick a 5 inch tricolor screen for like 40$!
- antoniuschan99 5y ago
  I’m waiting on the dev board they sell on waveshare. Definitely affordable under $20. For this type of project the esp32 seems like the better choice than the pi zero. There’s also the RP2040 if you want work in the pi ecosystem. Arduino and u-blox have those with wifi I think
- dmitrygr 5y ago
  re: #4 Watch out for a few things: 1. Refreshes are much slower on 3-color eInk panels than on monochrome ones (eg: 20 sec vs 2) 2. Partial refresh on 3-color panels is rare and quickly gets messy around the edges. Partial refresh on monochrome panels is a relatively simple thing to do. 3. Greyscale on a 3-color eInk screen is VERY VERY VERY hard! Officially it is not supported at all. By any 3-color panel. I made it work [1] but even then, it is very very slow (bordering on a full minute per refresh). 4. Stock waveforms are rarely good. And almost no vendor will give you proper temp-compensated partial update waveforms. Developing your own waveforms for monochrome panels is easy and simple (~day). Developing your own waveforms for 3-color panels is a lot of work (~weeks + more weeks once you need to support more than just "21-25 celsius") [1] http://dmitry.gr/?r=05.Projects&proj=29.%20eInk%20Price%20Tags http://dmitry.gr/?r=05.Projects&proj=29.%20eInk%20Price%20Ta...

by jaidan 5y ago

nisegami 5y ago

This is incredible for something I have in mind. Going to do a bit more reading, but the price and size are ideal for my use case.

azeirah 5y ago

I scoured the wave share site for all the other e-ink screens and there're many cheaper ones. You can get small e-ink screens (without a HAT, requires adapter ~10$ and dev board which is necessary anyway) for much cheaper. 5.8 inch is 40$ 800×480, 7.5inch 50$ 400x300, 4.2inch E-Ink raw display, three-color 26$ The cheaper ones are cheap because: 1) Each size comes in a low res and a high res variant, the low res ones are a lot cheaper 2) No HAT, so no built-in dev board for the PI. You do need to somehow connect it to your dev board. An adapter with SPI costs 10$, a dev board with esp8266 that has built-in adapter costs ~18$. Both are officially from wave share available on their site as well 3) All boards below 7 inch are relatively affordable. After that the price increases are huge 4) Not sure why, but price difference between black/white and 3-color is negligible. So feel free to pick a 5 inch tricolor screen for like 40$!

antoniuschan99 5y ago
I’m waiting on the dev board they sell on waveshare. Definitely affordable under $20. For this type of project the esp32 seems like the better choice than the pi zero. There’s also the RP2040 if you want work in the pi ecosystem. Arduino and u-blox have those with wifi I think
dmitrygr 5y ago
re: #4 Watch out for a few things: 1. Refreshes are much slower on 3-color eInk panels than on monochrome ones (eg: 20 sec vs 2) 2. Partial refresh on 3-color panels is rare and quickly gets messy around the edges. Partial refresh on monochrome panels is a relatively simple thing to do. 3. Greyscale on a 3-color eInk screen is VERY VERY VERY hard! Officially it is not supported at all. By any 3-color panel. I made it work [1] but even then, it is very very slow (bordering on a full minute per refresh). 4. Stock waveforms are rarely good. And almost no vendor will give you proper temp-compensated partial update waveforms. Developing your own waveforms for monochrome panels is easy and simple (~day). Developing your own waveforms for 3-color panels is a lot of work (~weeks + more weeks once you need to support more than just "21-25 celsius") [1] http://dmitry.gr/?r=05.Projects&proj=29.%20eInk%20Price%20Tags http://dmitry.gr/?r=05.Projects&proj=29.%20eInk%20Price%20Ta...