Recently I realized my local grocery store replaced traditional price tags with electronic eink (epaper) price tags / shelf labels. I found out that you can easily buy the same ones from ebay, and I was able to reprogram / hack them.
These devices can be used as cheap Arduino EInk Displays, and you can easily program these with usbTTL adapter, or any Arduino board.

The brand of the epaper display I reprogram is Hanshow, and the model is Stellar.

Here are the links which is mentioned in the video:

Blog page (in Chinese, but auto translation works fine):
http://javabin.cn/2022/epaper.html
https://github.com/reece15/stellarL3...



Other projects you might think interesting:

https://github.com/atc1441/ATC_TLSR_P...
https://github.com/reiyawea/HanshowClock
https://github.com/rbaron/pricetagpr...
https://github.com/dustybee/HanshowESL
https://github.com/ieiao/hanshow2in9...
https://github.com/search?q=hanshow









▬ Contents of this video ▬▬▬▬▬▬▬▬▬▬
0:00 Intro
0:32 Contents of the package
1:20 Teardown
5:00 Investigation existing projects
6:25 How to make connections and upload custom firmware
8:18 Bluetooth operations (updating the time, sending comments, and OTA)
12:48 Further development ideas and conclusion