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Have you looked at OpenDisplay? I have recently been playing with 4 color shelf displays from supermarkets. I have one showing max UV in my bathroom and whether I should wear sunscreen. Any Bluetooth proxy can write ODL/OEPL data to the device. There is a designer (https://schlomo.github.io/odl-drawcustom-designer/).

by joshstrange1 hours ago|

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I have not, I'll have to check this out. While I like my smart home stuff off my network (Z-Wave/Zigbee) I do have a soft spot for ESP32 (and it's own SSID/Vlan). I currently don't "manage" any bluetooth devices but I'll have to take a look!

> 4 color

I guess I should just get over myself but color e-ink (I have one) drives me nuts with its refreshing. At least the one I have can't partial refresh so it's a ~20-30 second flashing-hell every time you want to draw anything different. To be fair, I have these updating once a day and when I'm asleep so "who cares" but doing any active development/testing with one is maddening.

EDIT:

Holy crap, the ESP32 vs BT comparison is crazy! I would never have guessed it was that stark. Though it makes sense, I have mine deep sleep for all but <1min every day to wake and update and with config they should last months, but _years_ with regular updates throughout the day? So freaking cool!

I'll probably be looking into some BT screens. It looks a little more DIY than the reTerminals I have but maybe this is the final push to get me, back, into 3D printing (enclosures for the board/screen/battery).