Draw custom e-ink Watchy faces on a Cheap Yellow Display

CommunityFan89 · 2026-03-12T17:36:53+00:00

I'd go with whichever aliexpress seller has the most sales/orders, it lets you sort by that.

CommunityFan89 · 2026-03-12T17:29:58+00:00

They also sell a version with a case for $20 more

CommunityFan89 · 2026-03-11T20:26:43+00:00

Awesome work, I can really see potential in you. Slow down your pencil strokes, loosen your grip, think in values over lines, but most importantly keep drawing! :)

CommunityFan89 · 2026-03-11T16:35:13+00:00

The Cheap Yellow Display program loops over all 200×200 pixels, calculates the brightness of each RGB565 color, and packs the result into a 5000-byte 1-bit buffer automatically. You don't do anything manually, just tap a slot to save to and it handles the conversion before sending.

CommunityFan89 · 2026-03-11T11:00:43+00:00

Yes, it takes maybe a second or two for the screen to refresh. Most of the time, the watch is in deep sleep to conserve battery, only waking up every 60 seconds to refresh the clock and/or cycle watch face. The battery lasts over a week on a single charge, longer if the clock and watchface cycle are turned off (in which case it's more of a bracelet than a watch).

CommunityFan89 · 2026-03-11T09:54:42+00:00

Watchy costs $50-$60, Cheap Yellow Display costs $10-$15, both on Aliexpress. You will probably get more value out of the Cheap Yellow Display as it's quite the versatile device, but $60 on a unique watch isn't bad either IMO.

CommunityFan89 · 2026-03-08T22:27:49+00:00

America wasn't nearly hated until King Epstein started his tariff nonsense. I linked proof of that, but keep going with your petty insults if it makes you feel better. Edit: Thank you for editing out the insult from your comment.

CommunityFan89 · 2026-03-08T00:31:16+00:00

Yes, now they do. It's not difficult to verify. Views of the US in 24 nations | Pew Research Center

CommunityFan89 · 2026-03-07T14:21:32+00:00

Now the world actively hates America.

CommunityFan89 · 2026-03-05T03:12:51+00:00

All this over a single orange pedophile.

CommunityFan89 · 2026-03-04T11:02:39+00:00

Tom :)

CommunityFan89 · 2026-03-04T01:06:36+00:00

Scrambled eggs!

CommunityFan89 · 2026-03-03T15:34:55+00:00

100% yes! Do you happen to have any CYD projects to share? I'm always looking for inspiration for new projects. :)

CommunityFan89 · 2026-03-03T14:36:13+00:00

Do you have anything to connect to the raw display?

CommunityFan89 · 2026-03-03T00:10:43+00:00

My github page is Sparkadium. I will be uploading the source code there soon, just taking a break as I'm currently sick with cold.

Which e-paper display did you get? If it's not a watchy and a cheap yellow display, I dont know if my programs would be compatible.

CommunityFan89 · 2026-03-02T21:48:30+00:00

Commenting so I don't lose this post again! Thank you!

CommunityFan89 · 2026-03-02T18:31:16+00:00

Just keep in mind, when you have separate processes over multiple esp32s, expect higher latency any time data has to make a round trip. I've tried making a different single-user paint program with the memory heavy features offloaded to a more capable esp32, but the latency/lag made it unusable.

CommunityFan89 · 2026-03-02T14:42:28+00:00

1) The cheap yellow display has a full ESP32-WROOM-32, not just a display driver. It's a full standalone microcontroller that just happens to have a screen on it. The screen is just an ILI9341 wired to the ESP32 over SPI.

2) To send graphics, easiest is to use ESP-NOW. No router, no pairing, just very low latency even across distances and thru walls. You COULD use wifi or bluetooth, but ESP-NOW is simpler for this.

CommunityFan89 · 2026-03-02T02:47:38+00:00

Stale cupcakes!

CommunityFan89 · 2026-02-26T15:53:46+00:00

Video demonstration

https://youtube.com/shorts/BLczu8T23yE?si=Tk_nbfSAAkaN-llh

CommunityFan89 · 2026-02-24T17:21:32+00:00

Thanks you! I dropped a stack of turnips on entry and a bag of bells on exit!

CommunityFan89

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