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RE: ESP32 Cheap Yellow Display (CYD) Guide with a Jellyfish example

shabaz — Wed, 01 Apr 2026 15:04:05 GMT

The menu is slowly coming along..

There are just three types of things to tap on:

(a) plain buttons,
(b) buttons with a built-in value display, and
(c) buttons with on/off slider.

All the above can be individually dimmed as required, if (say) if an admin password is not entered.

For almost zero additional code, the menu code is reused to provide "MsgBox"- type functionality (see Status in the video) by simply removing the Cancel button.

Poor quality handheld video:

[View:https://www.youtube.com/shorts/JmIlt-163i0:640:360]

Another option could be to use LVGL, which apparently "ESPHome" uses, and then menus can be created with config files (I believe). It might be more heavyweight in terms of resource consumption though.

RE: ESP32 Cheap Yellow Display (CYD) Guide with a Jellyfish example

shabaz — Mon, 30 Mar 2026 16:36:06 GMT

Despite planning to rely on BLE for config, I realized that a minimal on-screen menu might be occasionally helpful for projects, for instance, to switch BLE on or off, or to enter a passkey to enable BLE or whatever.

I'm sure menu systems must exist for the CYD, but I figured it would be worth starting from scratch, to ensure very little Flash and RAM is required, and to try to keep it very general, for flexibility.

This uses C arrays, for storing each menu detail. There is a class called MenuSystem, with a displayMenu method, e.g.

menu.displayMenu(MENU_TOP, "-") would show the following:

So, if the user was to (say) press on the PWM button, then menu.displayMenu(MENU_PWM, "-") would be called (the "-" can be replaced with a default value so the user can see what's currently configured). And no backspace, just cancel to keep the code simple.

(The minus button shouldn't be there, that was a mistake in the array of button names for that particular menu).

The code allows up to 12 arbitrary buttons per menu, which is just enough for numeric, but of course insufficient for full text extry (I think that would be tedious to enter on such a small screen anyway, so it would be better to just use the BLE menu option, then do the rest on the mobile phone.

Once this is working I'll put it on GitHub.

RE: ESP32 Cheap Yellow Display (CYD) Guide with a Jellyfish example

kmikemoo — Mon, 30 Mar 2026 00:37:28 GMT

[mention:b0bc65b9ecdc4307bd967592f00e340a:e9ed411860ed4f2ba0265705b8793d05] Thank you for the detailed instructions. I also appreciate the insight on hackaday. I was thinking that I just didn't know how to use the site correctly.

RE: ESP32 Cheap Yellow Display (CYD) Guide with a Jellyfish example

DAB — Sun, 29 Mar 2026 19:19:09 GMT

Nice post.

Interesting little display.

RE: Wide 3D-Printed Breadboard Can Fit MCUs with No Wasted Pins

Andrew J — Fri, 20 Mar 2026 08:22:39 GMT

It’s an interesting idea. Would an easier approach be to cut a pre-made breadboard down the middle so the two parts can be separated to the required distance? It should be possible 3d-print a holder to put them in to keep them steady which wouldn’t require the same level of precision.

RE: Arduino Launches New Board Integrated With AI - VENTUNO Q

dixonselvan — Tue, 10 Mar 2026 06:43:41 GMT

Impressive development! Looking forward to explore this board.

RE: I wrote a hands-on Raspberry Pi Pico 2 project book — free review copies for embedded developers

micheal.embedded — Wed, 04 Mar 2026 15:24:00 GMT

im sorry just updated the github

RE: Infosec Developer Emulates X86 Processer Using CSS

DAB — Sat, 28 Feb 2026 19:19:30 GMT

Very interesting.

RE: Infosec Developer Emulates X86 Processer Using CSS

Andrew J — Sat, 28 Feb 2026 09:29:33 GMT

Astounding.

RE: Infosec Developer Emulates X86 Processer Using CSS

dougw — Fri, 27 Feb 2026 22:22:19 GMT

Very cool...

RE: Availability of Bare-Die (KGD) MCU and Sub-GHz Transceiver (Standalone or Integrated)

BigG — Sat, 21 Feb 2026 13:19:07 GMT

TI CC1352 uses M4F / CC1354 uses M33. BGA package available (DSBGA)

RE: Availability of Bare-Die (KGD) MCU and Sub-GHz Transceiver (Standalone or Integrated)

shabaz — Sat, 21 Feb 2026 11:13:57 GMT

Hi,

There was an answer to that here:

https://community.element14.com/technologies/embedded/f/embedded-forum/56658/find-wireless-arm-mcu

RE: Polpotronics Launches PicoIDE, An Emulator for Retro Hardware

dougw — Thu, 12 Feb 2026 16:00:10 GMT

It would be great if it could actually read floppies and transfer the contents to FLASH.

RE: Improving User Experience with QR Codes for Microcontrollers!

SuperMichael — Sun, 08 Feb 2026 02:59:00 GMT

I grow peaches. I want to sell them by the lb self service.

My idea is to connect a scail that outputs weight over serial connection to a micro controller. Then calculate the price. The I would like to imbed that price into a (mailto) along with my email. I'd then like to display that mailto as a QR code.Mailto will populate the senders email automatically. I will then send an e transfer request to that email.

customer puts the peaches on the scail, they scan the QR with there phone, click link , email app opens, click send, they get a notification on there bank app to approve e transfer.

Or should I do price by peach and my email for e transfer? Probably better...

RE: Working with the Renesas RA4M1 Microcontroller

Diego56 — Tue, 16 Dec 2025 04:44:27 GMT

What about using plain C instead of C++?