Comments on: ESP32 Cheap Yellow Display (CYD) Pinout (ESP32-2432S028R)

By: TecKnight

TecKnight — Tue, 10 Jun 2025 04:55:03 +0000

In reply to Chris. Thank you Chris. That is a very useful diagram !!

By: Abhi

Abhi — Mon, 02 Jun 2025 15:34:23 +0000

I am trying to run a webserver at the same time. And I am already utilizing ESP now on my main ESP. I was never able to figure out how to use both at the same time so I thought I would give it a try using i2c

By: Abhi

Abhi — Mon, 02 Jun 2025 15:34:06 +0000

In reply to Sara Santos. I am trying to run a webserver at the same time. And I am already utilizing ESP now on my main ESP. I was never able to figure out how to use both at the same time so I thought I would give it a try using i2c

By: Sara Santos

Sara Santos — Mon, 02 Jun 2025 15:15:15 +0000

In reply to Abhi.

Hi.
Yes, you can do that. But…
… have you considered using wireless communication protocols to communicate with the other board?
One of the best and easiest ways is using ESP-NOW.
You can check our ESP-NOW tutorials here:
– https://randomnerdtutorials.com/?s=ESP-NOW

And you can get started here: https://randomnerdtutorials.com/esp-now-esp32-arduino-ide/

Regards,
Sara

By: Abhi

Abhi — Mon, 02 Jun 2025 14:17:36 +0000

I would like to connect my CYD to another ESP32 via Uart or some other way. I cannot use pins 22 or 27 becuase I already have a device on them. Can I remove the led and use those pins? I’ve read the RX and TX pads will not work becuase they are tied to the USB

By: Brian

Brian — Sat, 10 May 2025 17:30:36 +0000

Hi!

When I do an analogRead() on an unconnected pin 27, I get 4095 returned. I expect 0 returned.
So I tried analogRead() on an unconnected pin 22, I get the expected 0 returned.

Any idea why pin 27 returns 4095?

Thanks!

By: Micke

Micke — Tue, 15 Apr 2025 15:22:37 +0000

I have tried to get the SD-card reader to work at the same time as the Touch, but no success.
I have
SPIClass tsSPI = SPIClass(VSPI);
and
SPIClass sdSPI = SPIClass(HSPI);

Is there anything else I have to consider, any small help would be appreciated.

By: Roberto

Roberto — Thu, 13 Mar 2025 06:58:30 +0000

hy i’m using esp32-2432s028r since a month, have successfully added one Lipo battery and it’s charger getting Vin from USBc (haved taken out the protection diode to separate circuits) and putting regulated Vout to v3.3 rail (on the s3/s1 pads).

-> Cannot locate PIN to monitor the v3.3 rail voltage and check for battery status: any suggestion? tnx br

By: Dr Quark

Dr Quark — Fri, 21 Feb 2025 17:44:54 +0000

In reply to Sara Santos.

The TX and RX pins are tied both to the CH340 and to the Serial0 pins on the ESP32. So they repeat the incoming USB serial data and copy the outgoing Serial(0) TX data. I don’t see any use for the serial connector except for external power. If you wanted to cut the leads to the tri-color LED, you could use pins 16/17 and Serial(2).

I think I’ll just use an ESP32 Dev Kit Serial(2) and transfer CYD data via MQTT over to my local serial buss.

By: Pete Fulham

Pete Fulham — Sat, 15 Feb 2025 19:39:03 +0000

Just purchased a CYD board/display, looking at how to make use of it.
Tutorial above is a good introduction to it.

Having read some of the comments above re the lack of GPIO’s (of which there clearly is). I had to smile when some of the clever peeps on here are suggesting taking bits off the board to try and ‘frig’ an extra gpio or 2. Which is great if you are good at that stuff (which some of you guys definately are). Whilst not a stranger to a soldiering iron I personally don’t think I would want go messing around with the board.

Given how cheap a ESP32 module is, why not purchase a none display ESP 32. Then Use wifi, Bluetooth, serial, or ESP Now to communicate? RNT has excellent tutorials on all of these.

You end up with as many GPIO pins as you’re likely to need (and if not you could use a multiplexer to get even more). No messing with a purpose built board.
Just a thought 🙂