Comments on: How to Use I2C LCD with ESP32 on Arduino IDE (ESP8266 compatible)

By: Sara Santos

Sara Santos — Mon, 10 Nov 2025 15:18:13 +0000

In reply to d.n..

Hi.
that’s not an error.
It’s just a warning. If you don’t get any other errors, it should run just fine on the ESP32 or ESP8266.

Regards,
Sara

By: d.n.

d.n. — Mon, 10 Nov 2025 13:20:57 +0000

In reply to Sara Santos. I got the same Warning: WARNING: library LiquidCrystal_I2C claims to run on avr architecture(s) and may be incompatible with your current board which runs on esp32 architecture(s).

By: Bhaaskar R

Bhaaskar R — Wed, 10 Sep 2025 18:45:02 +0000

Hi,
Is it possible to run an I2C LCD with 3.3V? If possible, please explain in detail

By: Gaelen

Gaelen — Fri, 29 Aug 2025 18:36:50 +0000

This was a great tutorial – very clear and reproducible!

I was having an issue where I couldn’t see any text, but scrolling down to the comments showed me that I needed to connect to the VIN 5V pin instead of the 3V3 pin. Perhaps boosting this will help someone else if they’re having trouble.

By: Sara Santos

Sara Santos — Fri, 06 Jun 2025 09:47:24 +0000

In reply to irahza.

Hi.
That is just a warning message. Not an error. It should compile and run nonetheless.
Regards,
Sara

By: irahza

irahza — Fri, 06 Jun 2025 07:03:16 +0000

i found thisi massage when verify :

WARNING: library LiquidCrystal_I2C claims to run on avr architecture(s) and may be incompatible with your current board which runs on esp32 architecture(s).

By: Fedia

Fedia — Sun, 23 Mar 2025 13:58:30 +0000

j’ai un problème d’affichage de lcd il affiche des chiffres et lettres aléatoires après le téléversement et je suis sur que l’alimentation , le branchement et même la bibliothèque sont tous juste. que peut être le problème. j’utilise la carte ESP32-WROOM-32

By: Oleg Boldyrev

Oleg Boldyrev — Fri, 21 Feb 2025 12:28:37 +0000

Hello!
I’m connecting a 1602 display with I2C module to a ESP32_devkitc_v4. When I connect the LCD to 3.3v, it glows but doesn’t show characters. When I connect it to 5v (as the LCD expects), it shows characters for a while but very soon begins blinking and then stops showing the text. When I measure the voltage on sda and scl pins, I see something to the tune of 4v, which is far too high for ESP32. They say it’s because the LCD pulls up the I2C lines to it’s Vcc. In other words, there is a voltage mismatch between the display and the uc.
Don’t you experience this issue?

By: Sara Santos

Sara Santos — Sat, 30 Nov 2024 10:28:07 +0000

In reply to Bill.

Hi.
You need to check the wiring and I2C address of the device.
https://randomnerdtutorials.com/esp32-i2c-scanner-arduino/
Regards,
Sara

By: Bill

Bill — Fri, 29 Nov 2024 23:09:03 +0000

In reply to Alnoor Ratansi. i use this board ebay.com/itm/166963753682?var=466649040470 but I get error No I2C device attached but the display is attached