Using LCD1602 or LCD2004 with ESP32

Quickly learn how to use LCD1602-I2C or LCD2004-I2C with ESP32. Learn about 5V and pins of ESP32 and display text on display.
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Jump to different section of video by clicking on the time:
00:00 Start
00:40 ESP32 and LCD explained
05:10 Wiring and Pins explained
06:57 Code explained
12:11 Demonstration
Get the code for this video: robojax.com/L/?id=261
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[@lobbers66]

Thanks for this video. Solved my problem and learnt a lot. Your format is the best, lots of close ups and explanation. Thanks again.

[@robojax]

You are welcome. I am glad it helped.

[@kerimcelenka]

Thank you! It's very helpful!!!

[@johnbastin722]

One of the best explanations of the 1602/esp32 I have seen. Well done 👍

[@robojax]

Wow, thanks!

[@johnbastin722]

You mentioned the voltage in, I’d not using the usb connector. I have seen no one use this.

[@phoenixset6401]

I just cant imagine better explaination than this, quick, clear and you are ready to go with LCDs right after this video, no more needs. Thank you.

[@robojax]

Thank you for not skipping the ads and keep watching it. This will help me a lot.

[@mafketeltje1988]

this is "Monkey style" honestly, it works until you need to think yourself about how to innitialize, count etc. But you're right, just getting something on the screen (which most want) is this perfect...

[@manjifera]

Thank you so much for your solution for dim display on esp 3.3v

[@robojax]

you are welcome.

[@Microsoft-programmiererDe]

thank you, a really great tutorial.

[@robojax]

You are welcome. Thank you for not skipping the ads and keep watching them. This will help me a lot.

[@mick_hyde]

Very clear explanation, thanks.

[@robojax]

You are welcome.

[@y32code16]

just to clarify, powering a electrical component with 5v will make its logic at 5v. if your lcd is 5v powered and since the esp32 logic is 3.3v that means the sda and scl pins and all gpio pins on the esp32 can only handle 3.3v and CANNOT handle 5v you can degrade your esp32 this way or even fry it or damage it. consider using a logic level shifter (compatible with i2c) with the i2c pins from the lcd to the esp32.

[@chronobot2001]

Great video. It pretty much is just like the Arduino, you just need to know where the SCL and SDA pins are on this board.

[@muhammadadnanahmed8324]

Really it is best explanation of this video.

[@kshitizsharma4581]

Thanku sir this video helped me alot

[@robojax]

Most welcome

[@TaylenIsInsane]

Thanks for the very helpful video. I have a question, and that is, My ESP32 does not seem to have a 5v pin. I have read some articles that say you can use the VIN pin as a 5V pin, however some comments have some mixed reviews about that, and others say it has worked. Is it safe to do so? I do not want to fry my ESP32 😁

[@INGCANASO]

¡Gracias!

[@robojax]

Thank you very much.

[@koshan12]

nice video as always. btw at 1:10 you already have a video for the last one or will you have a video ?

[@robojax]

Thanks. Yes the video for that is coming soon.

[@yasinakar2350]

Aleykum selam tesekkür ederim

[@cocoon-bike]

Hi Robojax, very well explained. Nevertheless I am not yet successful. What I miss (maybe because I am still a beginner at MicroPython), is the reference in the code to the SCL and SDC connections to the ESP32 Pins (21 and 22). Furthermore, the lcd.begin() command is not accepted by the IDE compiler. Any hint?

[@robojax]

I mentioned that you need to install the library.

[@MrPaulw517]

Hi Robojax, I have successfully driven an I2C I Ii I have driven a non I2C 16x2 LCD with an ESP DEV board. However, I have not been successful driving it with a ESP Mini board???? Any suggestions would be appreciated.

[@robojax]

Hello, this is very simple . I am not sure about board you are trying to use but just find the SDA and SCL pins and it will work.

[@soulstice555]

Hi I have a question! When you say if you bring the wire in the breadboard you can connect to up to 128 devices, you mean with one esp32 i can connect many lcd?

[@robojax]

Hi, Yes exactly you can control that many devices .

[@ezem90]

Hi ! great tutorial, but i have a question... If you put Vdd to 5V; the output logic in SCL and SDA pins (0 to 3.3V) will not cause troubles ?? im asking this because I've seen the PCF8574T datasheet and the minimum HIGH level input voltage is 0.7Vdd (3.5V for Vdd = 5V) .

[@robojax]

the supply voltage and logic voltage are different. so don't worry. the display will work without issue.

[@citakis1277]

@@robojax This information was exactly what I was looking for.

[@zeamers3108]

Hi, can you do a countdown timer tutorial on a lcd 16x2 please

[@robojax]

Hi, In the provided code, we have int count =0; change it to int count =1000; and change the line count++; change it to count--; and it will count down from 1000

[@noedger]

Hi. I know this is old but I need some advice. Got my screen working with your tutorial but adding a rotary encoder button seems to be a problem. As soon as I declare the encoderbutto pins the screen does not work. It only displays all blocks of pixels lit up. Can you assist.

[@robojax]

Hi, you can learn it from this video kzbin.info/www/bejne/bKm5fZWEodJ-Y8k

[@studiomaquette8146]

Hi guys I don't have the libairi by Franck do you have an alternative.Thanks

[@robojax]

The library is provided. you just download and install it. There is a link under the video or shown in the video.

[@samanedu]

Greetings, thanks for the tutorial. Is there a way to tell the lcd.init () function that the display is connected to the alternate I2C GPIO 18 and 19? Because I am using a TTGO T-CALL ESP32 SIM800L module and the default I2C port (GPIO 21 and 22) is compromised

[@robojax]

You are welcome. I have not tried it, but first include "Wire.h" and then inside setup if you use Wire.begin(I2C_SDA, I2C_SCL); Wire.begin(15, 16); it should work.

[@samanedu]

@@robojaxThanks for the prompt response. I solved it by starting a second I2C bus with the instruction Wire1.begin (18,19) and I edited the LiquidCrystal.cpp library replacing everything (Wire) said by (Wire1). It is an extreme solution but I could not do otherwise.

[@samanedu]

I meant LiquidCrystal_I2C.cpp (new version running for ESP32)

[@robojax]

good to know you resolved. 😊

[@rtufino]

Hi @@samanedu! Can you send to me the link to LiquidCrystal_I2C library? I'm trying with different examples but my circuit doesn't work.

[@qzorn4440]

hi, my new lcd2004-i2c display project is with a Lilygo ESP32 CAN RS485 Modbus SD-card with limited pins IO_05,12,18,25,32,33,34,35... wish me luck and thank you.

[@robojax]

Good luck.

[@altitude1039]

Thanks for sharing! Where did you get that little LED voltmeter? I could use a few of those for my projects.

[@robojax]

Hello, sorry for late reply. I just got the links from another video and put them in the description for voltameters.

[@hagory85]

Buenas , en primer lugar excelente trabajo… podrías pasarme el enlace de la librería?

[@robojax]

Hi, the link is in the description well the video.

[@DirtNerds]

I can never get your videos to load would love to see what you are doing.

[@robojax]

Sorry. What is the problem?

[@melissaitzelcruzantonio4269]

puedo conectar Vin de mi esp32 al VCC del lcd? no causa problemas? Mi esp32 no tiene 5V, solo tiene 3.3V y Vin

[@robojax]

La pantalla LCD necesita 5V. no funcionará con 3.3V

[@2020gaurav]

Is it possible to take 5 volt for LCD from external source rather then ESP32 VIN pin ?

[@robojax]

5v is just voltage , sure possible

[@AndrewMurphy1]

I just purchased the longer esp32 boards and when I connect up the LCD to the required pins the board appears to not get enough power to light the LCD backlight and the red light on the esp32 just keeps flashing. Is this a known issue or is there something I'm doing wrong here? Thanks

[@robojax]

Hell, I am not sure where you have connected the 5V of LCD, make sure it is connected to 5V and it will work. Use multimeter to measure the voltage.

[@AndrewMurphy1]

@@robojax Solved it. Changed the ground pin. I was using the ground pin directly next to the 5V originally, switched to the one the opposite side of the board.

[@kystuart1413]

hi sorry how do you count down from a certain number that u can set?

[@robojax]

Hi, you can learn it from this counter video kzbin.info/www/bejne/a3Kcm4N6atOIedk but instead of 0 at start, set your number like 100 and then instead of ++ which increments, use -- to decrements the value.

[@florent9555]

Does the SDA and SCL have to be connected with G21 and G22? Could I use G25 and G26 instead?

[@robojax]

you haven't watch the video fully. please watch it. I can't watch it to answer your question.

[@florent9555]

@@robojax I have watched the video. You do not explain if it is possible to use other pins than G21 and G22. Or what impact it has when choosing different pins. Edit: randomnerdtutorials.com/esp32-i2c-communication-arduino-ide/ The ESP takes quite some space if you only use one normal breadboard. Without using 2 Breadboards you have to rely on just on side of the esp thats why I asked you this question but it is answered now

[@robojax]

I am glad you found the the answer. good luck.

[@dariosouza8956]

Ola meu querido, acompanho seu videos, estou tentando compilar o codigo com LCD 20x4 I2C com esp 32 e da a seguinte mensagem: invalid conversion from 'int' to 't_backlighPol' [-fpermissive] estou usando a biblioteca: #include poderia dar uma dica onde esta o erro?

[@robojax]

please use the library I provided. it should work.

[@ricadostephane9529]

thank you Sir for this video. please can i have the circuit diagram for this?

[@robojax]

I have explained the pins and then mentioned them one by one. you can draw them using Fritzing a free software here fritzing.org/

[@MXx222]

Hi, I am receiving this error while uploading code to my esp32. kindly if anyone can guide "invalid conversion from 'int' to 't_backlightPol' [-fpermissive]"

[@robojax]

Hi, you must have changed the code, try the provided code. once it worked, then customize it.

[@LumingMotion]

Is it possible to use micropython instead of liquidcrystal? And if it is, could you possibly do a video on it?

[@robojax]

The library sends specific command to display. If you can re arrange it for other purposes, you can do . Modify the library.

[@LumingMotion]

@@robojax Thanks for the tip!

[@AngelPufahl]

invalid conversion from 'int' to 't_backlightPol' [-fpermissive] im having this problem

[@robojax]

You must be doing something wrong or have not installed library or modified the code.

[@J-s0n]

Where is the library for the lcd?

[@robojax]

when video starts it says "You can get the code for this video by clicking on the link under the video in the description which will take you to robojax.com slash learn slash arduino". Perhaps you escaped the video.

[@j.n.5523]

@@robojax I think, it is unclear that the "ESP32 Github repository" is the library link.

[@rtufino]

@@j.n.5523 @Robojax In your links doesn't show the link to library

[@RTOHIO]

When I tried compiling this sketch it gave me an "Exit status 1 'LiquidCrystal_I2C' does not name a type. Same message I got when I tried t compile another sketch that was written and proven right in front of me. Do you know why I get this message? I would be very happy if you could help me. Likewise if one of your subscribers knows and could answer my post. Really like your approach and video style.

[@robojax]

Hi, you are getting the error because you are skipping the video and not watching it fully. It has been explained it. Just watch skipping, and follow the instruction. it will be resolved. I have also updated the page with more details to help you better.

[@RTOHIO]

I have solved this problem. Please tell me the source of your LiquidCrystal_I2C.h so I can obtain a copy to compare it with the library that would not work for me. This community of ARDUINO/esP32 sharing knowledge is wonderful. Thanks for all the time you put into making these videos.

[@robojax]

I have included all resources and related video and contents in in the same page. Please visit the page where the code is provided. you will see anything that is related to this including the LCd library. I do this for all my videos.

[@nagarava]

I want projects on esp8266-01

[@robojax]

It is coming in the next few days. Subscribe so you know.

[@kiran12n]

Compressed 3072 bytes to 128... Writing at 0x00008000... (100 %) Wrote 3072 bytes (128 compressed) at 0x00008000 in 0.0 seconds (effective 501.6 kbit/s)... Hash of data verified. Leaving... Hard resetting via RTS pin... It says Done Uploading. I have made all the connections as described in the Video but in RG1602A it's not displaying. Please help me

[@robojax]

what is this? Error? it should have been clarified. what is RG1602A? is it something different? LCD1602 is how I know it. Please upload this I2C canner robojax.com/learn/arduino/?vid=robojax-I2C-scanner into the ESP32 and if your wiring is good, you should see the I2C address.

[@AnarchyCookie]

You might have the same problem as I had. There is different libraries for the LiquidCrystal_I2C. I used a lot of different ones and it would not show any text. The library that worked for me is this one here: github.com/fdebrabander/Arduino-LiquidCrystal-I2C-library The difference is that in this library the bits get moved 4 places to the left. Try it and see if this works for you.

[@dijuathomas5955]

LiquidCrystal_I2C liberary link

[@robojax]

It you watch the video, in the first 30 seconds it will tell you where the code is or see this instruction snipboard.io/EG4O2l.jpg

[@mgabiel]

no funciona

[@robojax]

Please watch this first kzbin.info/www/bejne/Y16pm2uHedF6q7M and then this video kzbin.info/www/bejne/p2q8dJJ9i62sa6M