step by step : Nodemcu Esp8266 I2C lcd display

In this video we are going to see how we can connect I2C devices to the Nodemcu and code via the Arduino ide
feel free to like and share this video
The code:
pastebin.com/raw/NXT6fTtF
The arduino settings:
board: nodemcu 1.0 (esp-12e module)
upload: serial
cpu freq: 80 MHz
flash size: 4m (3m spiffs)
upload speed: 115200
port: the com it is sitting on
programmer: avrisp mkII
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/ @marcoarduinochannel
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/ marco_arduino

[@Musitdjan]

Hello from Ukraine. I suffered for 3 hours (I transfer from Arduino to NodeMCU), I could not start the display. Thanks to your video, it started, I did not know about D1, D2 contacts.

[@MarcoArduinochannel]

Great

[@lmramirezjr]

This really helpful!

[@daimyunus7387]

May I know the link of the Liquid_Crystal library because until know i cannot display anything on my lcd albeit after using various lcd i2c library. I already using i2c scanner and yes the serial monitor showed me the address. I think the library is the culprit for my fails.

[@mTnX1]

What settings do you choose in the Arduino compiler? did you change the card setting?

[@MarcoArduinochannel]

+Matan Yehoshua board: nodemcu 1.0 (esp-12e module)upload: serialcpu freq: 80 MHzflash size: 4m (3m spiffs)upload speed: 115200port: the com it is sitting onprogrammer: avrisp mkII

[@mTnX1]

+Marco Arduino channel Thanks יש לך אחלה ערוץ 😜

[@hamz2900]

bro can help fix my problem when to upload the code the error show invalid conversion from 'int' to 't_backlightPol' [-fpermissive]

[@stevepujara334]

So we can use this as a arduino are there any restriction. i wish to use it with MFRC522 would it work

[@MarcoArduinochannel]

+Bad Bat Do notice that it is 3.3 v and the adc is 1.1 v

[@EZtech]

So the first nodemcu worked fine with the lcd at 3.3volts, but the second one only worked at 5 volts. Is that correct?

[@MarcoArduinochannel]

+Revelation612 The brightness of the display is better on 5v but you need to use a logic level converter

[@Ed19601]

In all fairness, I haven't seen it work on the first 2 nodeMCU's that you showed and that had the LCD wired up to 3.3 Volt (till 2:05) the one afterwards, on the breadboard is as you say connected to 5 Volt. It is not a matter of the display being brigther, it is a matter of not seeing anything on a 3.3Volt fed LCD. I haven't seen it work on 3.3Volt anywhere yet

[@MakerView]

I know someone could help this, in my case for the RGB LCB don't power on putting in the VIN the VCC, I tried puttin in the VV pin and it works! :D

[@aboutcomp4825]

Thank you very much sir your already save my life LoL.

[@MarcoArduinochannel]

+kiadtisak buangam Great !!!

[@aboutcomp4825]

Marco Arduino channel I spent alot time to connect RTC mudule to my Nodemcu1.0 i try to search google many time and filnally you tould me i connect it with swap SCL and SDA pin lol.

[@MarcoArduinochannel]

+kiadtisak buangam Why do you need an RTC with your nodemcu ? Simply go to a time server and get the time

[@aboutcomp4825]

Marco Arduino channel I would like my Nodemcu to use real time clock in offline.

[@Ergelol0]

if we use d3 d4 is it works?

[@ElectricalZoon]

error : invalid conversion from 'int' to 't_backlighPol' [-fpermissive]

[@bentolima8516]

good evening My name is Bento from Brazil, I'm starting to learn now and if you can help me I would be very happy. I plan to use a local network with 18 (ESP8266 12e) and each a temperature and humidity sensor (DHT11), a current sensor (TCS-013) and a relay module 4 channels. All this I would like to come in an excel spreadsheet, excel because I would use this information and create a button to turn on and off the relay. Can you help me? Thank you.

[@Ed19601]

easiest is to have the ESP8266 upload yr data to say Thingspeak and you can export it from there. But you may as well do it on your own webserver as well. how you wantto use the excel info to turn on a relay via a button is completely unclear to me

I get error I2c_LCD_Test_2x16:14: error: 'class LiquidCrystal_I2C' has no member named 'init' how do i fix plz?

[@PauloMorgadomorgapa]

i get the error

[@keshavdk3080]

I have interfaced Arduino Uno with ESP8266-01 and 16*2 LCD .I want to control LCD from webpage. I am new to server,web side.Now the webpage has two text box and submit button. When i type text on webpage and click on submit button ,text should appear on LCD. I am stuck in web part . How to communicate web part and Arduino. I tried HTML with GET method . But not working .Some suggested saying try Php. Can you please help.

[@Ed19601]

There are plenty of examples on how to turn on an LED with the Arduino over the web (with GET). If can turn on an LED, can turn on a relay I think?

[@Dzahmega]

dude have you figure out the solution? im using espresso lite to control lcd from blynk app, but my code doesnt works

[@Ed19601]

I dont know blynk, or at least I have no experience with it but if you enter a command on a webpage and use a post or get, then on that 'new' page that is generated you can read the command and then issue new commands e.g. to your LCD I suggest that you google a simple 'switch a led on/of via a webserver' and instead of switching an LED you send a command to yoiur LCD

[@santamanyugujari7424]

How can we run esp8266 for 24*7day.i burnt mine nodemcu in one night.

[@MarcoArduinochannel]

+Santamanyu Gujari You had a faulty unit or you gace to the pins 5 volts or you took too much current from the pins.