Using LCD with Wemos D1 Mini ESP8266 with Arduino

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How to use LCD1602-I2C or LCD2004-I2C, Code and wiring explained and code provided

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Jump to different section of this video by clicking on the times
00:00 Start
00:37 Introduction
01:31 Preparing IDE for Wemos D1
04:03 Wiring explained
04:52 Code explained
09:56 Demonstration of running code

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Great video. Please note that your code does not compile "lcd, begin(): should be "lcd.init()".

I am using code to test a setup, in which I think the Wemos is faulty. It is running, but very slowly. at least 10 secs between counts. Any suggestions please?

tonyjohnson
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My monitor serie said: No I2C devices found. What can I do?

cesarespinal
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SOLVED....
Using a D1R1 the compiler Arduino:1.8.15 (Windows 10), give a error
invalid conversion from 'int' to 't_backlighPol' [-fpermissive]
Any idea?

fritss