![]() ![]() If you didn't end up using the hd44780 library, you may still want to have a look at using it as it offers a plug-n-play capability for the i2c lcd backpack LCDs. ![]() The hd44780 library and the included I2CexpDiag tool is far superior to the i2cLCDguesser code which was a tool I wrote to help getting fm's LiquidCrystal_I2C i/o class working.įrom looking at the photos it is likely you originally had soldering issues in addition to the maladjusted contrast pot. If this passes, there are no issues with the i2c signals, no soldering issues on the backpack pins, and the internal LCD RAM is working properly. It is a diagnostic tool that will test the i2c signals then run a full memory test on the internal LCD RAM. The first sketch to run on that type of LCD device when using the hd44780 library is the included I2CexpDiag sketch. I can get it to backlit on and backlit off but that's all. If you guys have any clues I'll be very grateful!īut still, when I use Bill's hd44780 Library and run an hello world, evrything runs without any errors but the screen doesn't display the text message. Or, the configuration of the pins in the code, to which I known next to nothing, is wrong. My best guess is either they're are very poorly soldered and some pins are not connected. Void loop() /*-( LOOP: RUNS CONSTANTLY )-*/Īttached you will find pictures of the pin from I2C module connected to the LCD before and after I soldered them. NOTE: Cursor Position: CHAR, LINE) start at 0 Lcd.backlight() // finish with backlight on Lcd.begin(20,4) // initialize the lcd for 20 chars 4 lines and turn on backlight LiquidCrystal_I2C lcd(0x27, 2, 1, 0, 4, 5, 6, 7, 3, POSITIVE) // Set the LCD I2C address Set the pins on the I2C chip used for LCD connections: ![]() set the LCD address to 0x20 for a 20 chars 4 line display ![]() * Example Software Sketchīackpack Interface labelled "LCM1602 IIC A0 A1 */ Same issue, or nothing happen and the screen stays lit, or if there's a blink configured it will blink and nothing else. I also used the examples in other tutorials and provided by default with the library. I used the code provided in the tutorial and simplified it to its minimum to make sure this is not a code issue. I am referring to that part LiquidCrystal_I2C lcd(0x27, 2, 1, 0, 4, 5, 6, 7, 3, POSITIVE) I tried every pin configuration for addressing the above mentioned tutorial contains.I scanned the I2C address which is 0x27 (confirmed multiple times).The jumper at the back of the I2C module is placed properly and I tested without it (it cuts the power.I wiped clean any LCD library from the environment, user's and IDE's and downloaded the latest.The jumper cables are properly set VCC to 5v, GND to GND, SDA to A4 and SCL to A5.This seems to be exactly the type of hardware I have.I found this tutorial which is around for a long time and helped a lot of people to make this work. I've applied many of the getting started tutorials you can find on or. All I can get it to do is initialize and blink (basically tell the display to backlight on and backlight off) When it comes to displaying a simple print() the screen stays lit as per the last instruction before the print function and does nothing else. So I'm trying to make a LCD 2004A linked to a I2C MH chipset and an Arduino Uno display an simple hello world. I know my way around IT but I'm pretty new to anything electronic especially when it comes down to the lower layers of things. I've been searching, reading and tinkering around for almost 5 hours now, so I'd thought I would ask you fellows. First, thank you in advance for the time you'll spent reading my question. ![]()
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