Remeber that in real hardware setup, this number must be 0x27 instead The 0x20 is the I2C address for PCF8574 in proteus only, 4 is rows as the maximum limit of lines from up to down 20 is cols as the maximum limit of characters from left to right

You can refer to the table below to chabge the address from a default of 0x27 and/or 0x3F, to any required. The provided jumpers usually are labelled as A0-A1-A2. Also depending on the LCD manufacturer, there are LCDs with I2C interface that has pads or pins that can be jumpered to change the address.ģ. So in case it didn't display the writings,Ĭhange the address to see which one works.Ģ. For the I2C chip's address, the default is sometimes 0x27 or 0x3F depending on the setup. *Īrduino LCD I2C with PCF8574 chip On Proteus Tutorialĭatasheet: Crated by: ARDULECTRO, April 2020ġ. We all were noobs someday and were helped by good peolpe.įor the greater good and others with same question. It took me a while to figure it out so am posting here for anyone who might be struggling with the same issue. Use : LiquidCrystal_I2C lcd(0x20,16,2) for simulationĪnd LiquidCrystal_I2C lcd(0x3f,16,2) for real hardware The I2C address of the 8574 on proteus is 0x20

Pins 4,5,6 of the 8574 go to RS, RW, E of the LCD, while P4 to P7 connect to the LCD D4 to D7.Ī0, A1, A2 in my case are grounded (this give address 0x20 in sim not in real life) The correct way to simulate it btw is to add a PCF 8574 beween your arduino and the LCD. I am also new here, and stumbled upon this post, precisely for the same reason. A comment like yours will only scare people away. I agree also that this is not a proteus forum, however, jumping on someone who is new like that is not going to make the community grow, or make anyone any favours. It can also help debug when on the move with just your laptop available. You prefer the hardware approach so be it. While I agree with compiling, uploading and trying approach, simulating stuff, can at times (most of the time) save you a lot of debugging time, which is why it is a widely used approach in the industry. That 'crap' you refer to, is probably where the first arduino board was designed and developed !

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