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  • 03/04/2014

    I used this with a Microchip PIC development board to interface to a 20x4 LCD display. With only 4 wires (including 2 for power) it's simple to set up and uses far fewer ports than the standard LCD parallel interface. As delivered the address pads A0 A1 and A2 are open but pulled high - so the I2C address is 0x4E. Ports P7,P6,P5,P4 of the PCF8574 interface to DB7,DB6,DB5,DB4 of the LCD Display. Port P3 is hard-wired to the backlight via a transistor: 1 = on / 0 = off. It's great that the backlight can be switched on and off via software with no additional hardware required. Port P2 is the display bit clock : E = 1 -> E = 0 active. Port P1 is R/W hardware Read/Write bit hardware : Read = 1 / Write = 0, so reading from the LCD display is possible, if required. Port P0 is RS Register Select : CmdReg = 0 / DataReg = 1. Display driver is HD44780 compliant. A great buy! I won't be interfacing to an LCD in future without it.

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  • 16/05/2015

    I bought some of these and found out that there are different models which need different pin configurations. Here is a beginners guide for the ones from Bangood: You need to download one library, and you are ready to enjoy LCDs on your arduino with only 2 Arduino pins occupied (plus GND and VCC). This little board saves you time and pins :-)

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  • 18/01/2019

    Good quality.

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  • 14/02/2021

    Successfully reached Morocco and with good packaging quality

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  • 09/04/2021

    nice product. its really helpful to reduce the pins needed on a lcd. cool to see that there is a jumper include to enable or disable the onboard led. can be helpful in low power situations. the product was not damaged in shipping and the quality looks great!

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  • 11/09/2020

    Received well in good order and well packed. Still need to test them

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  • 27/02/2017

    The I2C interface module works fine on my blue 1602 LCD module. The I2C address is 0x27 out of the box so remember to modify your code accordingly. There is a very clear description that can be found here: It clearly describes the different available versions of the I2C interface. The one I received was version 3. When I first connected it and run the sample code I adjusted for the 16x2 display it did not seem to show any information on the display. The root cause was the potentiometer on the I2C interface not to be setup correctly out of the box. I needed to adjust it to change the contrast and show the characters on the screen. So I am happy with this interface as it reduces the connection to only 4 wires (2 for the power supply and 2 for the communication).

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  • 20/08/2013

    After receiving item, I test it with good results. Runs fine.

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  • 08/07/2020

    Worked end at first attempt. Make attention to set appropriately the contrast on the trimmer: writings on display can appear so dim to made you think that it doesn't work. I searched for the address with an I2C scanner (code easily findable on Arduino site) and resulted for my item 0x27. To change address you need to solder jumpers on the A0-A1-A2 points near the trimmer. Worked on the first shot. Be careful to adjust the contrast with the trimmer, because the lettering on the display can be so flaky that it doesn't seem to work. Detected the address with an I2C scanner (can be found easily on the Arduino website) in my sample was 0x27. To change address you need to weld jumpers on the pitches A0-A1-A2 near the trimmer.

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  • 19/10/2018

    nice package

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