Hd44780 lcd pinout5/1/2023 You can end up having maybe 5 LCDs connected to your microcontroller using only 2 pins If you’re using that I2C module. Not only that, actually the 2 pins of that I2C bus can still access so many other I2C devices on the exact same bus. This will reduce the GPIO pins requirement down to only 2 pins (the I2C pins SDA & SCL). The second most commonly preferred option is by using the I2C module with your LCD. However, in some projects, it can be a good option in case you don’t need the extra GPIO pins anyway. In the case of our ESP32, it can be really annoying to lose 6 GPIO pins for adding only 1 LCD module to the project. The only downside to using the bare 16×2 LCD display is that it requires 6 dedicated GPIO pins of your microcontroller. It’s a very cheap, easy to use, and reliable option to display strings of text/numbers to your system’s users.
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