1/30/2024 0 Comments Arduino wire library for esp32The first thing we need to figure out for ESP32 I2C LCD Interface to work is the I 2C pins of ESP32. Just plugin the I2C LCD Module at the back of the 16×2 LCD and make connections between the microcontroller and the I2C LCD Module. ![]() ![]() So, you don’t need any additional connections. This I2C LCD Module includes the POT to adjust the contrast of the LCD and pull-up resistors for SDA and SCL lines. If you notice the board layout and pins of this I2C LCD Module, you can observe that it is a modified version of the regular IO Expander Module, which is also based on PCF8574 IC. A Brief Note on PCF8574 I2C LCD ModuleĪs the name suggests, the PCF8574 I2C LCD Module is a PCF8574 IC based module designed to convert regular 16×2 (or 20×4) character LCD Displays in to I 2C based devices i.e., instead of using 8-bit or 4-bit parallel interface to send data, we can use I 2C bus to send data to the display. The PCF8574 I2C LCD Module is designed to overcome this drawback. Using that many pins of a microcontroller just for a simple character LCD Display is not desirable especially if you are designing a project with lot of sensors and devices connected to the microcontroller. This is not even the 8-bit mode but reduced 4-bit mode (add another 4 GPIO pins for 8-bit mode). The main disadvantage of 16×2 LCD Display is it requires at least 6 GPIO pins of a Microcontroller to function properly. But for displaying simple text and number, all we need is a 16×2 or 20×4 Character Display. There are many display devices like OLED Display, 128×64 Graphical Display, Nokia 5110 Display etc. Finding the Slave Address of I2C LCD Module.
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