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I2C LCD1602

i2c_lcd1602

  • GND: Ground

  • VCC: Voltage supply, 5V.

  • SDA: Serial data line. Connect to VCC through a pullup resistor.

  • SCL: Serial clock line. Connect to VCC through a pullup resistor.

As we know, LCDs and other displays greatly enhance human-machine interaction. However, they share a common drawback: connecting them to a controller requires multiple I/O pins, which can quickly consume the available ports and limit the controller’s ability to perform other functions.

To address this issue, the LCD1602 with an I2C module was developed. The I2C module features a built-in PCF8574 chip that converts I2C serial data into parallel data, allowing the LCD to operate while significantly reducing the number of I/O pins required.

I2C Address

The default address is basically 0x27, in a few cases it may be 0x3F.

Taking the default address of 0x27 as an example, the device address can be modified by shorting the A0/A1/A2 pads; in the default state, A0/A1/A2 is 1, and if the pad is shorted, A0/A1/A2 is 0.

i2c_address

Backlight/Contrast

Backlight can be enabled by jumper cap, unplugg the jumper cap to disable the backlight. The blue potentiometer on the back is used to adjust the contrast (the ratio of brightness between the brightest white and the darkest black).

back_lcd1602

  • Shorting Cap: Backlight can be enabled by this cap, unplugg this cap to disable the backlight.

  • Potentiometer: It is used to adjust the contrast (the clarity of the displayed text), which is increased in the clockwise direction and decreased in the counterclockwise direction.

Example