Components:
Blue 20 x 4 2004 LCD display + I2C serial interface backpack; 2004 lcd screen can display 4-lines x 20-characters with built-in industry standard HD44780 equivalent LCD controller. Default Address: 0x27 for PCF8574T chip; 0x3F for PCF8574AT chip; please check which chip you have on the i2c interface. (Before you upload the code to the control board, please download the LiquidCrystal_I2C library.)
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Four Pins:
VCC, GND, SDL, and SCA are used for connecting Dupont Line or IIC dedicated cables.
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Display Function:
Can be used to display real time clock, temperature, humidity, etc. A potentiometer is also necessary to adjust the contrast. Working Voltage: Only 5V.
Applications:
Commonly used in copiers, fax machines, laser printers, industrial test equipment, and networking equipment such as routers and storage devices.