The module features a controller chip handling I2C communications and an adjustable potentiometer for changing the intensity of the LED backlight. LCDs incorporate a small add-on circuit (backpack) mounted on the back of the LCD module. The character LCD is ideal for displaying text and numbers and special characters. We offer both a 2 x 16 LCD along with the larger 4 x 20 LCD. Using an I2C interface, only two connections for an LCD character display are possible with stunning professional results. Adding an external display would typically require several of the limited I/O pins. The ability to interface to external devices readily is very enticing, although the Arduino has a limited number of input/output options. The Arduino family of devices is features rich and offers many capabilities. Dayton Hamvention Previous Years Vendors.
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