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Use testing mode in order to show "hello world" on the screen at arduino startup : Verify contrast (it could be too low preventing you to see text), you can adjust contrast using the blue ...
HD44780 LCD connected to PCF8574 I2C. ... HD44780 LCD connected to PCF8574 I2C. This paper presents a library for Arduino that allows interfacing a 16x2 LCD display with the HD44780 controller via the ...
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