![]() ![]() On my MAC, I right clicked on the Arduino application file, and selected "Show Package Contents".Removing the jumper enabled the code to take control of the back-light. My i2c 1602 blue lcd display has a 2-pin jumper which says BLK and VCC.The PCF8574T details are here - PCF8574/74A | NXP Semiconductors (datasheet is a must read).Means EN signal of LCD is being addressed by P2 of the 8 bit (P0-P7) address bus (parallel). 8 pins from PCF8574T connect to the LCD display as follows (in this model of the board) :. ![]()
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