Arduino UNO 40 LEDs with PCF 8574 || Arduino LED controling || Arduino coding || LEDs blinking.

Arduino UNO codes for 40 LEDs with PCF 8574 I2C IC I/O Expander
Arduino code
drive.google.com/file/d/1I3iU...
Schematic
drive.google.com/file/d/1o3q8...

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