Here is my problem. I want to drive 5 74hc595, and 4 of them will drive 8 LEDs ( 32LEDs in total). Since supply current for hc595 is 70mA, it gives about 8.5mA PER pin with 360ohm resistors. How much current does a 74hc595 need? 20mA or 70mA? If 70mA, can 5V arduino pin supply 350mA? What is the m…

Arduino & 74hc595 question

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