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Topic: shift register 74HC595 goes crazy on bootup (Read 826 times) previous topic - next topic



I just learned how to control many LEDs with help of chained 74HC595 swtich registers. However, on bootup of the arduino all LEDs are uncontrollable lit. Somewhere else someone mentioned that a pull down resistor would help. Is this the solution? If yes how would I integrate such a resitor?

Many thanks!


Is this the solution?

No - a pull up resistor

If yes how would I integrate such a resitor?

From the output enable pin (pin13) to +5V about 3K3. Then connect this pin to the arduino and set it low when you want the outputs to be active.

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