quick question about SPI and 74HC595

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1

All,

I have a project where I need to open 28 little doors, via 28 little solenoids – not at the same time.

I’m new to Arduino and learned about SPI and 74HC595.

I’ve assembled LED projects and understand most of the concept, but I have a few quick questions.

Does 1 or 2 , or more, 74HC595 allow you to address a particular location along all those pins? Out of 32 pins, supposed I wanted to pull pin 12 high for 1/10 seconds. Can that be done?

Can I look at each pin to see its state? Is it HIGH? Is it LOW?

Tony Perry

Posted over at Arduino too

2

Using the 74HC595 shift register breakout could work. You’ll have to ensure that the current consumed by each solenoid is less that 35mA as per the datasheet: https://cdn.sparkfun.com/datasheets/Bre … 4HC595.pdf

You could view their states, but the simplest way would be with LEDs but that drains more current.