32 Output 74HC595 board
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32 Output 74HC595 board

This is a 32 output expansion board made up of four daisy chained 74HC595 8-bit shift register chips.  It can be controlled using SPI or with discrete outputs from your arduino or other microcontroller.  The default configuration is that the output enable lines of the four chips are connected to ground, but, by cutting the traces between the OE pads, the pins could be controlled externally. 

 

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