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“This instructable is to build up a laser driver from an Arduino based board for a 5 mW Adafruit laser. I chose an Arduino board as I might want to control the laser remotely from my computer in the future …

“Using the Galileo II and ANSI C, demonstrate how to drive the MCP23017 IO Expanders 16 general purpose outputs, themselves driving four 74HC4511 seven segment display drivers. The 74HC4511 accepts as inputs a 4 bit binary encoded decimal value. This …