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Month: January 2016

Arduino: PLC or PAC

The traditional Programmable Logic Controller (PLC) is used in process controls and Programmed in Ladder Logic. A more recent evolutionary step is the Programmable Automation Controller (PAC), which is typically programmed in C/C++, and has analog, digital, and communications functions

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Using a 4×4 Keypad

Part 1 – I was working on a project for someone who needed a keypad for password entry. I couldn’t find my 3×4 keypad, but found a 4×4 keypad in one of my parts boxes. I modified the example sketch

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