Via John Davis on YouTube.
Using a Raspberry Pi 3 with my custom industrial 24V interface board (the Rhubarb OpenPAC) to do quality control on a rebar production line.
The board was designed using KiCad and manufactured at OSHPark. Reflow and component mounting is done in my shop.
The board powers the RPi via a protected 24V power stage utilizing a TI industrial-grade buck converter.
The 12 inputs are 10-24VDC, optically isolated and filtered.
There are 2 relay outputs (up to 2A/ 120V) and 2 MOSFET outputs (up to 50mA).
Also included on the board is a real time clock.
All components are chosen based on high-temp industrial usage.
The software stack uses a custom program written in C that monitors the GPIO and logs events to a SQL database. The front end is Iceweasel in Openbox displaying a PHP/JS web page as the HMI (Human Machine Interface).
Each Friday is PiDay here at Adafruit! Be sure to check out our posts, tutorials and new Raspberry Pi related products. Adafruit has the largest and best selection of Raspberry Pi accessories and all the code & tutorials to get you up and running in no time!