Raspberry Pi-based SCADA prototype working

We are using a Rosemount model 3051S differential pressure transmitter to sense the pressure difference across a "baghouse" used to filter air vented from booths in a weld shop. The transmitter's 4-20 mA DC signal is sent through a 250 ohm resistor, producing a 1-5 volt DC voltage signal, which is sensed by the first analog input on a LabJack model T7 data acquisition unit. This data is then polled by a Raspberry Pi single-board computer running custom code (programmed in the "C" language, using the "libmodbus" library) and displayed in text form on the monitor.
This is very much a prototype system, put together hastily to demonstrate proof-of-concept. The final installation will be professional in quality.

[@fohdeesha]

Awesome to see you putting out videos again! Looks like your classes have been very busy. Something you might be interested in, many people are now running the pretty amazing AdvancedHMI application on raspberry PI's. They've got some pretty nice looking HMI's running under mono on the pi talking to plc's over ethernet and serial and all kinds of stuff. There's a big thread with instructions on the advancedhmi forum under "tips and tricks". Obviously in this application it would defeat the whole "learn to code" bit, but maybe helpful for a future application. Keep making videos!

[@qzorn4440]

this is a great educational project and is there a video on the software? thanks.

[@milofonbil]

Will you have the code for the Raspberry Pi available on GitHub so that it can be seen / shared with others following along? The Raspberry Pi could present that same data with a single-page realtime webpage using Angular.JS and Node.JS. The collected data could be stored into a Mongo database.