Back to the base project... The Electronic Referee

 

So if you have not watched the first video, go do that now and then come back to this one, you can find it here Driving BIG loads with your micro controller - no isolation

 

This video extends what you will have learned from the previous blog and adds an OPTO Isolator into the mix, for added safety and to protect the microcontroller from EMF and other bad things

 

The OPTO isolator provides over 4KV of isolation and is easily driven by a 3V3 or 5V microcontroller

 

using an OPTO Isolator also simplifies creating a circuit for HIGH side or LOW side switching, it has the same components in each case but simply connects them in a different way... very cool

 

Circuits have been tested on  a breadboard and built into a prototype Launchpad Booster pack for my electronic Referee project The Electronic Referee

 

use as you like, enjoy

 

 

 

 

P1010211.jpg


This is a link to the OPTO Isolator I used http://www.vishay.com/docs/83621/ild55.pdf

and this to the P Channel FET:  http://media.digikey.com/pdf/Data%20Sheets/Toshiba%20PDFs/TPC8114.pdf

 

This is the final circuit used for the electronic referee

here is the next video, How to read BIG things using OPTO Isolators Sense BIG things with your Launchpad or Arduino, OPTO Isolated inputs.