Hi guys, never really posted on an Electronics site before but wondered if you could help me here. I've been given a project for college (scottish college not american college), Our project is to drive a switch reluctance motor from a 5 volt, 12 volt, 1 bit ring counter (100, 010, 001), ive peiced together a little MSP of what its ment to look like but theres a few gaps im not to sure about.
my question is Mainly surrounding What is happening in this particular part of the circuit im confused with, it involves ''floating'' - which im not sure about at all. also ''pull up resistors'' im not really comfortable with them in this either exactly.
Before i found this part out i had no idea i needed the 12v supply with a pull up resistor and earth there, i assumed that current would just flow into the gate opening it allowing current to flow through the coil. an opto coupler being a 3 prong device i belive?.
So basically why wouldn't it work without the Pull up resistor and floating earth?, Whats the pull-up resistor doing exactly?. Ive tried looking some of this stuff up but its hard to pin down the answers to my questions.
I will have missed out some details to the circut maybe. ill fill in the blanks best i can if it will help you answer, Please and thank yous .
my question is Mainly surrounding What is happening in this particular part of the circuit im confused with, it involves ''floating'' - which im not sure about at all. also ''pull up resistors'' im not really comfortable with them in this either exactly.
Before i found this part out i had no idea i needed the 12v supply with a pull up resistor and earth there, i assumed that current would just flow into the gate opening it allowing current to flow through the coil. an opto coupler being a 3 prong device i belive?.
So basically why wouldn't it work without the Pull up resistor and floating earth?, Whats the pull-up resistor doing exactly?. Ive tried looking some of this stuff up but its hard to pin down the answers to my questions.
I will have missed out some details to the circut maybe. ill fill in the blanks best i can if it will help you answer, Please and thank yous .