Help with optoisolators

Thread Starter

ktnch

Joined Jan 19, 2011
22
Need some advice, got an arduino 2560 and looking to isolate the pwm 0-5v feeds, been looking at optoisolators to do this then feed the led drivers pwm from the isolator output again will need to be 0-5v

is the optoisolator best for this job ? guessing i cant use a simple blocking diode

cheers folks
kev
 

crutschow

Joined Mar 14, 2008
34,280
Opto-isolators can be somewhat slow, depending upon the type. What is the frequency of the PWM?

Do you need galvanic (ground) isolation?
 

Thread Starter

ktnch

Joined Jan 19, 2011
22
Sorry just need the arduino isolating from the led drivers had one go faulty and blew the arduino pwm output pin out
 

crutschow

Joined Mar 14, 2008
34,280
You should be able to use a resistor to isolate the driver sufficiently to prevent a failure from damaging the arduino. What is the driver circuit?
 

Thread Starter

ktnch

Joined Jan 19, 2011
22
Cool cheers, at which point n the circuit does the output attach to the pwm 0-5v to to the led drivers ?, also will this still isolate the arduino from the led drivers incase they go faulty ?
 

Thread Starter

ktnch

Joined Jan 19, 2011
22
Shall try that, are diodes any good for one way flow ? or will they simply smooth out the pwm signal

sorry for all the questions
 
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