Optocoupler interface with pic microcontroller

[M.Imran Ali]

Hi
I want to interface an optocoupler with pic18f452 I have orient 817C in my hand . Can any body help me?

 

[abhichaotic]

It's very easy, connect any port pin you desire to pin number 1 of 817c through a resistor, and pin number 2 to ground. Limit the current in input LED of optocoupler to 10mA by the resistance and output of it is an npn transistor, connect it as you require.

 

[Tahmid]

Do you want the PIC to drive the opto-coupler? Or does the PIC receive input from the opto-coupler?

To drive the opto-coupler, connect a current limiting resistor from PIC pin to PC817 LED anode (pin 1) and connect PC817 LED cathode (pin 2) to ground. Use the transistor side collector and emitter as you would use a standard NPN transistor. Limit the current to a value within limits of both the PIC and the PC817. 10mA is good. So, resistance should be (5-1.4)/0.01 = 360R. So, you can use a value between 330R and 560R.

Hope this helps.
Tahmid.

 

[M.Imran Ali]

Thanks to all