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| Opto-isolators for dummies | |||
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| Posted by: hjens56 ® 03/01/2007, 20:51:53 Author Profile eMail author Edit |
I'm a mechanical engineer looking for some help with an electrical engineering problem. I have a sensor that outputs a CMOS logic signal and I am trying to read it from a parallel port on a PC with an optoisolator in between. I have no idea how I should go about choosing the opto-isolator or how I should create the circuit. I think the attached circuit will work, with the sensor being represented by the left side of the circuit and the input to the PC by the right where V2 is 5V. This should pull the read pin on the port low when the signal from the sensor is high and vice versa. Is this correct and if so, how should I choose the correct opto-isolator? Thanks in advance.
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| Re: Opto-isolators for dummies | |||
| Re: Opto-isolators for dummies -- hjens56 | Post Reply | Top of thread | Forum |
| Posted by: Bruiser ® 03/02/2007, 01:22:19 Author Profile eMail author Edit |
Looks good - when S1 closes you'll 'pull down' on your resistor. Choosing an isolator, make sure it has the voltage rating that you're trying to isolate against, and make sure it's fast enough. If your sensor is only doing a few kHZ you'll be fine. Also you'll need to select resistors that are low enough to bias the input and high enough to limit the output current. Your parallel port input impedance will probably take care of the latter. |
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