An introduction to using them with microprocessors- ec. HOME > >. ELECTRONICS MAIN PAGE. Bookmark this on Delicious. Recommend to Stumble. Upon. This page introduces optocouplers to hobbyists, etc. It really doesn't matter if you are using an Arduino, a Raspberry Pi, a PIC..

• 141 thoughts on “ Raspberry Pi – Driving a Relay using GPIO ” Phil Lavin June 29, 2012 at 8:03 am. Knocked one of these up last night – works a treat.
• Electronic Circuit Schematics. Note that all these links are external and we cannot provide support on the circuits or offer any guarantees to their accuracy.

This page concentrates on how optocouplers can help in low voltage digital circuits. Optocouplers are elegant little devices with very little about them to . And they are . Consider your car: The engine is . If it dies, you just drift to the side of the road and stop. Your brakes are not fail safe.

They fail, and you're in trouble. In this page, we will consider how optocouplers can be useful both on inputs and on outputs. Simple optocouplers consist of an LED and a photo transistor, embedded within a bit of plastic. Often that . The following eight pin DIL package would have two independent optocouplers in it, for instance. The LED and phototransistor are not . Ddd Pool Best Of Billiards.

At the green blob, you will get a high voltage or a low voltage, depending (indirectly) on the state of the LED, itself determined by the state of the switch. You won't see the light from the LED..

The link will take you to the details, including prices and how to order. Why put an optocoupler on an microprocessor input?(I have discussed putting optocouplers on outputs further down the page.)A simple reason? You could use an optocoupler if you were uncertain about what you are doing. If you weren't sure that circuits you wanted to connect to an input were . If you did that, then many mistakes you could make would only ruin the quite cheap optocoupler.

The Bad Stuff won't jump across the gap between the LED and the photo- transistor. If you've used a socket for the optocoupler chip, always a good idea, then replacing it only takes a moment. That's one simple reason for using an optocoupler.

Sometimes the thing you want to use to make the input high or low isn't . Perhaps it is part of a circuit operating at some voltage which doesn't suit the microprocessor? The voltage can be whatever is handy.. Suppose the switch is going to be part of an anemometer on the roof of a building? Pushing 1. 2v through those long wires might make better sense. And, as lightning storms pass through, those long wires will be an antenna.. Would you rather an optocoupler was fried, or your microprocessor?

If that mention of an anemometer tweaked your curiosity, I have pages about weather monitoring for you. Connection to phototransistor. Let's consider the right hand half of the circuit above. It won't always be just as shown, with the green blob as the . But for simple work with, say, an Arduino, the circuit is nearly what you would do. For the Arduino, things would be really simple: you would merely connect the .

You need separate power on that side. Furthermore, don't think . Remember to include the usual current limiting resistor, and you can switch the optocoupler's LED on and off.. But if you are not sure how to do that, use an optocoupler.

The phototransistor in the optocoupler is only a tiny little thing.. But you can use it to operate the coil of a small relay, and the contacts of the relay can, if you buy the right relay, switch big loads. A word about household, or . AC, or 2. 30 volts AC. Stay away from it until you've had proper training. There are Ways To Go Wrong which you don't want to encounter, and may not see coming.

And errors can lead to death and destruction.. There are many, many suitable devices out there. Be careful with the pin- outs.. One example of this design is the nattily named . You can always add an external diode, meant for blocking a voltage, if you want to go with the . Be advised, though: If you are . Do please write in and tell me if bits were unclear, or you would like more help with optocouplers.

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Document Number: 83630 For technical questions, contact: optocoupleranswers@vishay.com www.vishay.com Rev. 1.6, 20-Oct-10 1 Optocoupler, Phototriac Output, High dV/dt. Optocoupler Tutorial. An Optocoupler, also known as an Opto-isolator or Photo-coupler, is an electronic components that interconnects two separate electrical circuits.