Interfacing of optocoupler with arduino

congratulate, very good idea suggest..

Interfacing of optocoupler with arduino

This simple device isolates the sensitive electronics from robust electronics like motors, yet keeping the load in control over the source. Say we want to control the speed of an AC motor like fan, with control logic from a controller. We can fed the signal from controller to system of control which drives the motor.

But during the process we also take the noise from the motor speed control system. Because its AC circuit and that too motors we will have to do a lot of noise filtration. By this we avoid noise transmission between systems yet we could keep the load in total control. We will send signal to a light emitting device at the source end and there will be a light trigger switch at the load end. We will discuss this more in description. So control signal from controller gets converted to light for triggering the light sensitive load driver.

With diode at source end and transistor at load end, the above circuit makes complete sense to the name. Recommended Posts. Didn't Make it to embedded world ? No problem! Fundamentals of IoT Security.

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From Nano-power to Light Speed. Raspberry Pi Connect. Get Our Weekly Newsletter! Helena St. Comments Log in or register to post Comment.Pages: [1]. Arduino with optocoupler.

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I am trying to protect my controller by adding optocoupler in digital pins. By interfacing optocoupler with my Arduino, the controller get heated.

I have attached the image of optocoupler ckt. I have used 3 optocoupler for 3 digital pins, can anyone guide me. Advance thanks. Re: Arduino with optocoupler. Hi, you're not specifying, if that optocoupler is used at an input pin of the Arduino, or an output pin.

Arduino uno Electronics tutorial phototransistor Optocoupler or Opto-isolator working & use "motor"

How have you configured that pin in your software? Is it configured as input, or maybe accidentally as output, driving high current through the transistor or the pull up?

Which Arduino board and which pins? Maybe you're using a pin which is already used for another function? CU, Christian. I am using the optocoupler for output pin of Arduino. So I have assigned output in the software for that pin Christian. Hi, assuming a 1. Times 3 that can cause some heating.

What kind of optocoupler do you use? Maybe check the datasheet and find out, if a bigger series resistor could be used. And maybe show us a schematic which also shows what is connected on both sides of the optocoupler. Quote from: Nihaludeen on Feb 12,pm. TomGeorge Design and Repair of industrial control systems. Hi, OPs Circuit. Everything runs on smoke, let the smoke out, it stops running This is a suggested circuit from datasheet. Quote from: TomGeorge on Feb 13,am. LesserMole Jr. Replies 6 and 7 make little sense to me, in the light of 2 but yes it would be nice just for the sake of confirmation to actually see the Arduino in the schematic not just a standalone opto.PC is an optoisolator consists of an infrared diode and phototransistor.

In electric circuits, we use mostly filters to remove noise. The circuit based on the capacitor and resistor always removes the noise from the incoming signal but the value capacitor and resistor always depend on the incoming signal. This circuit is only applicable where the incoming signal has some information or data but when we just need to forward the signal from one part of the circuit to the other part but signal contains noise, then we could use the combination of IR sender and receive.

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In PC photoisolator IC circuitthe IR receives the noisy signal as a power from the one circuit and passes it to the other part through the IR signal. The other part receives the signal and then performs according to the circuit design.

interfacing of optocoupler with arduino

PC consists of an LED emitting diode and phototransistor. They are coupled together optically. The Electrical signal transfers between an input and an output side optically without any physical connection between both sides.

The IR circuit can be designed by hand but we have a fully predesigned and small size integrated circuit IC knows as PC Optocoupler.

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The PC Optocoupler is small in size and comes in multiple packages. It can be directly connected to any low voltage dc device or microcontroller.

The input voltages will have the same effect from every side on the optocoupler, it will just transfer the signal to the receiver and then the receiver will give the logic signal as output. The optocoupler has many uses due to his small and compact size as a control operation. The diagram represents the pin configuration diagram and explains the functionality of each pin.

In this pinout diagram of PCpin1 and pin2 are parts of the input side and pin3 — pin4 are output pins. The working of PC is very simple but to use it with different devices comes with specifications. The optocoupler at input requires current limiting one resistance but at the output, we will need to connect the logic output pin with the power pin. Whenever the IR signal will be generated at then the logic state will be changed from 1 to 0, due to change in the flow of current.

Interfacing Optocoupler with Arduino

The circuit design is given below. The circuit is totally simple but the resistance will give it protection at the input in HIGH voltages. The Optocoupler is just a small-sized circuit of infrared receiver and sender but in case of making it with externally by using IR sender and receiver cause many problems. The optocoupler has many uses but due to increasing in IOT field from the optocoupler is now increasingly using in daily life to control the appliances.

In IoT especially home automation or heavy load control, we need to control the AC load by the effect of change in frequency. To do so we will need a zero cross. The zero-cross is the method in which we receive the change in the frequency signal of the AC voltages. The change in voltage gives the ability to control the AC. The basic features of optocoupler here is to give the change in frequency pulse. The DC voltages coming out from the resistance is lower in voltages but it has a noise that is not effective to use as the signal.

To convert it to the proper signal we use the optocoupler.

Isolating Circuits From Your Arduino With Optocouplers

The optocoupler generates the same type of single pulse no matter how much the signal has noise.PC is an optoisolator consists of an infrared diode and phototransistor. In electric circuits, we use mostly filters to remove noise. The circuit based on the capacitor and resistor always removes the noise from the incoming signal but the value capacitor and resistor always depend on the incoming signal.

This circuit is only applicable where the incoming signal has some information or data but when we just need to forward the signal from one part of the circuit to the other part but signal contains noise, then we could use the combination of IR sender and receive. In PC photoisolator IC circuitthe IR receives the noisy signal as a power from the one circuit and passes it to the other part through the IR signal.

The other part receives the signal and then performs according to the circuit design. PC consists of an LED emitting diode and phototransistor.

interfacing of optocoupler with arduino

They are coupled together optically. The Electrical signal transfers between an input and an output side optically without any physical connection between both sides.

The IR circuit can be designed by hand but we have a fully predesigned and small size integrated circuit IC knows as PC Optocoupler. The PC Optocoupler is small in size and comes in multiple packages. It can be directly connected to any low voltage dc device or microcontroller. The input voltages will have the same effect from every side on the optocoupler, it will just transfer the signal to the receiver and then the receiver will give the logic signal as output.

The optocoupler has many uses due to his small and compact size as a control operation. The diagram represents the pin configuration diagram and explains the functionality of each pin. In this pinout diagram of PCpin1 and pin2 are parts of the input side and pin3 — pin4 are output pins. The working of PC is very simple but to use it with different devices comes with specifications. The optocoupler at input requires current limiting one resistance but at the output, we will need to connect the logic output pin with the power pin.

Whenever the IR signal will be generated at then the logic state will be changed from 1 to 0, due to change in the flow of current. The circuit design is given below.A Optocoupler also called a photocoupler, optical isolator or opto-isolator is a small chip that transfers signals between two isolated circuits using light.

interfacing of optocoupler with arduino

A basic optocoupler uses a led and a phototransistor, the brighter the led the more current is allowed to pass through the phototransistor. In this instructable I will show you how to isolate and control the speed of a 12v PC fan with your ARDUINO board, This circuit could be used to control many things with minor modifications to the circuit.

So lets get started! Did you use this instructable in your classroom? Add a Teacher Note to share how you incorporated it into your lesson. The transistor I recommend for this instructable is a 2N but any transistor that will handle the voltage and amps of your fan or motor will work fine, If you are going to be using a motor or devise that has high current pull I suggest using a Darlington transistor like the TIP If you are using a big fan or motor you might want to place a diode between the positive and negative of your devise so if the power gets cut the power generated by the fan or motor does not exceed the reverse voltage of your transistor if the power is cut and your motor is still spinning it will act like a generator until it stops spinning.

Just use a rectifier diode with the positive end connected to the negative of the fan or motor and the negative side of the diode to the positive side of your devise.

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Now that you have the circuit built lets upload the code and try it out, just copy the code below and paste it into your Arduino ide. If everything is working properly your fan or motor should be spinning, just remember if your starting from zero fan off you will probably need to enter a number of 20 or higher to get the devise spinning.

I hope this instructable helped you out and if you have any questions or need some help just leave a comment and ill get back to you ASAP!!! Hello everyone, it's great as a solution, and in line with the editing I want to do.

But the thing is, that also says that the TLP could have an absolute max rating of 60mA, which could damage the uC.

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How often could this abs. Thanks a lot for your instructable, very straight forward and hands on. Take care. Reply 3 years ago. I know this is an old post. The current ratings is for the optocoupler, meaning it can lead a max ampere of 60mA through the led inside. This is why you put a current limiting resistance in series with the led, to limit it's current to a nice level for the optocoupler and the arduino.

interfacing of optocoupler with arduino

This will also increase the lifetime of the optocoupler. So, you shouldn't run neither the opocoupler or an arduino output at 60mA at all, if you want them to last for a while. ALL i will be doing on the output side is flashing a pre-hardwired number on the display.

Thank you again!!Optocoupler is also called as opto-isolator. Optocoupler or optical isolator are designed to electrically isolate one circuit from another while allowing one circuit to control the other. The usual purpose of isolation is to provide protection from high-voltage transient, surge voltages and low-level electrical noise that could possibly result in an erroneous output or damage to the device.

Such isolators allow interfacing of circuits with different voltage levels and different grounds etc. An optocoupler or optical isolator consist of a light source such as LED and a photodetector such as a photo transistor as shown in figure 1 a and is available in a standard IC package.

When LED is forward-biased, the light produced by it is transferred to the phototransistor when is turned ON thereby producing current through the external load. Figure 1 b shows a Darlington transistor coupler which is used when increased output current capability is needed beyond that provided by the phototransistor output. The LASCR output coupler for figure 1 c can be used in applications where a low-level input voltage is required to latch a high voltage relay for activating some kind of electro-mechanical device.

The circuit of Arduino and optocoupler interfacing is shown in figure 2. MCT2E is 6 pin optocoupler but here we are using only 4 pins as shown in figure. Pin 1 of MCT2E i. Reason of using PWM pin is to vary voltage but you can use digital pin instead according to your requirement. One current limiting resistor is connected between arduino pin 9 and optocoupler pin 1 in order to protect LED from burnout.

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You can also use higher value of resistor but not lower. Current limiter at other side depends upon your circuit and operating voltage. One pull-down resistor is connected between gate and ground in order to avoid false triggering. Like this: Like Loading Sample and Hold Amplifier IC.By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service.

Electrical Engineering Stack Exchange is a question and answer site for electronics and electrical engineering professionals, students, and enthusiasts. It only takes a minute to sign up. I recently bought this optoisolator datasheet PDF.

I am wondering how I can connect it to my Arduino. I have some ideas, but I am afraid to test them because I might damage the board. What I am trying to do is to connect and disconnect a circuit.

What should I connect to the pins on the breakout board? The pins are labeled:. If your isolated supply is e.

Optocouplers – Working, Characteristics, Interfacing, Application Circuits

Sign up to join this community. The best answers are voted up and rise to the top. Home Questions Tags Users Unanswered. Interfacing an optoisolator with arduino Ask Question. Asked 8 years, 2 months ago. Active 8 years, 2 months ago. Viewed 2k times. Kevin Vermeer BTW, it contained similar grammatical errors, I corrected them in both places.

Please make an effort to improve the quality of your posts before adding more! Active Oldest Votes. Oli Glaser Oli Glaser Wouter van Ooijen Wouter van Ooijen Of course there is no reason why you couldn't use it the other way round though - it might be useful if opcode clarifies which way the signal is being sent.


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