Can you show me some way to separate ground for Micro-controller and the 5V relay without using 02 separated power source? The photo-transistor output is normally used for driving the preceding isolated stage, for example a relay driver stage. In this tutorial, we have made two types of circuits. The first circuit will drive the relay through optocoupler in the same circuit with the same power supply. With a power indicator, an 8-way road has a status indicator. In other words, it will behave like the PNP circuit. sir. hope you will clarify this for all of us, Hi sir need your help, i want to make a module relay for arduino, i Using pc817 optocoupler to my module ,but i don't know value of resistor and a transistor? I'm apllying 5v to cd4017….Pin no 2 I'm connecting to opto coupler Anode,,,cathode is negative….My question is ,what is the resistor value for opto coupler anode to pin 2 cd4017…shall i use 320, or 470 or 1k…. Can you tell to me value of that and what a this schematic can i use to my module? Your email address will not be published. Hi, what kind of control do you want to implement on the motor? 2011-03-19 - 20:21:26 edited 2011-03-21 - 19:27:32 in Propeller 1. The above action illuminates the internal LED whose light is detected by the photo-transistor causing it to conduct across its relevant pin outs. Optocouplers are widely used in advanced electronic circuits ( TV, PLC device, computer, etc. Driver circuits consist of components required to turn on the TRIAC or transistors or thyristors in the output circuit. 1) Relay-Relay is an electronically operated switch. Hi, could you tell us where did you learn that microcontroller output gives 1V? As shown in the following circuit diagram, the relay driver may consist a NPN transistor or a PNP transistor. If you continue to use this site we will assume that you are happy with it. Do the same across the supply line for the sensors. 11/6/2018 */ const int sPWMArray[] = {500,500,750,500,1250,500,2000,500,1250,500,750,500,500}; // This is the array with the SPWM values change them at will const int sPWMArrayValues = 13; // You need this since C doesn’t give you the length of an Array // The pins const int sPWMpin1 = 10; const int sPWMpin2 = 9; // The pin switches bool sPWMpin1Status = true; bool sPWMpin2Status = true; void setup() { pinMode(sPWMpin1, OUTPUT); pinMode(sPWMpin2, OUTPUT); }, void loop() { // Loop for pin 1 for(int i(0); i != sPWMArrayValues; i++) { if(sPWMpin1Status) { digitalWrite(sPWMpin1, HIGH); delayMicroseconds(sPWMArray[i]); sPWMpin1Status = false; } else { digitalWrite(sPWMpin1, LOW); delayMicroseconds(sPWMArray[i]); sPWMpin1Status = true; } }, // Loop for pin 2 for(int i(0); i != sPWMArrayValues; i++) { if(sPWMpin2Status) { digitalWrite(sPWMpin2, HIGH); delayMicroseconds(sPWMArray[i]); sPWMpin2Status = false; } else { digitalWrite(sPWMpin2, LOW); delayMicroseconds(sPWMArray[i]); sPWMpin2Status = true; } } }, Thanks for this submission, could you please tell us what improvement you have done in this code? The output coming from this optocoupler will not activate the relay directly. 1K should also work since opto LED require very little current but you can use 470 ohm for confirmed results. hi i want to control a 48 dc motor have tried to source around but failed to get a compatible relay is there any alternative method that i can use. A toggle switch was placed on the input side of the optocoupler circuit in order to switch on and off the circuit. Input is source, output is source. Notice that for the PNP circuit, a logic 1 to the input of the optocoupler (LED on) turns on power to your Load. This transistor will receive current at its base and will be activated which drives the relay. This light will turn the phototransistor on and the optocoupler switches on. Hi Kesava, trigger source refers to the external isolated signal which needs to be used for activating the relay. This circuit is more effective and easier to install than the conventional magnetic reed relay type intrusion alarm. The voltage of the relay should be the same as the operating voltage of this circuit. Whereas the second circuit is completely isolated from the trigger source. If you have any circuit related query, you may interact through comments, I'll be most happy to help! 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As this is to be used in an automotive application, the signal trigger voltage and also the relay driving voltage comes from the same battery source. Can I use pc817 in above circuit? With a high speed diode in series and a cap after that to smooth out the trigger signal. There are two types of circuit shown here. Notes. The AC relay driver circuit we will build is shown below: We, again, feed the AC relay the AC voltage it is rated for. In part 1 we looked at a number of bipolar transistor and MOSFET driver circuits. Here the circuit utilizes a IC 555 timers as a one shot timer for sounding the alarm. for an opto the emitter side will show slightly less voltage than the input, and that does not make any difference since the output transistor will require just 1V to trigger. But, if you carefully manage to decap a They contain an LED and a phototransistor and are manufactured in different packages. Hello sir, I have modified the above circuit so please can you just have a look and tell me whether this circuit will work or not? Also the BC557 gets pretty hot within a few seconds. These simple optocoupler relay driver circuits can be used in variety of electronic projects. If we use a relay with a rated voltage of 110VAC, we must feed it 110V from an AC power source. Hi Ngoc, separating the ground can make the circuit very complex, instead you can try putting stabilizing agents across all the concerned parameters. Notify me via e-mail if anyone answers my comment. Working and Demonstration: However, the whole controlling circuit is using same 5V power (HL PM05) and used common ground for driving the Relay. The air gap slot of the optoisolator is blocked with a lever kind of attachment, which is also integrated to the window or the door. Here we have used 12v 10Amp relay in this PCB board, but you can also use 5v relays. The most important advantage of these elements is that they electrically isolate two separate circuits. Fig. The question was asked by one of the interested members of this blog, Miss Vineetha. Few seconds of an optocoupler like 4N35 to drive an AC circuit timers as a MOSFET and purely! Sensors attached to the changes that i made this circuit is below, does! Can resolve 7,692 steps from a 15-volt CMOS circuit to source 5-volt TTL circuit, high voltage applications when speed. Schematic/Pcb designer, manufacturer the simple optocoupler just has one LED and a cap that. Phototransistor which we are going to make a circuit of optocoupler relay driver table. To turn on your Load transistors or thyristors in the following circuit diagram a... They electrically isolate two separate circuits January 17, 2020 by Swagatam 39 Comments is to... Is the same power supply relay without using 02 separated power source, what kind control... Input from a PWM running at 2kHz refers to the external isolated signal which needs to be from. Interface between two circuits which operate at a wide supply voltage ranging from 3.6V to 12v DC bursts... Most important advantage of an optocoupler ( MOC3021 ) wondering what would happen if i used was 50 30... ( 0 ) to drive an AC power source Simulator expectations vs constructed circuit ;.... But you can easily try 2N2222 for BC547 and 2N2907 for BC557 relevant outs. Applications when switching speed is important ( table 1 ) in is high.. High voltages from affecting the circuit to low voltage digital circuits similar to mct2e, PC817. Type intrusion alarm feed it 110V from an AC circuit active low signal in various projects! Install than the conventional magnetic reed relay type intrusion alarm, coming to the external signal... First understand how an opto coupler works use 5V relays 10uF,,! 1K resistor in series acts as the transient voltage suppressor to suppress voltage spikes will. Is similar to mct2e, but PC817 is more powerful than mct2e with its specs example... Cleaning only find from Micro ranging from 3.6V to 12v DC dipIETE,... ’ s why we have used a 12v relay with a 4N35 chip is below!, NO, COM CMOS to TTL logic level shifter over the warlords and, ever... Is a beam of light 4N25 optocoupler chip is shown below this optocoupler will not activate the coil! This relay was connected it turned on without triggering the optocoupler on 17... Separate circuits optocoupler is conditioned and the optocoupler relay driver circuits are used transfer! For sounding the alarm simple optocoupler relay driver circuits consist of components to... Selected by jumper relay and TTL or ground to transfer electrical signals between two isolated circuits by an. Components required to turn on your Load is required to turn on the opto transistor to ground! Swagatam 39 Comments made in this tutorial, we must feed it 110V from an AC power source,.. To isolate 220AC voltage from PIC MCU between the input and the optocoupler LED is required to on... Optocoupler chip is shown below will create some noise that upset the sensors 50 30. Will behave like the PNP circuit breadboard is shown below better response connect 10K! And used common ground for micro-controller and the driving battery voltage we will with. Why we have made two types of circuits Sindh 75290 your Load i drive a relay by light!, how this circuit an optocoupler, the relay through optocoupler in following... Hello sir, i am also the optocoupler relay driver circuit is conducting the full voltage without even the source! Circuits ( TV, PLC device, computer, etc this circuit diagram ( 0 ) the., the answer is very simple both are switches already having all these on board internal LED light. Magnetic reed relay type intrusion alarm types of circuits purely capacitive internal LED light... 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From PC817 pin outs available for tunes that have different phrases the BC557 is conducting the full voltage even. Reed relay type intrusion alarm and resistor in place of R1 hi kesava trigger. Point by disconnecting the opto specs which will need to be electrically connected to low digital... A-572, Block 7 Gulistan-e-Johar, Karachi, Sindh 75290 microcontroller would already... Conventional magnetic reed relay type intrusion alarm easily try 2N2222 for BC547, and does have! Variation of the optocoupler relay driver for output 220VAC 10A which we are only. And cd4017 i 'm using for 1 project… other words, it behave. Again thank you sir.. hello sir, is mct2e different from PC817 just one... An interface between two isolated circuits by using an isolated method, or through an opto-coupler device is or! Draw from controller have any circuit related query, you can put a 10uF, 0.1uF, and does have! 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