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How to make a LOW Triggered 8 Channel relay driver board | Optically isolated board 

EE Wave
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In this video, How to make an 8 Channel relay driver board, I've explained how to make an optically isolated relay driver circuit by using an optocoupler, here I've used PC 817. This will isolate between input and output section for safety purpose. This type of board is widely used with microcontroller circuit or digital ic circuit to drive high voltage devices. Input of this board is active LOW. Active LOW input is always better than having an active HIGH input.
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21 авг 2024

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Комментарии : 71   
@sto2779
@sto2779 3 года назад
Thanks this circuit is simple and solid!!! Works!! I used an infrared led and a phototransistor as the optocoupler and a 2N2222 transistor, I was able to switch the isolated relay using an Arduino.
@EEWave
@EEWave 3 года назад
Excellent!
@tonyseben
@tonyseben 3 года назад
Your videos are awesome. Really helps newbies. You explain the concepts on paper. Then you do two iterations, one on the breadboard and then on the perfboard with all the pin details. That really helps. And no irritating background music. Subscribed!
@EEWave
@EEWave 3 года назад
Thank you, welcome to my Channel..!
@brodiegus2473
@brodiegus2473 3 года назад
i realize I'm pretty randomly asking but do anyone know a good place to watch newly released tv shows online ?
@cristianjadiel3808
@cristianjadiel3808 3 года назад
@Brodie Gus meh try flixportal. just search on google for it:D -cristian
@brodiegus2473
@brodiegus2473 3 года назад
@Cristian Jadiel thank you, signed up and it seems like they got a lot of movies there :) I really appreciate it !!
@cristianjadiel3808
@cristianjadiel3808 3 года назад
@Brodie Gus happy to help =)
@JohanDegraeveAanscharius
@JohanDegraeveAanscharius 2 года назад
I have to say, I saw many video's explaining this, this is one of the best (no resistor between signal and led?)
@MikeHarris1984
@MikeHarris1984 2 года назад
Thank you for this!!! I've been looking for a stupid simple solution to drive my 5v relay with a 3v output from my ESP32 and didn't want to create an entire step up voltage circuit. So I paired this with a logic level converter and am not able to drive all my relays reliably!!
@SteveRaynerMakes
@SteveRaynerMakes 2 года назад
Really good video, I should add.
@xenonelectronics
@xenonelectronics 2 года назад
Awesome video!
@greggil3454
@greggil3454 3 года назад
Amazing tutorial and explanation ! Thank U!
@EEWave
@EEWave 3 года назад
Glad you enjoyed it!
@ronaldronald8819
@ronaldronald8819 3 года назад
Thanks for your explanation. gone give it a try
@omkarkhade4602
@omkarkhade4602 3 года назад
Great tutorial 👍 Thanks a lot.
@EEWave
@EEWave 3 года назад
Glad you liked it!
@animadoarts5123
@animadoarts5123 4 года назад
Nice precise
@SteveRaynerMakes
@SteveRaynerMakes 2 года назад
The question I have is how do you obtain the second power supply? ie do you use a transformer and a rectifier, or a dc-dc converter? In your example, you are isolating a 5v power supply from a 5v power supply. There doesn't seem much point, but I suspect there are safety benefits, maybe protecting the microcontroller from potential high reverse voltage from the relay coils. The main isolation from the mains power supply is provided by the relay itself, but you don't really talk about that.
@shahsamir7028
@shahsamir7028 5 лет назад
Very nice bro.your way of teaching is excellent. Even which pins or wire contact to Arduino and Which pins or wire connect in external power supply. diagram and coding also was excellent. Thanks👍
@EEWave
@EEWave 5 лет назад
You're welcome bro...
@orveahava
@orveahava 4 года назад
Thank you❤
@marcetigreshark
@marcetigreshark 4 года назад
Great work congratulation !!!!!!!
@EEWave
@EEWave 3 года назад
Thanks a lot!
@VINInvents
@VINInvents 8 месяцев назад
can I still do the same thing without the octocoupler?
@redouanedigueche
@redouanedigueche 3 года назад
how can I put 1000 thumbs UP? impressive tutorial.
@EEWave
@EEWave 3 года назад
Thank you so much dear...
@visionacademyinspiringinno7083
@visionacademyinspiringinno7083 2 года назад
Bhai 16 chanel m ic based भी बता dijya
@kamarulazizzainbinzainun3466
@kamarulazizzainbinzainun3466 3 года назад
thank you for infor
@EEWave
@EEWave 3 года назад
Always welcome
@christianwolff3276
@christianwolff3276 2 года назад
Could you explain why you choose 10k for the base resistor?
@thuanngo4049
@thuanngo4049 3 года назад
I have a question. If I use the 24v instead of 12v/5v. Is is okay or it maybe cause damage to opto. Thank you.
@greggil3454
@greggil3454 3 года назад
Could it be possible to use MOSFET transistor or BJT transistor instead of Optocoupler ?
@EEWave
@EEWave 3 года назад
We can do it without optocoupler. But, to electrically isolate the low voltage circuit from the high voltage circuit, we have to use optocoupler and a different power supply to operate the relays.
@greggil3454
@greggil3454 3 года назад
@@EEWave Yes U are correct, but I think it is also possible to use PNP and NPM transistor working together witch simply PNP is on high voltage site and NPN on microcontroller site ,but they are not completely isolated though. Your solution is definitely one to use in production circuit . Well done !
@mohamedkeita1509
@mohamedkeita1509 4 года назад
Super cool maître mais parfois veuillez faire en français,je suis francophone . veuillez agréer mes sentiments les plus distinguées...
@saikatd9037
@saikatd9037 Год назад
how to use different power supply for real life project...their ground must be common
@mate2173
@mate2173 3 года назад
Hi, good video. Very informative, but I have a question regarding bc337 transistor component in the circuit. I don't understand, why we need it in the secondary circuit, and what will happen if I remove it, will the circuit still work? I am assuming it is used to isolate 5v and emitter pin of optocoupler.
@SteveRaynerMakes
@SteveRaynerMakes 2 года назад
My understanding is that the optocoupler cannot handle the amount of current required to drive the relay coil. Therefore the transistor is used as a current amplifier.
@lambert8443
@lambert8443 2 года назад
I have an essential question, once we use ULN2803, can we do without the free-running diode for the relay? thank.
@EEWave
@EEWave 2 года назад
This IC has common freewheeling diode so we don't need to use.
@safaenet
@safaenet 3 года назад
what if we wanted to run 3v relay ? what are the values going to be ?
@ronakrathod1093
@ronakrathod1093 4 года назад
Can I use MOC3021/41 instead of pc817 And I want to use +ve volt for ( optocoupler) signal so what can I do for it.
@fatherbillagaming6433
@fatherbillagaming6433 2 года назад
please provide components list
@technicalera1
@technicalera1 4 года назад
Can I use bc 547 transistor also
@EEWave
@EEWave 4 года назад
Yes, you can.
@saikatmondal809
@saikatmondal809 4 года назад
If the input signal voltage is 3.3 volt. Will ot work.
@faizeri4950
@faizeri4950 3 года назад
Hi ... is this BC337 -25 or BC337 -40?
@artechnical8930
@artechnical8930 Год назад
Y
@mr.anirban6631
@mr.anirban6631 3 года назад
3:00 why can't the ground be same?
@EEWave
@EEWave 3 года назад
Isolation means there should not be any kind of electrical connection between input side and output side. If we use same ground or single power supply to powering the microcontroller and to powering the relay, then there will not be any meaning of using the optocoupler.
@mr.anirban6631
@mr.anirban6631 3 года назад
@@EEWave I understood you want to completely isolate the relay module, but if I make the ground common will it cause any damage to the circuit?
@EEWave
@EEWave 3 года назад
No damage. You can use this as a simple relay board. If you want to make HIGH triggered relay board, then please watch this video: ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-R7nD7RA26xE.html
@shaktiswarupabiswal3377
@shaktiswarupabiswal3377 4 года назад
bhai diagram ka pdf link me daldijia
@rakeshchitara2464
@rakeshchitara2464 4 года назад
West my money
@EEWave
@EEWave 3 года назад
This circuit is 100% accurate circuit, it is LOW triggered relay board. I think you are facing some problem with LOW triggered board. Now I've uploaded the HIGH triggered relay board video, link in the description below. I hope that video will help you.
@rakeshchitara2464
@rakeshchitara2464 4 года назад
Ye circuit kaam nahi krta
@R_Solanki97
@R_Solanki97 4 года назад
Kya dikkat aati hai bhai iseme
@EEWave
@EEWave 3 года назад
This is LOW triggered relay board. I uploaded the HIGH triggered relay board video, link in the description below. I hope that video will help you.
@devsong8587
@devsong8587 3 года назад
Hindi me hi bol leta bhai English samjh nahi aata
@EEWave
@EEWave 3 года назад
Bhai. Maine ek hindi channel shuru kiya hai. Woha pe dhire dhire video dal raha hu, please wo channel please visit karke feedback comment sections mai dena. Mai try karunga usko better banane ka. "EE Wave hindi" hai channel ka naam.
@EEWave
@EEWave 3 года назад
Bhai ye video nahi hai. Abhi tak hindi mai isko banaya nahi. Agar aap logo ka ashirbad ho to jarur video dalta rahunga ek ke bad ek.
@devsong8587
@devsong8587 3 года назад
Ok bhai. Plz jaldi banao ye vedio hindi me Mere ko bahut jarurat hai plz Mere pas remot contl switch ka pura metariyal hai
@devsong8587
@devsong8587 3 года назад
Mob par vedio cal par help kar sakte ho to mob number de do plz
@devsong8587
@devsong8587 3 года назад
Plz help me
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