How to control 12V devices with Arduino. Using Relay vs Using N-Channel MOSFET transistor 

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@@marios_ideas i have an application where there is a relay and a fuse to a 12V load (only 1) I was considering using a relay module and ditching the fuse (is this safe or a relay module does not replace a single oldschool automotive relay + fuse)? I then found out about mosfet modules that are much more compact, now could these be a direct replacement to my old fuse relay combo?

same here, I finally "learned" how to use the Transistor and relay in a very clear way. now I can go on with my Project, thank you Mario!!! ♥♥♥♥♥

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yeah me too

Me too 😄 Dude youre are the only guy, that explains that with the mosfet so good!

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Thanks:) Watch my other videos . You may like it . The controlling circuits also is discussed in two other videos ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-5xxJx22cKtY.html(towards the end) and ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-9O0pb0I6bCU.html

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@@marios_ideas yes sir i support by watching all your videos

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@@marios_ideas Sad that I can only like it once! This was spot-on for me. Subscribed as well.

@@johnx9318 Have you checked this spin off video ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-9O0pb0I6bCU.html maybe you will like it to

@@marios_ideas I have not! thanks for this - I'll watch it first thing in the morning! top bloke!

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Never tried it but it should work. within next twoo weeks I would post another video call it appendix to this one that will show the ready to use posfert module.

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You would have to step down the 12v to the 5v or 3.3v arduino needs. Use a buck boost convertor.

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You always have to connect the grounds of the connected circuits. I will most likely do a separate video covering this topic as thie question is asked quite often

Yes you can. E.g. I found this project www.aeq-web.com/arduino-mosfet-pwm-dc-motor-speed-controller-irfz44n/?lang=en

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I know:) Silly mistake

Without resistor gate may react tooutside infuence (e.g. touching the wire). This make sure that when gate is not driven by the high signal from microcontroller it is pulled down to 0 through this resistor.

Sure. You have to read analog values from LDR and write a code to ma those readings to PWM values sent to Mosfet.

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I think you need logical level converter. Something like this www.aliexpress.us/item/3256803585917842.html. I would go on some electronic forums and ask for advice of which logic level converter would be the best for what you are trying to do

The mosfet in the circuits i used did not heat up. I come from programming background and learn electronics as i go. Maybe someone reading this commend can chip in some inforamatorom on that

You can power both arduino and devices (e.g. servos, led strips etc). You just have to make sure the powersource will provide enough current. So you may have 12v power source with 1A or 2 A or more. You cannot use power source >then 12v

at 5:05 you provided enough for me to find it (I must have missed that somehow). thanks

when I looked back through my electronics stash and specifically transistors in the MOSFET category, I do have a similar one, the IRFZ44N. From what I can tell the only diff between IRFZ44N and the IRLZ44N you suggested, is that the IRFZ44N is 49Amp and the IRLZ44N is 47Amp, otherwise they are both 55v. That being said, as I dug deeper, this is what I found on those two. "The IRLZ44N is a Logic level Mosfet with a very low gate threshold voltage of 5V, meaning the MOSFET can be fully turned on with just 5V on its gate pin which avoids the need for a driver circuit. The IRFZ44N on the other hand requires a gate driver circuit if the MOSFET has to be turned on completely using a microcontroller like Arduino. However it does turn on partially with direct 5V form a I/O pin, but the output drain current will be limited." Therefore, unless you have a gate driver circuit, do not use the IRFZ44N, the IRLZ44N you suggested is correct. I found them for about $1 each on Amazon (though you have to buy 10). Hopefully this helps someone

I have one more video ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-9O0pb0I6bCU.html where I used a MOSFET module and there IRF520 was used.

Then it is similar to diming the led. You use PEM pin of arduino

I would say you can use all MOSFET transistors as a switch. But I am not 100% sure so maybe sombody can chip in a word or two on the topic. e.g In video ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-9O0pb0I6bCU.html I used IRF520.

It is not a kit. those are the parts I bought separately on Aliexpress.

Arduino should handel 12v as long as you power it through VIN and GND pin. It has a built in step down.Do not connect to 5v pin as this would fry the board

You can. But you can also do a circuit with mosfets. Pleanty of discussion of people doing just that. e.g. forum.arduino.cc/t/circuit-for-controlling-multiple-solenoids/617457

The general rule is to connect load to drain. There is a number of articles e.g this one electronics.stackexchange.com/questions/97505/attaching-load-to-source-on-mosfet Seems like you would not be able to use nominal voltage of the power supply

Done:)

I am not that deep in the elctronis . My udderstanding is that N channel transistor require less current to switch and do not overheat

I come from programming background So i would advice you to post this question in Arduino forum i generał electronic section. You should have andwer within the hour.

This relay should be able to control any 12 circuit

@@marios_ideas how about using MOSFET? will it still suitable?

I am sure it can be used. But I would consult someone profficient with electronics to pick the right one so it does not overheat. Just write a question on any electronic forums describing your 12v circuit and ask which mosfet would they use if it requires any additional resistores etc. Most likely MOSFET I used would do the trick but I would double check it

Transistor is not a power supply. It is merely a switch that turns the circuit on or off and you can control this switch from Arduino

I think they were made for infrequent switch operations. If you want to do something with high frequency then go MOSFET

@@marios_ideas I was thinking of using it for a blinker (like indicator on a laydown bike) As it would make the machanical sound I thought it'd be kinda fitting. It won't be switching constantly, just a couple of times every so often when turning.

3 mosfets. Make sure that each RGB channel is connected to Arduino PWM pin

Thank you for the quick answer! I was wondering, in case the Red needs to operate with a lower tension, should I use a voltage regulator when I pull 12 Volts from the same source? For example: Blue 12, Green 12, Red 9.

@@denizsogutlu2070 Thats where PWM pins come in. You control the voltage analogWrite to the mosfets. When you write 255 then it will be 12 v and you can go down to 0 which represents 0v

Oh I see! So I can scale the Red Value in PWM with a 9/12 to obtain the same brightness. For example, would I then have a white RGB(equal) if I assigned these: (in the 0-255 PWM range) 90Red, 120Green, 120Blue

I have never tested it but this should work this way

I am sure you can. I di not play with motors yet. The one I have are 5v . I might do a video like this in the future

For controlling dc modules you have decicated modules like L298N

Those are not MOSFET transistors. They require more current and may get quite hot.

Look at the description on the relay. E.g look at this link allegro.pl/oferta/przekaznik-1-kanalowy-wysoki-niski-h-l-5v-arduino-13614098678 . The relay in that link is 5v one. Meaning that the signal to control the circuit will be 5 v and the circuits that you can control are up to 10A 220VC or 10A 30V DC. So if you want to control your solenoid from Arduino i has to be a 5v one

@@marios_ideas Alright, thank you👍🏻

Honestly i am not that strong in electronics. I hever had a problem with spikes. I have never fried any arduino boards. But next time I would use forum I would take your comments into account. Cliryfy on electronic forums. Thanks for your suggestion

A lot of the relays intended for Arduino can be set up with an optoisolator that is included in the module. You simply change a jumper from the configuration it comes with and power from a completely separate source (ie not the same power source the Arduino is using). The Arduino then basically turns on an led inside a cover that also contains a light sensor in order to trigger a circuit to trigger the relay.

@@BigGoad Yeah, but in this video, there is not any optoisolator in relay module. That's why I asked.

No promises... but you can send me the eBay link

Yes you can. I have not used IRF530N but if you cehck my video ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-9O0pb0I6bCU.html there I used a mosfet module with the built in IRF520N

I am not 100% what you want to achieve. You only can control device through the mosfet transistor when Arduino is powered on. Can you describe more.

@@marios_ideas I am trying to power the LED lights with PC PSU (connected to molex), then the mosfet is connected to Arduino for control. The Arduino is powered via USB on motherboard slot so that I can send data from PC to Arduino for controlling LED lights.

I come from programming background So i would advice you to post this question in Arduino forum i generał electronic section. You should have andwer within the hour. If you get the feedback Please share it with me

Mind you I am IT person playing with electronics. If you want to seamlessly switch to UPS in case of power supply outage , this requires some more sofisticated stuff not just a standalone mosfett. What I would do if I were you I would go to official Arduino Forum and open the post in General electronics section. There you have experienced guys which are willing to look at your requirement and suggest how to tackle it. forum.arduino.cc/

So I changed to the MOSFET indicated in the video but had to change to a 100k resistor and now its working with the proper brightness as expected. 😕 but its working so yay

BJTs do not seem to be good for switching . I found this thread that discusses this and and conckusion is also to use MOSFet

Not very likely as with relay the 5v and 12v circuits are isolated. The 12 v circuit is closed and opened using magnetic coil. Maybe your relay was somehow damaged. Was the power source for Arduino 5V?

@@marios_ideas I used a 9V battery to power the arduino and after inspection it turns out the arduino is still working properly which is good. I had the arduino programmed to control different relays using a button, which would activate depending on how many times the button was pressed, with the default state being all relay channels off. Upon further inspection of my circuit, I found that my relay DC in and DC out ports were not connected to the arduino at all. Could something like this result in the outcome I had where the moment the power source is connected the 12V circuit would complete?

if you are talking e.g 12v LED white led strip with just plus and minus then by all means yes

@@marios_ideasis there a specific type of mosfet I need or range?

I am not that proficient with reading datasheets.I would ask this question at electronic forum.

Please share schematic. Can be Hand drawn. Include all components, their part numbers and/or values and all power supplies. mdraber@email.com. I do not often use this email so please let me know when it is sent

I don't see your exact circuit so difficult. I would need to see if I can recreate the problem. I to anderstand I I took 12 v power supply and power arduino with it through VIN pin and GND pin and then also power a separate circuit in which e.g. magnetic lock is connected and the circuit has a transistor in it with gate pin controlled by one of arduino pins that would recreate the setup you have right?

Well for motors you have motor controllers. Just to power it. Shure this would work