How To Control A Solenoid With A Raspberry Pi Using a Relay

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Demonstrated here is an easy way to control a 12 Volt Solenoid and a 5V Relay using a GPIO Pin on a Raspberry Pi.
Article with Code - core-electronics.com.au/tutor...
Related Information
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Solenoids are immensely useful way to turn electrical energy into a linear motion. Solenoids come in a variety of different specs with 5 Volt and 12 Volt being very common for makers. So today we will activate the stronger 12 Volt solenoid using the Raspberry Pi GPIO (General Purpose Input and Output) Pin with a Relay module in between the two. A relay is an electrically operated switch and we need one for this because the 12 Volts that the Solenoid requires to operate would fry the Raspberry Pi if directly connected to that voltage as the maximum voltage it can take is 5 Volts. It can also deal with voltage spikes. Here you can find schematics, how to wire it up correctly and how to write code to activate and deactivate any 12V solenoid. I even show how you can control it directly from your mobile phone. Shown here is a latch solenoid but there are more traditional plunger type solenoid and even liquid solenoids.
If you have any questions about this content or want to share a project you're working on head over to our maker forum, we are full time makers and here to help - coreelec.io/forum
Core Electronics is located in the heart of Newcastle, Australia. We're powered by makers, for makers. Drop by if you are looking for:
Latch Solenoid 12V (used here): core-electronics.com.au/catal...
5V Single Channel Relay Module 10A (used here): core-electronics.com.au/catal...
Raspberry Pi HAT 3X Relay: core-electronics.com.au/catal...
Plastic Water Solenoid 12V: core-electronics.com.au/catal...
Brass Liquid Solenoid 12V: core-electronics.com.au/catal...
Raspberry Pi 4 Model B 2GB: core-electronics.com.au/catal...
12V DC 2A Fixed 2.1mm Plugpack: core-electronics.com.au/catal...
0:00 Intro and Schematic
0:10 Overview of Video
0:29 What You Will Need
1:47 Schematic and Build
3:13 Coding the Raspberry Pi
3:50 Its Working!
4:00 Quickly Explaining the Code
5:20 Control It With Your Phone
5:33 Other Relay Types and Methods to Control
6:00 Outro

Пікірлер: 144

@Beavis-et8ox Жыл бұрын

The way you explain things matches perfectly how my old brain learns. Thank you for this, great job.

@SirTrollingham 2 жыл бұрын

I got a raspberry pi a week ago and just found your channel. You have the easiest to understand explanations of both the hardware and software side of things. Great video, and I'm looking forward to seeing more of your content.

@Core-Electronics 2 жыл бұрын

Glad to help ! 😊

@DanRamosDR 2 жыл бұрын

I actually needed this information to do the same thing with a Raspberry Pi Pico! Same principle, really! THANK YOU!!!

@Core-Electronics 2 жыл бұрын

Yay, hope your project is going well 🙂

@DanRamosDR 2 жыл бұрын

@@Core-Electronics I shall endeavor to do so, good sir!

@fokopokco Жыл бұрын

Thank you overwhelmingly. Thanks to you, you saved a Korean college student.

@Core-Electronics Жыл бұрын

문제 없어요 😊!

@ChandlerHartman 3 ай бұрын

you do a great job on your videos!

@baharbahar9960 Жыл бұрын

thank you so match ....great video

@d0nt-rump202 Жыл бұрын

Good info and video

@MegaBlox_YT 2 ай бұрын

This would be great to have in your room & unlock this with a fingerprint scanner or an LCD display.

@Core-Electronics 2 ай бұрын

We've got a separate video about a fingerprint scanner for Raspberry Pi, you could easily combine those two guides together if you were interested. Check it out here: kzfaq.info/get/bejne/Y6-FlMiQkrLVgmg.html

@MegaBlox_YT 2 ай бұрын

@@Core-Electronics Thanks! Your videos are amazing

@fridder. 10 ай бұрын

Thank you

@stowjer 2 жыл бұрын

Super vid! Cheers

@Core-Electronics 2 жыл бұрын

Thanks 😃

@javanisme 3 жыл бұрын

it's works.. thank you bro

@Core-Electronics 3 жыл бұрын

You're welcome!

@barrythelad7793 2 жыл бұрын

10/10 tutorial

@Core-Electronics 2 жыл бұрын

😊😊

@TangodownNZ Жыл бұрын

Thanks for this. Some people say to use a diode to stop current flowing back?

@Jdog-np6oi 2 жыл бұрын

Thank you so much for the quick responce time! I just had one more question, could we use the 5v pins insted of the 3v pin. Because I am using three relays there are only two 3v headers and 2 5v. Or would I be able to attach two relays to one 3v header. Thank you so much for the help, keep up the helpful and amazing content!

@Core-Electronics 2 жыл бұрын

Excellent question. So you won't be able to use the 5v pin. I wrote a comment below which explained the exact details of why. However there should be no issue attaching two relays to one 3.3v Pin if the relays are connected in parallel.

@jimsquared153 Жыл бұрын

Awesome video! Crazy how I thought to myself I'd never find a video of this, and here you were. Any recommendations on how you could link multiple solenoids to the raspberry pi? Say I wanted to have 5 latches (only opening one at any given time)

@Mike-qd6lb 10 ай бұрын

Instead of an sd card, you can use an ssd, its far more stable,faster and alot more memory.

@mySD_ Жыл бұрын

Great video! Do you know how much Ib this solenoid can handle? If I want to use this setup to build a trapped door for an ice dispenser, for example?

@jorgerojas6443 2 жыл бұрын

Thank you so much for the video! Do you have a project where facial recognition is carried out so that the relay can be opened?

@Core-Electronics 2 жыл бұрын

No problem mate. Take what you have learned here and apply it to the Face Recognition Script you can find in the guide here - core-electronics.com.au/tutorials/face-identify-raspberry-pi.html You'll be opening and closing doors in no time 😄

@joshualavers235 Жыл бұрын

Is back EMF an issue to be worried about? When is it necessary to be using opt-isolated relays? PS. Love your videos and all the others by the Core Electronics team.

@Core-Electronics Жыл бұрын

The relay used here has all the circuitry (most importantly a correctly placed diode on the PCB) to manage the Back EMF that this solenoid produces. If your working with much larger solenoids (or other back EMF producing hardware like DC Motors) with much higher voltages, an Optically Isolated Relay makes perfect sense. Thanks so much for your love 😊❤️ hope you have a fantastic week!

@flickmew99 11 ай бұрын

@@Core-Electronics so in general most relay modules have a back EMF diffuser mechanism such as flyback diode? I also wanna ask why it's fine to connect the 5V relay's VCC to 3.3V of RPi ? Thank you for this comprehensive tutorial

@vasudhadighole2671 11 ай бұрын

Can i make this project with supplying power just to the raspberry pi instead of both the raspberry pi and solenoid? Like instead of needing 2 power sources.

@jonathanlim1775 5 ай бұрын

hi i have issue, connected using 3.3v but relay doesnt work, red led indicator shown, however if connected to 5v the relay works but it will keep turned on. please advised on the steps or approach. Using SONGLE relay module 5v

@seangahan1298 2 жыл бұрын

I have a question: I have a project which I just started working on that is similar to your video, my set up though has a 12v system using a momentary push button and I need to see the event using the RPI. My question is on the relay, are they bi-directional meaning if I hook the button to the 12v side and clicked the button would I see the event on the 3.3v side of the relay? Thank you in advance.

@Core-Electronics 2 жыл бұрын

So take the time to check all the Specification Sheets, but with the right Relay you should be able to control a 12V system using a Raspberry Pi. That is one of the great things about relays allowing you to mechanisms on a higher voltage/current which are activated by a lower voltage/current device. Naturally plugging 12V electricity directly into a Raspberry Pi Board is a big no go though.

@jaxus6626 Жыл бұрын

Question: does the 5v relay module can also work in raspberry pi 3 b+ with this tutorials?

@ibrahimmolero2096 2 жыл бұрын

Hi Tim, Excellent tutorial! I have a question, is it possible to connect six 5v solenoid with a raspberry pi working all together at the same time? I'm working on a Braille project for donate to blind kids. I hope you can help me. Thanks!

@Core-Electronics 2 жыл бұрын

Hey mate 😊 big thanks. I think I found the perfect product for you, the linked product will give you 8 Relays on a HAT that you can use to control the 8 Solenoids. core-electronics.com.au/catalog/product/view/sku/CE08528 Love the idea of the project! Come do a write up at our forums when your done.

@jerrygodson5094 Ай бұрын

are you certain connecting the positive end of my 5v relay to the 3.3 pin wont burn out my raspberry pi?

@jyvben1520 Ай бұрын

use the 5v pin on the rpi

@omega134 7 ай бұрын

Great video would i work with the Pi Zero WH ?

@Core-Electronics 7 ай бұрын

It should be able to work, the Pi Zeros have the same 40 pin layout

@andrewrider3965 2 жыл бұрын

Hi Tim, would this general set up work with the 36v solenoid for sale on your website? Also, could you power the raspi and solenoid with batteries, as opposed to mains power?

@Core-Electronics 2 жыл бұрын

Heyya mate, if your talking about the 36V Solenoid I have linked then even though the datasheet states that the solenoid is rated for 36V they will work like a charm at 12V - core-electronics.com.au/solenoid-36v.html - And so long as you supplied the solenoid with 12V, the Raspi with 5V and had enough current available you absolutely can power the system from batteries.

@andrewrider3965 2 жыл бұрын

@@Core-Electronics Thanks, I really want to operate it at the full 36V, because I need the solenoid to "pack a punch"!! I'll be using a separate 36V battery for the solenoid and probably a 5V/3A battery for the Pi, but do you think the 5V/3A battery will have enough "juice" to trigger the relay?

@Core-Electronics 2 жыл бұрын

@@andrewrider3965 That should be a good amount of current, the Spec sheet recommends 2.7 amps at 36 Volts so you are within the ballpark.

@dmkchannel5572 2 жыл бұрын

can i know why i flw your step but also cannot if i use the solenoid in power supply can, but in the raspberry cannot.

@benignoambus4283 2 жыл бұрын

do have a video on how you will control this from c# form application?

@Core-Electronics 2 жыл бұрын

Not on C# form application but I have got a video on using Tkinter to create GUI, perhaps worth a look. core-electronics.com.au/tutorials/Tkinter-Python.html

@TheChrisPutnam Жыл бұрын

I built this exactly the same as you - the green light on the relay turns on and off at intervals but it doesn't seem to power the 12V side - is it because my relay is too cheap and doesn't work with 3.3V ?

@rinokurian6299 2 ай бұрын

i have the same problem. Any solution ??

@jamiegough47 2 жыл бұрын

For the project I'm working on I need 6 12v solenoids which I planned on using an 8 channel relay for with the raspberry pi. How would I need to go about powering each solenoid? They would only be switched on one at a time for very short bursts. Is there any way to power them all with one supply? Thanks in advance

@Core-Electronics 2 жыл бұрын

The Raspberry Pi needs to be at 5V, so to eliminate the need for that power-supply you can use a step down converter like this one and then pull the power for the Pi from the Solenoid Power supply - core-electronics.com.au/catalog/product/view/sku/ADA1385 Also check out this 4 channel relay module - core-electronics.com.au/catalog/product/view/sku/CE05279 Make a forum post and we can help you even more if you need 😊

@Core-Electronics 2 жыл бұрын

Also take a look at this - core-electronics.com.au/catalog/product/view/sku/DEV-14150

@jamiegough47 2 жыл бұрын

@@Core-Electronics thankyou! :)

@superliegebeest544 2 жыл бұрын

Hello, I have a question about the raspberry nano and pico, they dont operate on 5v but 3,3v can they operate these relais, or do u need a stepup something in the middle?

@Core-Electronics 2 жыл бұрын

The exact Relay you see in the video will work just fine with the Raspberry Pi Pico. In the Specification on the Product Page you will see this - While marked as a 5V supply voltage & input signals, we have found this to work fine at 3.3V - core-electronics.com.au/catalog/product/view/sku/CE05137

@superliegebeest544 2 жыл бұрын

Rhanks, I am.still in doubt if I should go for arduno and a pi as server or everything pi. I lean more to everything pi. I want to connect everything by utp. And I dont like to solder, so I meed shields/hats for all sensors and.a couple.of.motors. real headach to figire it out.

@Jdog-np6oi 2 жыл бұрын

Can I use multiple relays attached to the rassbeery pi? I would need around three total

@Core-Electronics 2 жыл бұрын

Absolutely. And if you needed to control even more that that I would recommend using this HAT core-electronics.com.au/adafruit-16-channel-pwm-servo-hat-for-raspberry-pi-mini-kit.html

@neurodavidus 2 жыл бұрын

@@Core-Electronics Thanks so much for this video and your replies to comments. I would need to control 16 solenoid (DC 12V). COuld I use 16 relays connected to 16 solenoids? Would there be issue of the relays share the same 3.3V power from the PI? Regarding your suggestion about using the above HAT, I am not sure it work for solenoids that need 12 V (looks like it is for driving servo motor of 5 V). I am not very experienced so any comment suggestion super welcome. thanks a lot

@Jdog-np6oi 2 жыл бұрын

I have been using this setup for about two weeks no with no issues. However for the past 2 days whenever I turn on my rasberry pi and run the code, I will get to clicks (activations of the solonoid) and then the screen go black and the computer crash. Please if you have any fixes to this let me know. Thanks, Jdog

@Core-Electronics 2 жыл бұрын

That is weird, perhaps the Micro-SD card has slightly corrupted. If re-flashing the card doesn't work send through some pictures of your set-up to our forum and we'll figure it out.

@davyS4v Жыл бұрын

Excuse my ignorance, by replacing the solenoid with a 230v electric motor, could I activate with the same scheme? Obviously I'll have to feed the engine with 230 instead of 12v, right?

@Core-Electronics Жыл бұрын

Definitely so long as its a DC Motor. You need to have a Relay that can manage that level of Voltage and Current. Also 230Volts can easy stop your heart and kill you before you hit the floor. I'd only mess around with it if you are an electrician. DC Motors can run at various voltages with less efficiency. You may just be able to run your motor at a safer ~28V which, in that case, you could use this relay here - core-electronics.com.au/5v-2-channel-relay-module-10a.html

@aymenzidane7130 2 жыл бұрын

Thank you so much. But, is it confirmed that 3.3V will make all the 5V relays work?

@Core-Electronics 2 жыл бұрын

For this particular gear absolutely. Check the specification sheet to find out whether a particular component is capable of running at lower voltages.

@aymenzidane7130 2 жыл бұрын

@@Core-Electronics Thanks a lot

@brettgreiner8740 3 ай бұрын

When the relay is actuated and it the solenoid changes states, is it constantly being powered until the relay is again actuated back? Or is the solenoid only powered in for a moment when it switches states?

@Core-Electronics 3 ай бұрын

Hey Brett, the relay acts like a switch and when it changes state, it will keep powering the solenoid until the relay is turned back off

@vikaskadel858 2 жыл бұрын

what is this connector called which is used to connect 12v supply with jumper cables?

@Core-Electronics 2 жыл бұрын

I got you, its a DC Barrel Plug, you can find it here - core-electronics.com.au/dc-barrel-plug-to-2-pin-terminal-block-adapter.html

@MicaseHD 2 жыл бұрын

I want to make A mini jackhammer out of a push pull solenoid. I don't know how to make it work like a jackhammer?? like 'Push and pull' is one cycle like a jackhammer. I have been trying to find out how for like 4 days now. is there a little pcb board that can do this or control it?

@Core-Electronics 2 жыл бұрын

Haha I love the idea, although once complete it will be more of a prop than a fully functioning Jackhammer. The solenoid doesn't have as much strength as compressed air. You can control the solenoid to open and close rapidly by altering the Python Scripts I provided here, you could also use an Arduino like this - core-electronics.com.au/guides/solenoid-control-with-arduino/

@benignoambus4283 2 жыл бұрын

can you integrate this to a c# window form application?

@Core-Electronics 2 жыл бұрын

You could, if your interesting in creating GUI to control the solenoid another option would be using Tkinter that works in the Python Programming Language

@minecraft6130 3 жыл бұрын

Is there such a thing as a normally closed solenoid of this same type for the pi? i.e. - when relay actuated, it makes solenoid rise, then falls back when relay opened again.

@Core-Electronics 3 жыл бұрын

The lock solenoid designs that I have encountered are all extended when un-powered. Pop us a message on our forum and we can help you further - forum.core-electronics.com.au/

@minecraft6130 3 жыл бұрын

would it be safe to have a normally open solenoid always not extended?

@Core-Electronics 3 жыл бұрын

Heyya, if you keep a solenoid active for a long time (>20 minutes ) it will get too hot to touch. Thats the limiting factor.

@Four_Eyes 2 жыл бұрын

this is how to youtube

@maricelcarney6805 Ай бұрын

HI, do know how can i connect this for facial recognition and use microsoft azure face api?

@delacruzerickson539 11 ай бұрын

Hello dude, I have an 12 volts solenoid, is it okay to use 12v relay module?

@ErbyST 2 жыл бұрын

I'm getting a sudo verification error when trying to add my Rpi, can you give me guidance of what I need to look for or change ?

@Core-Electronics 2 жыл бұрын

How wierd! If you make a forum post, link in video description, and copy and paste the error your having issues with, that would be the most effective way to troubleshoot and fix it.

@FrankP83 Жыл бұрын

i've the exactly same schema, but i'm using Arduino and a solid state relay, i can see the led of the relay turning on, but the solenoid doesn't click...i don't have the short between the 2 pins of the relay...i really don't know why...

@XDVER0 2 жыл бұрын

Why are you not using a diode to protect against voltage spikes?

@Core-Electronics 2 жыл бұрын

The relay is able to do the job of the diode in this set up as it has inbuilt voltage spike protection.

@XDVER0 2 жыл бұрын

@@Core-Electronics however, since the relay also has a electromagnet built in, it needs a diode on it's own. Or not?

@scorpions333z 2 жыл бұрын

good, I want to realize that I can turn on my miner remotely, can I get it? which Raspberry P buy? Thank you

@Core-Electronics 2 жыл бұрын

Come pop us a message on our forum 🙂 that way we can get our whole team to help you.

@sanedmohamed2909 Жыл бұрын

I have an application already built it C# which prints out a label. I would like to make changes so that when the user clicks on print a solenoid opens and sprays water into the box. Is this possible? Can I interact with Raspberry PI in C# ?

@Core-Electronics Жыл бұрын

You can absolutely run, build and test Scripts written in C#. Here is a really nice guide to get you up to speed 😊 carmalou.com/raspberry-pi/2017/04/21/code-c-sharp-on-a-raspberry-pi-in-5-minutes.html

@xerxel69 Жыл бұрын

Why no pull down resistors?

@cristianpeter9478 Жыл бұрын

I've got a problem, I've done the connections just like you and connected everything, but it doesn't work, the green led switches from on and off but the solenoid lock doesn't work. The only thing different from your project is that i've used is a 12V 1A DC power supply, can this be the reason it doesn't work?

@BrianThomas 16 күн бұрын

Why can't you use a 5v dc to 12v dc boost convert instead of using 12v mains power?

@Core-Electronics 13 күн бұрын

If you are looking at powering the Solenoid, you could definitely use a buck converter! As long as it can supply enough current for the solenoid to actuate.

@lanetimepditty Жыл бұрын

Why put parenthesis around the "True" in the while loop?

@Core-Electronics Жыл бұрын

Absolutely a good point, those parenthesis are not needed for the script to run. I think it just helped me best understand the script as I was doing it.

@teddylu6295 3 ай бұрын

Will this also work with a raspberry pi pico and the very same relay?

@Core-Electronics 3 ай бұрын

That relay is designed to work with a 5 Volt signal, but we've found it to work at the 3.3 Volt signals the Pico uses. We also have a dedicated guide to relays for the Pico if you want to check it out: core-electronics.com.au/guides/digital-electronics/getting-started-with-relays-examples-with-raspberry-pi-pico/

@skd7626 2 жыл бұрын

How much current can raspberry give out from gpi pin ,want to control a pump with solid state relay if possible, plzz reply

@Core-Electronics 2 жыл бұрын

The operating voltage of the GPIO pins is 3.3v with a maximum current draw of 16mA. As the Relay will be managing the heavy current/voltage needed for the pump, it isn't too important what current the Raspberry Pi can give out. Just so long as it is enough to activate the relay on and off.

@jerrygodson5094 Ай бұрын

would this work if i used a smaller solenoid

@Core-Electronics Ай бұрын

Yes it will!

@stephinsiby1525 Жыл бұрын

Is the 12 v power supply damage the relay

@cadmarins 5 ай бұрын

You are mistaken and missed details. The power supply is only supplying the load and the relay can work on the NO/NC contacts and common contact safely within the 10A/250V AC or 10A/30V DC specifications. The "VCC" pin that caused you confusion will have 5V because the Raspberry was powered by USB

@pedrom.l.230 3 жыл бұрын

What happend if the realy is 12 vdc ? It will work at the same ?

@Core-Electronics 3 жыл бұрын

If you tried to use a 12 Volt relay it would never actuate as the maximum voltage that the Raspberry Pi can provide is lower.

@yonatan2608 3 жыл бұрын

why do you attach the 3.3V pinout to a 5V relay?

@Core-Electronics 3 жыл бұрын

Excellent question. This Relay is labelled as 5V but we can run it at 3.3V with no problem. To run this Relay the Supply Pin (Vcc) Voltage needs to be the same as the Logic Level Voltage (IN) Pin. Connecting the Relay to the 3.3V Pin means the High Signal will trigger at 3.3V and the Low Signal trigger at 0V. Max Signal Voltage from a Raspberry Pi GPIO is 3.3V so it can work. If instead we connected to the 5V Pin the High Signal would only be triggered at 5V and the Low Signal triggered at 0V. Max Signal Voltage from a Raspberry Pi GPIO is 3.3V so it would not be able to trigger the High Signal on the Relay. Hope this helps!

@yonatan2608 3 жыл бұрын

Amazing answer! Thank you.

@hungtruongvanviet7324 11 ай бұрын

@@Core-Electronics thanks, it's useful

@Mike-qd6lb 10 ай бұрын

You might be better using the pi for home assistant, then use esp32 boards or 8266 boards as the micro controller, to control the electrical signal, home assistant is a very powerful system and your already doing most of the processes required to utilise it, and affords a wider scope of operations/ functions, just a thought for anyone going down this route.

@goyoub7549 2 жыл бұрын

I have a excavator , can i control the solenoid by this ideas ? because my electric system is gone . Thank you

@Core-Electronics 2 жыл бұрын

So long as you have power this system will be able to control a solenoid :) and you can scale if up if need be.

@ShivamSharma0720 2 жыл бұрын

cab we use a 5V solenoid ??

@Core-Electronics 2 жыл бұрын

You definitely can, just make sure to use a 5V Power supply 😊

@boomfunkk4253 2 жыл бұрын

I'm attempting to do this remote through ssh with VS code, but from some reason after installing all the dependencies and packages I can't use "import RPi.GPIO" its like it doesn't exist

@Core-Electronics 2 жыл бұрын

Heyya mate, using GPIO through SSH remotely seems to have some intricacies that I've only just become aware of. Come give this a look here - gpiozero.readthedocs.io/en/stable/remote_gpio.html and this here stackoverflow.com/questions/52678458/python-over-ssh-event-detect-not-working . Hopefully that will help solve your issues

@EEZYEEEE 2 жыл бұрын

How many solenoids can one raspberry pi control independently?

@Core-Electronics 2 жыл бұрын

The main focus is how many relays can the Raspberry Pi control which will then be used to activate the Solenoid. You should be able to control at least 2 relays using this method but there are some fantastic Relay HATS for the Raspberry Pi which will let you control more. You can also use I2C expanders to control many many more (check the following links for examples of these). core-electronics.com.au/catalog/product/view/sku/CE04864 and core-electronics.com.au/catalog/product/view/sku/DEV-14150

@CodingAbroad 2 жыл бұрын

Can you control raspberry pi with javascript instead of python?

@Core-Electronics 2 жыл бұрын

You definitely can, Node.js is what I'd recommend if you were to start. Its not installed by default and there are some different versions to choose from. This should help - thisdavej.com/beginners-guide-to-installing-node-js-on-a-raspberry-pi/

@CodingAbroad 2 жыл бұрын

@@Core-Electronics thanks for the info ☺️ my ultimate project is to make a small pinball machine using raspberry pi 4 using windows and javascript. Do you think that’s possible?

@Core-Electronics 2 жыл бұрын

Oh yes I do! Just check out what I was looking at yesterday. This Pinball machine is all controlled via a Raspberry Pi 4 - kzfaq.info/get/bejne/fMeagaiXua2caYk.html

@Euripides_ 2 жыл бұрын

Why do you tubers talk like that, with the upward inflections and enunciating every full stop? lol - great vid tho

@jesuschris9543 Жыл бұрын

Makes it easier to splice together different takes.

@FIstof7LEGEND 2 ай бұрын

He’s just an Australian…

@nowdatsfresh Ай бұрын

Why not just suggest that people get a 3.3v relay or a relay hat designed for the Pi instead of using a 5v relay that "works fine"? I can imagine a scenario where someone buys a 5v relay off Amazon, finds it doesn't work with the 3.3v pin, tries it with the 5v pin, and fries their Pi. Would it be that hard to just stock a 3.3v relay or a hat?

@admin8784 5 ай бұрын

You need a snubber diode

@samihatahiti2385 2 жыл бұрын

I used the same code but the door is only unlocked. Lock part is not working

@Core-Electronics 2 жыл бұрын

Using a solenoid like the one in this guide won't be powered in the locked position. If it was it would gradually overheat. The way that it locks is based on the shape of the latch. When it is in locked position it physically won't be able to open as it will bump up against the female side of the latch. Only when the solenoid is activated and pulls the latch back will you be able to open the door.

@zerocool8863 2 жыл бұрын

How would I know end the loop to a simple open then lock? Instead of it constantly looping the process???

@jyvben1520 Ай бұрын

1:50 top red line goes to 3.3v on rpi, should be 5v for the 5v relay, on relay NC normally closed (here 12v power to solenoid = bad), NO normally open (no power to solenoid) 4:06 while (True): why add the () it is useless