#132 in Industrial & Scientific
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Reddit mentions of SainSmart 4-Channel Relay Module

Sentiment score: 6
Reddit mentions: 24

We found 24 Reddit mentions of SainSmart 4-Channel Relay Module. Here are the top ones.

SainSmart 4-Channel Relay Module
Buying options
View on Amazon.com
or
    Features:
  • 5V 4-Channel Relay interface board, and each one needs 15-20mA Driver Current
  • Equipped with high-current relay, AC250V 10A ; DC30V 10A
  • Standard interface that can be controlled directly by microcontroller (Arduino , 8051, AVR, PIC, DSP, ARM, ARM, MSP431, TTL logic)
  • Indication LED's for Relay output status
Specs:
Height1.19 Inches
Length4.5 Inches
Number of items1
Size4-Channel
Weight0.000625 Pounds
Width3.2 Inches

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Found 24 comments on SainSmart 4-Channel Relay Module:

u/Nexustar · 4 pointsr/3Dprinting

Not just from prusa, pick and choose. URLs for examples.

Digital caliper, 12" https://www.amazon.com/gp/product/B000EJUBBU/ref=oh_aui_detailpage_o02_s00?ie=UTF8&psc=1

Extra brass nozzles.

Hardened steel nozzle, 0.4mm to 0.6mm for printing abrasive exotics (wood, glow in the dark, carbon fiber etc)

Print removal tool https://www.amazon.com/gp/product/B00VB1U886/ref=oh_aui_detailpage_o02_s01?ie=UTF8&psc=1

Locktite blue bolt-fixer (Walmart, Home Depo, Lowes etc) to stop bed sensor from moving.


High temp anti-seize for nozzle threads https://www.amazon.com/gp/product/B0053ZS1Z8/ref=oh_aui_detailpage_o02_s01?ie=UTF8&psc=1

Raspberry Pi 3, 5v Pi 2A Power wart, Micro SD card, & Webcam for octoprint monitoring.

Relay board for Pi/octoprint to power up & down printer remotely. https://www.amazon.com/gp/product/B0057OC5O8/ref=oh_aui_detailpage_o04_s02?ie=UTF8&psc=1

1lb of silica gel to keep filament dry.

Filaments, various.

Fire extinguisher rated for electrical fires.

Dedicated smoke alarm.

u/impala454 · 3 pointsr/AskElectronics

This is the relay board I'm using. I'm going to use two separate arduinos to turn each one on (using "or" logic). I don't have a lot of experience using diodes, what exactly would I use? And do you mean literally I do:

Arduino1->Digital out->diode->Relay input1, then
Arduino2->Digital out->diode->Relay input1

u/chlorobot · 3 pointsr/gardening

I'm currently struggling with the same problem with my project.

You'd probably want to put a DHT11 in each pot attached to GPIO on the Pi.
The soil RH (relative humidity) could be used to determine whether to power a 12v pump or solenoid valve (if gravity fed).

Relays are super easy to set up and control using a Pi and relatively safe at 12v. The difficult question here is how to direct the water into whichever pot requires what amount of water. A naive approach is one pump per pot but that could get costly... hmm

I'm using this pump

I'm using this relay

Here's the code to read digital Celcius and RH from the DHT

I'm also considering adding an additional 'misting' nozzle to help control my super-hot (not ideal) environment :

Soil > Tempenature : 37.0 Humidity : 77.0


Feel free to follow up in PM if you have any questions.

u/wolfcry0 · 2 pointsr/arduino

Yeah, the arduino can supply only a couple mA from each IO pin, that pump likely needs 500-1000mA to run.

You can also use a relay for a more simple setup, like this board for example, it will let the arduino switch high current loads like the pump easily.

u/DeletedOriginal · 2 pointsr/MPSelectMiniOwners

The relay setup and wiring is not hard but it can be a bit confusing at first until you figure out the GPIO wiring and setup. With my setup I can control a power strip that the Pi (via Octoprint menu entry) can turn on or off via the relay as well as having LED lighting inside my enclosure controlled that can also be controlled from Octoprint. If you want to give it a go just pick up a relay and some connectors to wire it to the GPIO pins. Feel free to hit me up once you have the hardware and I can share my wiring and Pi GPIO config with you so you can get going quickly. I like the 4 channel relays since they are only a few bucks more than the 1 or 2 chan versions and it allows you to add devices in the future. They are under $10: https://www.amazon.com/gp/product/B0057OC5O8/ref=oh_aui_search_detailpage?ie=UTF8&psc=1

u/LittleHelperRobot · 2 pointsr/arduino

Non-mobile: Here's a relay

^That's ^why ^I'm ^here, ^I ^don't ^judge ^you. ^PM ^/u/xl0 ^if ^I'm ^causing ^any ^trouble. ^WUT?

u/lampar0 · 2 pointsr/AskEngineers

I would replace your discrete components with an Arduino Pro Mini. You can connect three output pins to some relays, and drive the LEDs with a 5V power supply. You'll probably want to put a resistor in series with each LED, instead of one resistor for the whole string, to minimize risk of damaging them: (5V-3.4V)/.025A = 64Ohms, so use somewhere between 50 and 75 Ohms for each LED. Alternatively, you could run the whole thing on 3.3V and skip the resistors, but those power supplies aren't so common. In that case you'd want the 3.3V Arduino. PM me if you need help programming the Arduino, it's pretty easy.

u/Space_Cadet77 · 2 pointsr/matlab

I didn't have a relay picked out yet, I'm kind of in the brain storming stage right now. I came across this board on amazon and thought it might do the trick:
https://www.amazon.ca/SainSmart-101-70-101-4-Channel-Relay-Module/dp/B0057OC5O8/ref=sr_1_21?ie=UTF8&qid=1486504628&sr=8-21&keywords=usb+relay

It says it has a Standard interface that can be controlled directly by microcontroller (Arduino , 8051, AVR, PIC, DSP, ARM, ARM, MSP431, TTL logic)

Maybe i'll give it a go.

u/[deleted] · 2 pointsr/amateurradio

Currently it's an Arduino running an AD9851 module which is then connected to a pretty shameful homebrew amp. I also have it connected to a cheap relay board. One relay is used to switch power to the amp, the other switches the antenna feed between the amp output and the SDR chain (preamp, Ham It Up, RTL-SDR).

For software I've written some stuff to send RTTY and Morse.

u/Modna · 2 pointsr/robotics

Have no fear! You have a simple task ahead of you.

If I was doing this, I would use the following:

  1. Relay Board
    This bad little boy can handle 250 VAC at 10 Amps (which is going to be way more than you need). It has 4 relays, so you could control up to 4 drills or other widgets if you needed to. Each relay has a NO (normally open), NC (normally closed), and C (common) Contact.

  2. Arduino Uno
    This little bad boy is how you control that relay. You can write a very simple program on your computer that you put on this device (I am talking like 3 lines of code) that will turn a digital output on for 7 second, then off. Hit the reset button and it does it all over again! The digital output on this board will get a wire stuck over to the input on the Relay board above.


    How this all works: Take a simply extension cord (unplugged, obviously) and open up the insulation. There are usually 3 wires in it, black, white, and green (these can vary, so be careful and choose correctly). Take the Black or White wire and cut that bitch. One end of the cut wire can be stuck into the common terminal of the relay board. The other end can be stuck into the NO (normally open) terminal. What this will do is that when the Arduino board sends 5 volts to that relay, it will switch. This will connect the Common and NO terminals together, allowing power to flow through it to the drill. On the drill end I would just zip-tie or rubberband the trigger so it goes on when the relay changes.


    CAUTION 120 volts or 220 volts (depending on where you live) can be very dangerous!!! That relay board will have open terminals. Because of this I would HIGHLY RECOMMEND that you put it in some kind of plastic case. I would also run electrical tape over the pins on the underside of the board to make sure you can't zap yourself.

    When I get home I can draw you up a wiring diagram if you like and I could give you the basic code you would need.

    Good luck!
u/SnowdogU77 · 1 pointr/arduino

[Here's a relay] ( http://www.amazon.com/gp/aw/d/B0057OC5O8?qid=1427254414&sr=8-6&vs=1#)

Wiring is pretty intuitive.

12v DC > Relay 1 blue connector 1

Motor positive wire > Relay 1 blue connector 2.

Connect Arduino ground and digital IO (set to output) pins to the pins associated with the relay that you chose, raise the DIO pin to High, and the relay will connect the motor to the power supply.

Technical note: These relays trip at 15-20ma, so there shouldn't be any issues using a DIO pin. If you choose a different relay, MAKE SURE the relay input draws less than 40ma, otherwise you may damage your Arduino. This relay board is also protected by diodes, so your Arduino is shielded completely from the 12v.

u/NSLbot · 1 pointr/NSL

arclight: yeah, i'm liking the idea of the board though. But I ended up buying http://www.amazon.com/gp/product/B0057OC5O8/ref=oh_details_o02_s00_i00?ie=UTF8&psc=1

u/spatzonfloor · 1 pointr/arduino

Hi Shadow, thanks for the response, the relay I'm using is this one from Amazon.

I connected the relay to the 5V power rail that's hooked up to the Arduino. The ground for the relay is connected to the ground of the Arduino. The signal wires are directly hooked up to the Arduino digital outputs (5,6,7). I have a photo of the circuit, but I must admit it's not the best picture.

http://i.imgur.com/tDr0nTw.jpg

Another thing I noticed, was that this occurred even when I disconnected the Arduino and just ran a 12V source through the component, it was worse when it was connected to the Arduino.

u/Pocok5 · 1 pointr/AskElectronics

The 120V part is the easiest and the most dangerous, so pay attention to it. A relay module like this acts like an SPDT switch ("changeover/three way switch") - or more like 4 of them. The light are wired up to the relays just like you'd wire up an ordinary room light to a switch.
The arduino just connects to the little pin header on the bottom and is completely isolated from the high voltage.

r/Arduino will be able to help you write the code (you'll only need the basics for this). IDK why the post was nuked, but you can make a new one asking about the optocoupler tapping of the speaker - it will require a bit of poking around to get an idea what sort of thing is going on in the speaker wires.

u/djkrugger · 1 pointr/AskElectronics

Yeah, if you're not very experienced in electronics better stay with something already tested, specially for anything mains related!. Probably you could use one of these arduino relay boards, they're fairly cheap and are opto isolated to keep things safe.

u/KiltedCajun · 1 pointr/AskElectronics

I ended up buying this relay module so I can actually switch both the lamp and the printer from the Pi.

u/MxedMssge · 1 pointr/raspberry_pi

Exactly, yes! Everything that requires precise timings, instant response, and/or 5 volt logic would be on the Arduino and the Pi would just handle user interactions.

You could just get an Arduino Uno 3, that's kind of the standard Arduino board especially for people just learning. I just prefer the Mega because it is beefier and has way more GPIO pins. But the Uno 3 has enough to run three relays and your IR sensor easily (which has both 3.3 V and 5 V logic, meaning it can work with the Pi and Arduino respectively).

Speaking of relays, I really like the SainSmart ones and have never had an issue with them. This four-relay module is only $10:
https://www.amazon.com/SainSmart-101-70-101-4-Channel-Relay-Module/dp/B0057OC5O8/ref=asc_df_B0057OC5O8/
Only thing is, and you might know this already, these things are pull-down rather than up. Meaning instead of pushing a 5V signal straight from a digital GPIO pin on the Arduino straight to the relay, you have to use a transistor to basically invert the signal. When the Arduino activates the transistor, it allows the pin on the relay board to go to ground which turns it on. Also, don't forget to always wire so the power off side is your closed side for all valves and such! The last thing you want if a board dies is to have the relay that controls your solenoid valve to default to power on, dumping all your liquid!

It definitely is overwhelming at first, but once you get really confident it opens up a whole new world of fun engineering!

u/NaLaurethSulfate · 1 pointr/arduino

This.

I got one of these recently and it seems to work fine. Fairly cheap, super easy to use.

u/fnordfnordfnordfnord · 1 pointr/HomeImprovement

Not much to see yet. So far it is an R-pi, a few DHT11, a relay module, one (or maybe more) cheap PIR motion detectors, and a toggle switch.

I'm using Monkey webserver, and playing with some cgi scripting. I started piddling with HTML5, and I want to try to make it as nice as I can, but I am not a web developer, so I am having to slog through some of this. If it goes well, I might make a post in here or in /r/HomeAutomation

u/iammrh4ppy · 1 pointr/AskElectronics

Wow Thanks for the descriptive response!


I'm not very great at electronics, but here is the exact switch I'm using.

As for power source, I'm probably going to use 110 VAC to power the 4 ch relay board. http://www.amazon.com/SainSmart-101-70-101-4-Channel-Relay-Module/dp/B0057OC5O8

This is the solenoid I will be using


Thanks! Your post really helped me think it through. Just need to put it to work lol.

u/UtahJarhead · 1 pointr/raspberry_pi

I recommend that you swap to using a 4 channel relay for handling the power cutoff and supply. You can use a 2 channel, but the price difference is $0.80.

The setup and control of the relays is so simple and with the price, you can't beat it. It also takes the guess work out of many of the homemade connections.

HOWEVER...

First thing is to check the relay. You have 5v on one side, 3v3 on the other. Do you have a level logic converter in the relay? Otherwise, those transistors may not recognize the 3v3 fully to flip.