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SainSmart 4-Channel Relay Module

4.6 4.6 out of 5 stars 427 ratings

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Current Rating 10 Amps
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About this item

  • 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
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$8.99
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$27.60
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  • Product Description

    This is a 5V 4-Channel Relay interface board, Be able to control various appliances, and other equipments with large current. It can be controlled directly by Microcontroller (Arduino, 8051, AVR, PIC, DSP, ARM, ARM, MSP430, TTL logic).

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    Price$8.99$7.39$7.39$7.99$9.99$15.99
    Delivery
    Get it as soon as Tuesday, Mar 19
    Get it as soon as Tuesday, Mar 19
    Get it as soon as Tuesday, Mar 19
    Get it as soon as Tuesday, Mar 19
    Get it as soon as Tuesday, Mar 19
    Get it as soon as Tuesday, Mar 19
    Customer Ratings
    Easy to use
    4.3
    4.5
    4.7
    4.4
    4.3
    3.8
    Value for money
    4.3
    4.4
    4.4
    4.5
    4.1
    4.3
    Quality of material
    4.2
    4.5
    3.6
    Sold By
    SainSmart Official
    HiLetgo
    HiLetgo
    SunFounderDirect
    ELEGOO Official US
    SainSmart Official
    contact type
    /
    Normally Open
    Normally Open, Normally Closed
    Normally Open, Normally Closed
    max switch current
    10 amps
    10 amps
    10 amps
    10 amps
    10 amps
    12 amps
    250 volts
    250 volts
    250 volts
    250 volts
    coil voltage
    5 volts
    5 volts
    12 volts
    5 volts
    5 volts
    12 volts
    operation mode
    Automatic
    Automatic
    Automatic
    Automatic
    Automatic
    Automatic

    Product information

    Technical Details

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    Warranty & Support

    Product Warranty: For warranty information about this product, please click here

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    SainSmart 4-Channel Relay Module


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    From the brand


    From the manufacturer

    SainSmart 4-Channel 5V Relay Module

    Package Content:

    1 x SainSmart 4-Channel 5V Relay Module

    More Manual instruction please refer to our site.

    SainSmart 4-Channel 5V Relay Module

    5V 4-Channel Relay interface board, and each one needs 15-20mA Driver Current

    - Equiped with high-current relay, AC250V 10A ; DC30V 10A.

    - Standard interface that can be controlled directly by microcontroller (Arduino , 8051, AVR, PIC, DSP, ARM, ARM, MSP430, TTL logic active low).

    - Opto-isolated inputs.

    - Indication LED’s for Relay output status.

    Product information

    This is a 5V 4-Channel Relay interface board, be able to control various appliances, and other equipments with large current.

    It can be controlled directly by Microcontroller (Arduino, 8051, AVR, PIC, DSP, ARM, ARM, MSP430, TTL logic).

    Item weight: 0.2 pounds.

    Customer reviews

    4.6 out of 5 stars
    4.6 out of 5
    427 global ratings

    Customers say

    Customers like the performance, quality and value of the relay board. They mention that it works well with any microcontroller and that it has high quality relays. They also appreciate the ease of use and responsiveness. They say it's a great little board quick and easy to use. Customers also like the appearance and the leds. However, some customers dislike the documentation.

    AI-generated from the text of customer reviews

    105 customers mention87 positive18 negative

    Customers like the performance of the relay. For example, they say it works well, is well-made, and works well with any microcontroller with GPIO pins. Some say it's great with Raspberry Pi and has a great deal of functionality for the price.

    "The entire SainSmart line is well made, very well priced, and extremely functional, a great buy...." Read more

    "Great with Raspberry Pi!This thing is super responsive. It's worth every penny and then some. It's been a great joy working with it...." Read more

    "...Pros:o Works as advertised.o A great deal of functionality for the price..." Read more

    "...I was happy with everything about the board. It worked just fine, looks like good quality workmanship coming from the SainSmart company which I..." Read more

    54 customers mention54 positive0 negative

    Customers are satisfied with the quality of the relay board. They mention that it is well-made, and has high-quality relays. Some say it is a wonderful little board and perfect for their needs. Overall, customers are happy with their purchase and recommend it to others.

    "The entire SainSmart line is well made, very well priced, and extremely functional, a great buy...." Read more

    "...It worked just fine, looks like good quality workmanship coming from the SainSmart company which I understand is a "knockoff" maker of Arduino..." Read more

    "This little thing is pretty fantastic...." Read more

    "...Works perfectly, excellent quality. When you get it, you'll discover that the 4 outputs each have NO/NC contacts...." Read more

    34 customers mention30 positive4 negative

    Customers find the product easy to use. They say that it is fairly simple to use and there are multiple tutorials available via a website. They also mention that controlling the relays was simple, they had no problems setting it up, and it was very easy to wire. Overall, customers find the 4 relay board to be a great product that is easy to work with and very handy for electronic projects.

    "...It's worth every penny and then some. It's been a great joy working with it...." Read more

    "...It was also fairly cheap, and simple to control. Screw terminals actually hold wires in. All in all, 5/5 and would buy again." Read more

    "...It is fairly simple to use and there are multiple tutorials available via a Google search." Read more

    "Control your AC and DC devices using these relays. Very simple use with the Arduino...." Read more

    27 customers mention27 positive0 negative

    Customers appreciate the value of the relay. They say it's a great buy and a good set of relays.

    "The entire SainSmart line is well made, very well priced, and extremely functional, a great buy...." Read more

    "...This thing is super responsive. It's worth every penny and then some. It's been a great joy working with it...." Read more

    "...Nice toy for the money." Read more

    "...It works well going on about 3 months now. It was also fairly cheap, and simple to control. Screw terminals actually hold wires in...." Read more

    12 customers mention12 positive0 negative

    Customers are satisfied with the responsiveness of the relay. They mention that it's fast, easy to use, and super responsive.

    "Great with Raspberry Pi!This thing is super responsive. It's worth every penny and then some. It's been a great joy working with it...." Read more

    "...o Switches quickly for mechanical deviceo You can supply a separate V+ for relay powerCons:..." Read more

    "...It's perfect for what I needed. Price was excellent & delivery was very fast. Only issue was packaging could have been better...." Read more

    "Fast switching. I mean really fast. Used it with the Arduino. Set it to 10ms. It didn't care. I love the red led indicators...." Read more

    9 customers mention9 positive0 negative

    Customers like the appearance of the relay, mentioning it looks like a nice board. Some say that it's user friendly and very impressive.

    "...These are so awesome, I wish I would have purchased the 16 channel - I will probably end up getting it anyway!" Read more

    "...The board is well made. It is properly designed insofar as the relays default powered off with an open connection and stay off with a 0V connection..." Read more

    "...Very impressive." Read more

    "quality of work looks good, my project for this is ongoing. I hold verdict till I'm done." Read more

    8 customers mention8 positive0 negative

    Customers appreciate the built-in LEDs in the relay. They say they are helpful for testing the inputs and indicating when a relay is operated.

    "...It's been a great joy working with it. And the built-in LEDs (one per input/relay) help test the inputs.How do you use this thing?..." Read more

    "...There is a status LED on each relay. Each relay has three connections: common, normally open, and normally closed...." Read more

    "...The LED indicators are nice to see that it is hooked up correctly, along with the audible click of the relay...." Read more

    "...Used it with the Arduino. Set it to 10ms. It didn't care. I love the red led indicators. Makes it super easy to test...." Read more

    8 customers mention0 positive8 negative

    Customers are dissatisfied with the documentation provided with the relay. They mention that the pins and terminals are labeled clearly, but a complete data sheet is not available.

    "...No documentation supplied; none on the SainSmart site, either...." Read more

    "...The board didn't include any documentation, however I was able to do a quick Google search and find what I needed...." Read more

    "...While there is no documentation, the pins and terminals are labeled clearly...." Read more

    "Documentation is really bad, and I had to search for it...." Read more

    works great but for it to work with Raspberry Pi model ...
    5 Stars
    works great but for it to work with Raspberry Pi model ...
    works great but for it to work with Raspberry Pi model B it requires GPIO signal conditioning as in the attached schematic. the board itself needs to be powered by 5VDC on both sides of the opto-isolator (which kind of defeats it purpose). See schematic.
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    Top reviews from the United States

    Reviewed in the United States on March 28, 2013
    Pattern Name: ModuleVerified Purchase
    8 people found this helpful
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    Reviewed in the United States on July 19, 2012
    Pattern Name: ModuleVerified Purchase
    71 people found this helpful
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    Reviewed in the United States on March 16, 2013
    Pattern Name: ModuleVerified Purchase
    26 people found this helpful
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    Top reviews from other countries

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    Rini Boo
    5.0 out of 5 stars Works on both Raspberry Pi and Pico W without mod
    Reviewed in Canada on March 8, 2023
    Pattern Name: ModuleVerified Purchase
    Customer image
    Rini Boo
    5.0 out of 5 stars Works on both Raspberry Pi and Pico W without mod
    Reviewed in Canada on March 8, 2023
    I have been running the Raspberry Pi 3 with this Sainsmart relay module for 6 years 24/7 home automation on my LAN, there has been zero problem. Recently I want to re-write my code to use MQTT cloud and upgraded to Pico W, then I bought another Sainsmart relay module. I read a lot of articles and YouTube videos saying you have to mod it because both Pi 3 and Pico W GPIO output is 3.3V and the easiest way I learned is to short the Sainsmart onboard LED to get that 1.7V difference. Of coz there are other ways. According to the electronic guys, without any mod, the 3.3V GPIO *may* work but it is not reliable. But I tell you, I am not an electronic guy and I didn't do any mod. My Pi 3 running for 6 years and the relay opens/closes at least 10-15 times a day and I didn't experience any problem or errors.

    For my new Pico W, I just tested it, it's exactly the same as my Pi 3. Without any mod, I connected Pico VBUS (40) to Relay JD-VCC, then VSYS (39) to Relay VCC, Pico Gnd (38) to Relay Gnd, Pico GPIO 16 (21) to Relay IN1.

    I can switch the relay on and off using Python, notice that it's "Low level trigger" meaning the following MicroPython code will turn on with value 0. You can see the photo, I have the relay LED lit up:
    Pin (16, mode=Pin.OUT, value=0)

    Even if you don't take JD-VCC and VCC jumper off and don't connect Pico VBUS (40), it works fine too. I just want the power isolation.
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    SKY1
    5.0 out of 5 stars SWは良好
    Reviewed in Japan on May 7, 2013
    Pattern Name: ModuleVerified Purchase
    One person found this helpful
    Report
    横浜発信
    4.0 out of 5 stars 満足してます
    Reviewed in Japan on April 15, 2018
    Pattern Name: ModuleVerified Purchase
    Carl Chan
    5.0 out of 5 stars Works great with Raspberry Pi
    Reviewed in Canada on June 30, 2013
    Pattern Name: ModuleVerified Purchase
    kazu
    3.0 out of 5 stars ラズベリーパイ でそのまま使えません
    Reviewed in Japan on June 26, 2021
    Pattern Name: ModuleVerified Purchase
    One person found this helpful
    Report