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SainSmart 2-Channel Relay Module

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List Price: $12.00
Price: $6.19 & FREE Shipping on orders over $35. Details
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  • 5V 2-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, MSP430, TTL logic)
  • Indication LED's for Relay output status
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$6.19 & FREE Shipping on orders over $35. Details In Stock. Ships from and sold by Amazon.com. Gift-wrap available.

Frequently Bought Together

SainSmart 2-Channel Relay Module + SainSmart UNO R3 ATmega328P Development Board + USB Cable Compatible With Arduino UNO R3 Mega 2560 Nano Robot + Vktech 5pcs DS18b20 Waterproof Temperature Sensors Temperature Transmitter
Price for all three: $31.39

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Product Description

This is a 5V 2-Channel Relay interface board, Be able to control various appliances, and other equipments with large current. It can be controlled directly by Micro-controller (Arduino , 8051, AVR, PIC, DSP, ARM, ARM, MSP430, TTL logic. Features; 5V 2-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, MSP430, TTL logic); Indication LED's for Relay output status Package Content1x SainSmart 2-Channel 5V Relay Module

Product Information

Technical Details
Item Weight1.6 ounces
Product Dimensions4.8 x 0.7 x 0.1 inches
Item model number2-CH
  
Additional Information
ASINB0057OC6D8
Best Sellers Rank #2,217 in Electronics (See top 100)
Shipping Weight1.6 ounces (View shipping rates and policies)
ShippingCurrently, item can be shipped only within the U.S.
Date First AvailableJune 23, 2011
  
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Customer Questions & Answers

Customer Reviews

Works well and was easy to use.
M. Holt
I was able to control this relay board with the GPIO pins on a TP-LINK MR3020 router without burning out the SoC, supplying the 5v coil power from the USB input.
Jon Agnew
The Songle relays (SRD 05VDC SL-C) are excellent quality - datasheets are available via a quick search.
David P

Most Helpful Customer Reviews

34 of 35 people found the following review helpful By Craig F on February 14, 2012
Verified Purchase
As other reviewers said, it is not a toy. I use is along with a Arduino in a door alarm. Again, as previously stated by another reviewer, the relay pins need to be pulled LOW in order to turn them on and pull them HIGH to shut them off. This is contrary to normal relays.
An example sketch that cycles them on and off over and over:
void setup() {
// initialize the digital pin as an output.
// Pin 10 has relay 1, pin 11 is relay 2:
pinMode(10, OUTPUT);
pinMode(11, OUTPUT);
}

void loop() {
digitalWrite(10, LOW); // set the relay 1 on
delay(1000); // wait for a second
digitalWrite(10, HIGH); // set the relay 1 off
delay(2000); // wait for 2 secs
digitalWrite(11, LOW); // set the relay 2 on
delay(1000); // wait for a second
digitalWrite(11, HIGH); // set the relay 2 off
delay(2000); // wait for 2 secs
}
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26 of 26 people found the following review helpful By Jon Agnew on February 17, 2013
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This compact relay board is easy to interface to 3.3v microcontrollers, like those on wireless routers and Netduinos, with a little setup.
The relay coils require 5v to switch, in my testing 3.3v on relay coils was not enough to switch the relay (but did activate the indicator LED.)
If your project uses a 3.3v microcontroller, you can still get great results from this relay. The left set of 3 pins come with a jumper across JD-VCC and VCC, causing the relay coils to operate from the VCC supplied on the switching side pin header.
To use the relay board with a 3.3v micro, remove this jumper and save/discard it, connect GND to common power supply negative, supply 5v for relay coils on the pin labeled JD-VCC, and supply 3.3v on either pin labeled VCC. Your 3.3v micro connects to IN1 and IN2, and because of the transistors on the relay board will only switch 3.3v at a low current (about 20 mA.)
As other reviewers have noted, IN1 and IN2 must be pulled LOW to switch the relays. This works out well; micros can generally sink more current than they can source. I was able to control this relay board with the GPIO pins on a TP-LINK MR3020 router without burning out the SoC, supplying the 5v coil power from the USB input. Overall, this relay board is a great low-cost solution for enabling Internet control of just about anything.
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17 of 19 people found the following review helpful By D. Conner on August 2, 2012
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This relay works well as most reviewers have already commented. One complaint of most reviewers is that the relay is driven to the on state by a low signal, not a high signal as they think makes more sense. In the electronic world it is standard to drive things to their energized state by a low signal, as logic can normally sink much higher current driving low than it can source driving high. Furthermore this makes the product compliant with 3V logic. In any case the relay provides both normally-open or normally-closed connections so you can design your circuit to default to the desired state if the drive supply fails. In short, this circuit behaves as it should.
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11 of 12 people found the following review helpful By J. Donagher on October 4, 2011
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but it is a nice, cheap relay. You can use it to control low voltage or line voltage (i.e. switch a power outlet on and off) from an Arduino. I'm using mine with an Arduino to convert a chest freezer into a kegerator by overriding the internal thermostat of the freezer.

The connections to your Arduino (or whatever) are:
VCC - supply voltage. 5V from my Arduino.
IN1 - set to HIGH to set the relay to its "default" state, set to LOW to switch the relay to its alternate state
IN2 - same as IN1, but controls the second relay on the board
GND - ground

A few random notes:
- I really appreciate the indicator lights on this board! (power, relay1 on/off, relay2 on/off)
- this relay is mechanical and makes a very audible CLACK when it switches state. Keep that in mind depending on your application!
- I unsoldered the connection pins and replaced them with wires - if you don't want to do that you'll need some sort of coupler. I'm new to hobby electronics so I'm probably missing some terminology .. essentially the connections to control this relay are in the form of pins (male) on this board, while it has screw-in terminals for the high voltage input/outputs. I unsoldered the pins from this board and replaced with wires, and it works fine.
This was a pain, so had I known I needed to do this before this arrived, I would have looked for a female/female coupler (again, sorry if I'm missing the right terminology)
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3 of 3 people found the following review helpful By Brian on May 6, 2013
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This is awesome. It switches very fast at a rate of about 30Hz or faster. It also handles a large current well. Have been using it as a way of switching my solar panels from my grid tie inverter to a battery bank. It gets a little warm at pushing 8-9 amps at 14v but it works well.
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1 of 1 people found the following review helpful By Amazon Customer on September 17, 2014
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Setup:

You supply power (+5 vdc) and ground. Total power consumption of the board is unspecified. At the inputs, signal low energizes the relays.

Pros:

o Works as advertised.
o Connections to the relays are robust screw terminals.
o Switches quickly for mechanical device

Cons:

The connections to the control hardware -- input signals and power/ground -- are nasty little push-on pins, for which no connector is supplied, and to which soldering is difficult. Nor are there through-holes in the board for permanent and secure wiring. Unless you de-solder the connector (which is not a bad idea, if you have the skills.)

Mounting holes are too close to the relay connections.

No documentation supplied; none on the SainSmart site, either. Missing information includes power consumption, drive current and voltage, switching rates, induced power supply noise from inductive kick, suppression of relay inductive kick (I think this is in place... looks like there are two diodes on the board, marked as D1 and D2.)

Caveats:

Just be aware that unless you happen to have a four conductor cable with a four-pin connector around, or 3-4 male-to-female jumpers, you're either going to be ordering more stuff, or trying to make the silly pins functional by hacking them.

Suggestions:

This would have been much better if there were screw terminals on the control side, as well as the relay side.
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SainSmart 2-Channel Relay Module
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