Sale SainSmart 2-Channel Relay Module

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 Details

• Brand: SainSmart
• Model: 2-CH
• Dimensions: .10" h x .69" w x 4.79" l, .10 pounds

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

Customer Reviews

Most helpful customer reviews

23 of 24 people found the following review helpful.
A little finnicky to use
By Craig F
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
}

12 of 12 people found the following review helpful.
Works with 3.3v signals; provide 5v coil power
By Jon Agnew
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.

12 of 12 people found the following review helpful.
Fine relay module
By D. Conner
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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