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SainSmart 2-Channel Relay Module
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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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This is a 5V 2-Channel Relay interface board. It is able to control various appliances, and other equipment's 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 2-Channel 5V Relay Module.
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From the manufacturer
SainSmart 2-Channel 5V Relay Module
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 (Raspberry Pi, Arduino, 8051, AVR, PIC, DSP, ARM, ARM, MSP430, TTL logic) .
- 5V 2-Channel Relay interface board, and each one needs 15-20mA Driver Current.
- Equiped with high-current relay, AC250V 10A ; DC30V 10A.
- Indication LED’s for Relay output status.
- It activates on low level.
- 1 x SainSmart 2-Channel 5V Relay Module
Top reviews from the United States
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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)
Each relay has a normally open, normally closed, and common connection. With the relay side up, the order is COM, NC, NO.
I desoldered the pin headers and replaced them with jumper wires. I don't think it's really worth the effort; you will save time with a $2 set of female-female jumpers, female-male jumpers (best for direct connection to Arduino), or female-female pin headers. But if you are going to desolder the pins, make sure to 'tin' them first by adding a bit of fresh solder over the existing joints. This makes it easier to melt the existing joints, which have become oxidized. Then, pull off the plastic part of the header with needlenose pliers. Put the relay upside-down in a clamp, and heat a joint with a soldering iron. When the solder flows, push the pin down with the iron. You won't get it all the way through unless you have a very small iron. Use a solder sucker or solder wick to clean up the excess before reapplying the iron and pulling out the pin with pliers.
The Uno can source 5V and enough current to switch the relay from its digital pins, so leave the jumper on.
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.
The Songle relays (SRD 05VDC SL-C) are excellent quality - datasheets are available via a quick search. The load ratings shown on the relay unit are typically for resistive loads. The Songle data sheet also shows the rating for inductive loads (like motors).
The module draws virtually no current until a relay is energized. Each relay coil draws about 70 mA (milliamps) via the VCC power supply pin at 5 VDC. To energize a relay, the associated input pin on the module has to be pulled low by the microprocessor output driving it. Input current to the pin is just 2 mA. (This current has to be sourced by the microprocessor - most digital outputs can easily handle this load. The Arduino Uno, for example, can source up to 40 mA from its digital I/O pins.)
When relay contacts are described as normally open or normally close, that's the status of the contact(s) when the relay is de-energized (no power to its coil). When the proper voltage is applied to the coil, the contacts switch (a normally open contact, for example, closes).
Great quality and usefulness for the money!
Top reviews from other countries
Reviewed in Canada 🇨🇦 on May 2, 2022
I guess there is 4 channel model as well but I wanted a dual channel and it solved my purpose. Very haply with the purchase. The price was also very reasonable compared to the quality and it solved my purpose.
will post some pictures once I finish the install.