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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, 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
Top customer reviews
I used this relay board with an ESP8266 microprocessor. The GPIO on this board are only capable of sourcing 12 mA. I was able to get it to work by the following two steps:
1. Follow the instructions provided by John Agnew (i.e. remove the jumper across JD-VCC and VCC and provide independent 5V power to the relay board)
2. I also soldered in a (wire) jumper across the LED on the relay board. This lowers the GPIO current requirement. You lose the visual (LED light) that indicates that the relay is switched but the audible click (and verifying with a multimeter on the relay output) is all you need to do.
It arrived on time, works as advertised (well, as others have documented), and costs less than a fancy coffee drink. I have no qualms whatsoever recommending it to anyone who is undaunted by the lack of included documentation.
EDIT: After reading other reviews I realized that this relay requires 5V. I was using it with a Particle Photon and was supplying the input 3.3V. After I followed the suggestions provided and pulled the jumper from the JD-VDC and supplied 5V from the Particle from the VIN, it works like a champ.
Sorry for the initial uninformed review.
**NOTE (does not need a star removed for it)**
This is an electromagnetic relay, meaning that you have to send it HIGH voltage (5v) for OFF, LOW voltage for ON.
Make sure to run your ground as well.
No directions came with it, which i'm writing this review for the next person that buys it.
A nice *CLICK* to hear the relay working as well as a LED light for each relay.
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)