SunFounder 2 Channel DC 5V Relay Module with Optocoupler Low Level Trigger Expansion Board Compatible with Arduino R3 MEGA 2560 1280 DSP ARM PIC AVR STM32 Raspberry Pi

I purchased this SunFounder 2-channel 5V relay module for a small electronics project, and it works exactly as advertised. The board is well built, clearly labeled, and easy to integrate with a microcontroller (Arduino/ESP-based setup). The optocoupler isolation is a nice safety feature and gives extra confidence when switching external loads. Both relays trigger cleanly at 5V, and I’ve had no issues with false switching or noise. Screw terminals are solid and make wiring straightforward. Overall, this is a reliable and beginner-friendly relay module that’s great for automation, DIY projects, or learning electronics. Good quality for the price — I would definitely buy it again.

The relay works very well with Arduino. Simple wiring and the relay is operating properly.

SunFounder 5V Relay Shield Module for Arduino UNO 2560 1280 ARM PIC AVR STM32 (4Channel) I am extremely happy with this board. It works flawlessly with the Arduino. It is responsive and VERY easy to use. Remember though, that its logic is Active Low, so when power is first applied from the Arduino, the low state of the pins causes the relay to turn on until the Arduino has time to set them to active high, thereby turning them off. I solved this problem using a 2N2222 transistor and a 1k Ohm resistor between an Arduino pin and the 5 volt input to the relay. Now, when the Arduino powers on, there is NO power to the relay board UNTIL the program tells it to do so. GREAT PRODUCT - HIGHLY RECOMMENDED!

Works perfectly with Arduino Uno

I bought these to handle more voltage and current than the standard I/O pins on a Arduio were capable of and to get the double throw capability. Each Relay on this unit is a single pole double throw relay. Each relay is separately controlled by a 5v digital signal. The biggest issue with this unit is the documentation that is provided, none. They are not that hard to figure out, but some specs on current draw and switching capability would be nice. The board can also use external power supplies to power the relays. This is necessary if you want to drive more than about 4 of the relays at the same time with an Arduino. BUT the external power supply is 5v. So if your project runs off a 9 or 12v battery, you need a separate external regulator to provide 5v for the relays. If I was going to design this from scratch, I'd make it I2C or SPI so you don't chew up so many pins to use it. But it does the job.

This is a good relay board, easy to use and does precisely what I wanted it to do. Wired it to an Arduino that I had assigned relay controls to the relevant pins, was able to correctly control all 4 relays as desired. I misinterpreted the drawings at first and thought that if the three contacts on each relay are A/B/C, that A/B were connected with no power, and A/C were connected when the relay was powered. Well it turns out I'm a dork, A/B are connected with no power and B/C are connected when the relay is powered. Once I figured that out, making everything work was super simple. Small bank of LED indicates when each of the 4 relays is powered, since you can hear the clicking but it's nice to have visual feedback about which relay/s made the noise. Good relay shield.

If you are truly looking to decouple and isolate the device controlling the relay (such as an Arduino, etc) from the relay coils to provide true optoisolation, you must connect it in the following way: Remove the jumper from the JDVCC pin, connect power from a separate 5v power supply to the JDVCC pin and ground from the separate 5v power supply to either of the Gnd pins. Next connect the 5v pin from your controlling device (arduino) to the VCC pin on the 10-pin header of the module, and connect your I/O pins from the Arduino to the 8 control pins. The opto-isolator will get the 5v signal from the Arduino, and the Ground from the Arduino when you perform a digital write LOW on the I/O pin, completing the circuit, and that control circuit is completely isolated from the relay coil power circuit. The gotcha with this board is that the Gnd pin on the 10-pin header and the Gnd pin on the JDVCC/VCC/GND header are actually connected on this board. This means if you connect your Arduino Gnd to either of the Gnd pins on the board, you have now tied your Arduino to the separate 5vdc power supply (which you might not want to do). With all 8 relay coils activated, the board draws 472mA of power - about 50-55mA per relay.

resultó muy práctico y funcionó correctamente desde el primer uso. Es una solución sencilla y confiable para proteger y estabilizar mis proyectos con Arduino.

Este Shield es de muy buena calidad y además facilísmo de utilizar: Conectas Vcc y GND y luego las salidad de tu arduino(u otro microcontrolador) a las cuatro entradas disponibles. Cabe destacar como otros muchos usuarios, que la lógica es invertida; es decir, cuando la salida del arduino es HIGH, el relé esta apagado y viceversa.

Llegada en el tiempo estimado. Producto nuevo , todo correcto.

These have worked perfectly with a rasberry pi to make a garage door controller

I am using these relays to control LED strip lighting. The controller operates on 5VDC and the lights require 12VDC. These relays provide a perfect solution. The optocouplers provide an added level of isolation. The relay coils operate on low current 5VDC. The output contacts can handle high current loads of different voltages. There is a set of NO and NC contacts for each relay. Each relay is operated independently. I recommend this product for anyone that requires isolation between the controlling circuit and the output load.

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