Generic 5V 10A 2 Channel Relay Module Shield for Arduino ARM PIC AVR DSP Electronic

Excellent relay, I use it with a Raspberry Pi 3 GPIO and power it with the 3.3v line. Please use Power and Signal from the same source for the relay to work as you expect it to, I use 3.3v since GPIO signals at the same voltage. The relay is activated with a LOW signal, Active Low Relay. Works perfectly fine. I use this to control a 5v DC motor and works really well. Built well. Switches really quickly, stays open as expected. Outside of the Pi, tested to be working fine with 5v, 3.3v.

Does what it says. Using it for past 4 months. Works properly.

It's good product as expected

I thought its only for hobbyBut i used it in my project and it works perfectly

useful for students

Product quality is really good!One thing to note is this is mainly meant for Arduino UNO. You need 5v to trigger this Relay. Arduino gives 5v output which you can connect to IN to trigger the Relay. If you are planning to use this directly with a PIR Sensor (Motion sensor) connecting the PIR 3.3v out to this Relay IN will not work. I hacked this by connecting (soldering from back of the PC board) the PIR out directly to the Emitter leg of the Octocoupler on the Relay board. it worked well. You can also use a transistor (BC547 NPN) where you can apply the 3.3v from PIR and push 5v from source to the Relay IN.

Running this with Raspberry pi zero w. This relay module is active low meaning low(0) turns on the relay. Does the job. I'm working on my gardens automatic drip irrigation with this.

The product is waste and does not work on 3.3V so dont buy itnot worthy for costbelieve me dont buy itit wont work out properly with nodemcubut buy it if u are gonna be using this for arduino