SunFounderRelay Module Compatible with Arduino and Raspberry Pi 5V DC Trigger by HIGHLO (HIGH Trigger)

the sunfounder relays work really well, whether it's a one relay, two relay, or four relay module. i haven't tried any of the modules with more than four relays. the one relay modules also come in "high" and "low" versions, depending on whether the relay is engaged on a low signal or a high signal. i have had use for both. if you're hunting for relay modules for an arduino or raspberry, start with these.

I am using this on a Raspberry Pi 4 with OctoPrint to control the enclosure heater for a 3D printer. I am using it with the Enclosure Plugin to and temperature monitor. The heater is a 250 W ceramic bulb commonly used in reptile tanks.The JST connector makes this one very handy. do not have to solder wires in nor worry about wires coming loose. The connector makes it easy to disassemble when needed. Other relay modules I have used have header pins or through-holes for soldering.I like that it has blue LED indicator for power and a red LED indicator that lets you know the relay is latched. Makes it very easy to make sure everything is properly connected and working. The ceramic bulb does not give off any light so it is nice to have a visual indicator that power is being supplied.Note the documentation states that this is a 5V relay but it works fine using the 3.3V pin and logic on the Raspberry Pi.

The other most popular and cheaper relay works fine in the circuit. Too late to return.UPDATE - got sent a new one and it works fine. Great customer service! I upgraded to 4 stars, but I would buy again.

Just what I needed to prototype a project. Works perfectly.

Nice compact design, ready and easy to use. Has decent current capacity on output contacts, a nice blue LED to show its powered and a red LED to show contact status. It comes with the connector/wire you need to connect to Arduino/Raspberry Pi, or breadboard easily. Outout contacts are easy to use screw down-clamps. Thumbs up!

It's been in constant use since I received it, and it's been completely reliable. The click from open to shut is quite load, but minor sound proofing (i used a couple-of-millimeters of foam in the case).I'll get this one again.

I bought this to run with a Raspberry Pi. The output voltage of the Pi is 3.3, and it turns out that is too low to trigger the relay. It needs 5V, so I am not able to use it in this project. But, that's my fault not theirs. It's well-made, and when powered with 5 VDC, it runs well.

Nice little relay for Raspberry Pi projects. Used it to power a bubble machine from my raspberry pi. Has a red LED for when it's switched, and a blue one to let you know it's working. Thumbs up!