5pcs/lot 5V 1 Channel Relay Module Board Shield Relay Board Ky-019

Working great with Arduino Uno which is controlling an ordinary 24VAC irrigation solenoid.At random intervals, the solenoid sends jets of water into some fruit trees aimed at foil plates hanging in the tree. Best bird scarer ever!

Some other listings for similar Arduino-compatible relays had quite a few reviews complaining about duds, so I took a shot in the dark and purchased this lot which only had 1 review at the time. However, I received a pack of five and after a quick test with some very basic code and a continuity tester, all 5 of these relays functioned just fine.There is a 5v positive, a ground, and a signal pin on the Arduino side, and on the relayed side there is a common, normally closed, and normally opened screw terminal. There's also a small red LED on the board that lights up when the relay is active.

I needed a relay so that I could use a raspberry pi zero w to turn on and off a standard 110v lamp. One of these worked perfect for the job! I tested all of them with a multimeter and they all work. I did accidentally break one of them while I was prototyping by shorting out the bottom of the board-- entirely my mistake-- and I was super happy I had purchased five instead of just one. These are a great value.

I tried using these to run 7.5A of current at 120V. They failed in two weeks. I thought it was a fluke and replaced it with a new module and bang that failed too.The current and voltage ratings on these things are exaggerated to say the least. Buy a power relay instead if you want to switch anything that consumes a decent power.

These worked very with esp32 and esp8266 node mcu.

Just purchased these and 1 was bad. Apply signal and the LED lights up, but resistor wont engage.

I'm sure the others work great, but so far I've had at least one stop working entirely.

all worked great without issue, withstood some moisture without issue.