4 pcs DC 5V 1 Channel Relay Module Board Shield High/low Level Trigger with Optocoupler for Arduino

Ils font partie d'un système de domotique

need to add a jumper wire if you want to have both channels controlled by 1 input, but they work well and a bargain for the price - terminals are hard if you don't know to place wire to one side as the screw is in the middle.

I bought this item for my students and they used it in their Arduino circuits. Works very well with no complain at all

I'm using this with two Raspberry Pi boards (one a 3B+, the other a 2B) connecting both the 5V to power the solenoid board and using the PI 3.3V GPIO to turn on/off. One of the 4 units was defective out of the box but the others are working. For the money, they are a good choice. Note that there is a severe limit on the current available for GPIO switching from the Pi, so the single-channel model would be the only viable choice. I am able to use this to power a 3D printer on/off by switching the AC power using the OctoPrint PSU control add-in, which simply raises a configurable GPIO pin.

These are actually quite simple to use after a little digging. The datasheet is terrible but the manufacturer has placed these relays on a breakout board that allows you to use a HIGH or LOW signal to activate the relay. I'm using mine for a class project involving a temperature controller that turns on a fan or heating element depending on the temp. They are rated for up to 250V AC and use an infrared optocoupler to separate the digital control circuit (low voltage) from the analog output (higher voltage). Very happy with my purchase as many Amazon electronic components are very inconsistent in quality and reliability coming when they come from foreign manufacturers. Would recommend.