Raspberry Pi 4-Channel Relay Hat Shield Module 5V DCAC KEYESTUDIO Expansion Board for Raspberry Pi 4/A+/B+/Pi 2 Model B/Pi 3 Model B

works like we want. Thanks

Did exactly what I needed to do, right out of the box. Only too a few minutes to find example Python script to get me started.Two ways it could be improved.1. The screw connectors feel a little flimsy. Im sure they're fine and it wont be a problem, but I was aware they might not be the best.2. This hat only uses 4 GPIO pins, but its not stackable, so if you wanted to use any other of the GPIO pins, you'll need to get the soldering iron out. This is *really* irritating. I want to put and LCD display HAT over the top to display the status, but i cant. Infact I cant do anything with the pins unless i solder the stuff on. Please fit through headers in future.On the whole its a good price, and does what is advertised. Would happily recommend with the caveat in point (2)

Nice and easy to fit relay Hat. I control it via sending terminal commands from a windows pc to change the relay state. My only criticism would be that you cannot stack another Hat on top of this unit as the gpio pins don’t extend for another connection. The relays do make a nice clunk sound so you can tell if they are working.

I bought this to remotely control the power/reset buttons on a couple of PCs. It works great.However I'm alarmed that this is being advertised as "safe" for a 10 amp load at 250v. It clearly is NOT safe for mains use as-is.The actual relays are sufficiently rated, however the wired blocks are connected by tracks on the PCB, and these tracks are also exposed on the underside. These tracks are nowhere near a sufficient gauge to handle a sustained 10 amp load at 250 volts. If you attempt to run 250v/10 amps through this for a sustained period of time then you will almost certainly cause a fire. Also, because the tracks are exposed you run a significant risk of electric shock or arcing at 250v.So again, please, please, do not run mains voltage through this unless you know what you're doing! If you do then ensure that whatever you're switching is also fused at 3 amps (you might get away with 5 amps, but you're pushing it - don't run 10 amps through under any circumstance!). Also cover the tracks underneath with electrical insulating tape. 12-24 volts is completely safe, so don't worry about anything low powered.

We use this for switching a few 230v lighting circuits. Works just fine.

It fits my Raspberry Pi 4B snugly and works as expected. I installed python3-rpi.gpio and it is easy from there on.The 4 relays are on 'pins' 4,22,6,26 in BCM mode and on 7,15,31,37 in BOARD mode. This is not well documented and I needed to do some digging. Am attaching a screenshot of the python program I used to test it - just cycles across them and you'll hear the click and see the led.

Fa il suo lavoro egregiamente

Ich benötige das Relaisboard für Schaltvorgänge im Niedervolt-Bereich (24V) mit einem Raspberry 4 und Python. Mit wenig Suche habe ich im Netz einige Beispielcodes gefunden. Board aufstecken, starten, Code laufen lassen. Funktioniert wie gedacht.Habe ich dann ein weiteres Mal gekauft.

I am posting this review after my initial test since I won't be able to use it for some time. The board works great and easy to setup. I control it with python using code that I created for the Raspberry Pi Gertboard. I think the posted online manual is not accurate in terms of the GPIOs that are used (at least in my case), but that is not a problem. I used my multimeter and figured it out. In case it might help someone, here is what I found:GPIO4 is Relay 1GPIO22 is Relay 2GPIO6 is Relay 3GPIO26 is Relay 4One thing to note is that I couldn't use it with any of my Pi cases. I can only use the base of the case (see the pictures), but that's not an issue.

Utiliser pour la gestion d'une imprimante 3d tout les relais fonctionne et c'est très simple à utiliser.