RPi Power Relay Board Expansion Module for Raspberry Pi A+ 3A+ B+ 2B 3B 3B+ 4B

Using this on my raspberry pi venus os project. Installed it tonight and git it programmed. Everything works as it should

I'm an Arduino person and have a few RasPi's laying around and doing other things like OpenSprinkler but I wanted to start doing and playing around with a attic fan controller project. I'm getting into Python and other things and I've only had a few hrs to play with this since it just arrived but I used the demos and code that the Waveshare product has. Since I'm a noob on the RasPi/Linux stuff kinda it took a few more hrs (and that damn GoT finale got in my way!) but I was able to run all the sample codes, on/off tests, etc.The only one that I haven't played with or runs is the WebPioi thing but I think it was built for Pi2 and I'm running it on a 3B+ so I just need a night or a day to play with it.Overall, so far so good from this noobie. My goal is to a have a simple I2C temp sensor up in the attic and then once it hits a target temp, kick in the relay for the attic fan.I'll update later!

The good: Simple to assemble, works without any modification, good use of LEDs to indicate power and function.The bad: The mounting screws come installed and near their torque limit - with the proper screwdriver I stripped one mounting screw just trying to remove it. Using the mounting screws makes it difficult to find cases for the RPi & relay board combined.Overall - very good board for the price and I would buy it again.

this is a great relay switch. i bought one to prototype with and i ended up purchasing a few more for my business. very reliable and sturdy.

I installed this to turn on lighting when a print started and turn it off after printing ended on an Octoprint installation. 24V DC LEDs connected directly to my Prusa I3 MK3S+ through the relay hat work great.

This a nice neat way to add relays to your Pi. I only gave 4 stars because you cannot choose which gpio pins these attach to. If each relay had 2 configurable pins we could stack 2 of these boards for a total of 6 relays. Since relays need a lot of power it would also be nice to have separate 5V input like most other relay boards have. I may end up cutting traces and soldering jumpers to add these features.

I had a set of three relays I'd been using wired up one by one to the PI, but relay signal wires can come loose or unsoldered, and some of the devices I was controlling should never be left on. I ended up having to write scripts that turned off the relay, then checked physically to make sure it was off, then sounded an alarm if it was suck "on", ect.This totally changed the game for me there haha. The pins fit right into the pi's pins, so I don't have to worry about lose connections, and because the relays use 5v from the pi to power themselves, I don't have to run 5v wires or AC/DC 5v convertors to all my devices.I love it!

When my greenhouse hydration sensors start getting thursty, this Raspberry Pi add-on keeps my tomato's and cucumbers happy, healthy and very tasty. From a great seller! Thanks Chris.