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Do you want to control a standard wall outlet device with your microcontroller, but don’t want to mess with the high-voltage wiring? The IoT Power Relay is a controllable power relay equipped with four outputs that help you create an Internet of Things project with safe, reliable power control. With the IoT Power Relay you can easily control the power going to a device with an Arduino, Raspberry Pi or other single-board computer or microcontroller. It provides an alternative to the Power Switch Tail.
The IoT Power Relay is designed to allow you to safely control an outlet device that operates at 3--48VDC or 12--120VAC. Each IoT Power Relay features a single input (from the included C13 power cable) to four outputs: one normally on, one always on, and two normally off. The durable SPDT control relay is rated at 30/40A, for 400,000 operations.
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There is an "always ON" outlet that could be used to provide power to your power supply and microcontroller/single board computer if you did not want to connect it to a wall outlet.
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To connect wires securely to the control pins of the IoT relay, you need to remove the green screw terminal from the socket. Grab the sides of the green screw terminal with your index finger and thumb. Gently wiggle the screw terminal out of the socket. Using a flat head screw driver [ like the SparkFun Mini Screwdriver, the screws can be adjusted to secure the wires in the screw terminals. The screw terminal can be inserted back into the socket when complete.
If it requires power, you need to know how much, what all the pins do, and how to hook it up. You may need to reference datasheets, schematics, and know the ins and outs of electronics.
Skill Level: Rookie - You may be required to know a bit more about the component, such as orientation, or how to hook it up, in addition to power requirements. You will need to understand polarized components.
See all skill levels
Based on 13 ratings:
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Solid product except for the screws that hold the wires in the green terminal blocks are inaccessible without disassembling the device. Not what I expected, but functionally works just fine. Hard to beat what this does at the price point, but I had to take apart the device and the picture also looks like that is the case.
Thank you for the review.
I wanted to let you know that you don't need to disassemble the IOT Relay to use the screw terminals though. The part that you attach your wires to actually unplugs from the rest of the IOT Relay and exposes the screws that tighten down on the wires. Just pop out the green connector, attach your wires and plug it back in and you're in business.
For the money, this is by far the most cost effective solution for turning on an amp from a preamp 12V system turn-on signal. I'll be surprised if I can get 400,000 operations out of it, but at this price, I don't care. I can't build it myself for less. So far it works flawlessly.
This is a nice, compact package that lets you turn 120VAC devices on and off with a low power signal. Yes, you could build it yourself, but this is very nice, ready to go, and probably doesn't cost much more than the price of the parts. If needed, you can swap the included power cord (standard computer-type receptacle/plug) for a longer one. There are 2 normally off receptacles, 1 normally on, and 1 always on. I'm using it with a 5VDC signal, but it can handle a very large range of AC or DC voltage. Definitely way better than making my own. I'll probably buy a couple more of these.
I'm using this to control the power to a light and 3D printer from a Raspberry PI running OctoPI and the standard PSU Control plugin. The PI is always on and one GPIO is used to switch the relay. I feel much more comfortable doing simple wiring at 3.3v DC vs 110v AC. The only thing I MIGHT change would be to allow (via switch or jumper) each outlet to be defined as always on, normally on or normally off.
At first it was kind of unorthodox for me to use but it is really neat and handy.
Works perfectly with 3.3 or 5 VDC input. In our test, we alarmed our neighbors by flashing S-O-S repeatedly.. Our real application is to use the relay to simulate our normal lighting patterns when we are away.
You can power your project with the always on and control the switched one with a pin. My son's first project was to use it with the IR Thermometer Evaluation Board - MLX90614 to build a thermostat for my sons fan. Works great!
Not used yet
I was worried there might be extra complexity in wiring it up, but no. One lead to GND and the other to any old GPIO pin and I was up and running! The only negative I wasn't expecting is the relay inside has quite a loud click when switching. But it's not a big deal at all, and likely partially due to the fact that it's toggling (I think) three separate relays simultaneously inside.
A/C power switching by a microprocessor or a remote low-current switch is made very convenient and safe by this neat unit.
This is a very simple to use device and it has many uses.
I'm using this to PWM power to my solder re-flow (toaster) oven and it's working great. I'm sure I'll think of many other useful applications for it in the future
A power cable adapter a couple feet longer would have been nice, and it is a bit on the noisy side if you are switching frequently.