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SainSmart 8-Channel 5V Solid State Relay Module Board for Arduino Uno Duemilanove MEGA2560 MEGA1280 ARM DSP PIC
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- Enter your model number to make sure this fits.
- Has been assembled, and electrical test passed.
- Led indicator for each relay.
- FR-4 Fiber glass PCB (Double Layer); Size: 155 x 55 x 24 mm (approximately 6.1 x 2.17 x 0.95 inch)
- Input control signal voltage: 0V - 0.5V Low stage (SSR is OFF), 0.5V - 2.5V (unknown state), 2.5V - 20V High state (SSR is ON); SSR Output (each channel); Load voltage range: 75 to 264VAC (50/60Hz); Load current: 0.1 to 2 AMP
- Standard interface that can be controlled directly by microcontroller (Arduino , 8051, AVR, PIC, DSP, ARM, ARM, MSP430, TTL logic)
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- Size (LWH): 5.9 inches, 3.14 inches, 1.57 inches
- Weight: 3.2 ounces
Top Customer Reviews
NOTE: This uses a triac; so it's not going to work for switching on direct current loads. I verified that with a quick test. It works great for AC loads, but is not designed for DC loads. If you need to control DC loads, then you'll want to purchase the mechanical relay board also made by Sainsmart.
A schematic of how each relay is wired is given at the Sainsmart website. Based on that and some measurements I've made, here are some features that aren't obvious from the description.
1. Each relay is protected by a fuse. Granted, the fuse is hard-soldered to the board; so if you blow the fuse, you'll have to de-solder and re-solder a new fuse in place, but that's not a huge problem. Protects each circuit from drawing more than the 2 amps that the relay is rated for.
2. The signal from the Arduino doesn't cut on the relay directly. Instead, the signal from the Arduino turns on a transistor, which closes a circuit that turns on the relay. The relay itself is optocoupled; so there is plenty of electrical isolation between the Arduino board and the relay. No worries at all on my part about frying my Arduino board.
3. Each relay draws about 10 milliamps from the Arduino when switched on. If you're only turning on a few relays at the time, that is not a problem for the Arduino to handle.Read more ›
Part # 0251002.MXL
But, with this Solid State version, it is ACTIVE HIGH, so a reboot or power outage of the Pi does NOT trigger the relay (which is what I want). This is a great relay and I highly recommend it if the specs fit your needs.
Update: Well, it's a few days past Xmas and not a single problem from any of the SSRs. I love that I can program the outlets to turn on and off at less than 25ms (the limit I found for mechanical relays). This allows twinkling effects that I couldn't do with mechanical relays. I'm purchasing another one for a 16 channel setup and adding a San Devices e682 to the mix for RGB LED control as well (my neighbors will REALLY love me next year). I use an Arduino Uno to control the relays however any microntroller with at least 8 digital outputs will work well with this relay board.
These relays are rated for up to 2A - and they mean it. My crock pot was pulling ~2.1A when on, which apparently was enough to cause the relay to fail.
Most Recent Customer Reviews
Got this to control my Christmas lights. Works great I have had this for two years and it is plugged in for a month every holiday. No complaintsPublished 13 days ago by Tony O.
I purchased two of these about three years apart. Relay #3 went bad on both of them. Weird.Published 28 days ago by Amazon Customer
I bought a handful of these from all different vendors and all of them seem to be the same quality and most of them the same components works perfectly
Awesome for Pi... Read more
I was a little disappointed when I found that it's not going to switch my AC load that's stepped down to a lower voltage and converted to DC... Read morePublished 5 months ago by Justin Ploski
This item is great. Built in surge protection and easy to control all pins with an arduino, just make sure you hook up the +5v and ground.Published 5 months ago by James Matthew Demoss