SainSmart 101 70 100 2 Channel Relay Module Review

Great for my little time based projects (latest project, time based doorbell)**NOTE (you don't need to remove the asterisk for this)**This is a Solenoid Relay which means that You need to send HIGH voltage (5V) for OFF and LOW voltage for ON. Make sure the ground is also connected. There was no mention of it, so I'm writing this review for the next person who buys it. A nice *CLICK* to hear the relays working, plus an LED indicator for each relay.

Item received on time. When I plugged it into my projects the power lights came on but the relays didn't work. EDIT: After reading other reviews I found that this relay requires 5V. I used it with a particle photon and applied 3.3V to the input. After following the suggested advice I removed the jumper from the JD-VDC and put 5 In Particle on VIN, he works like a champ. Sorry for the first uninformed review.

Can't beat this for the price, not even sure I could buy a relay for it and certainly my time building it. I like the status LEDs that light up when the relays are active. My only criticism is that the board doesn't have a standard shield size or pins that are compatible with the Arduino shield pinout, and you need male-to-female jumpers to connect it to the Arduino. Also note that the relays turn on at a logical LOW (active low) signal. Otherwise it looks like a well-made two-relay board, with

Yes, it works. This is a dual channel 5V relay capable of switching up to 250VAC at 10A. The only important thing to note is that there is NO high/low trigger select jumper on this board, the Relay only trips when low or grounded. So if you want your code to trigger at a high level, you need to know your code and change it. If you want to trigger high, look for a 5V relay with selectable high/low trigger. This one: https://www.amazon.com/SMAKN%C2%AE-Isolated-Optocoupler-Trigger-Module/dp/B00PXU9…

Unfortunately, both of the devices I bought don't work very well. The relay required at least 5.8V to operate, which was unfortunate as I intended to power it from the RPi's 5V rail. . Adding a secondary voltage regulator just to drive the relay was annoying. Relay #2 on both units also fails, even with an input voltage of 5.8V. The input side of the board works great and has never given me any problems. The status lights for 1 and 2 are reliably turned on and off via the RPi's GPIO. Just a…

I used this to control a lamp and it was very easy. They are a lot smaller than the picture, which was good for me as I needed them to be quite small. The terminal block is still large enough to accept a standard lamp cord. There is a clicking sound when switching on and off. It's not too loud, but you can hear it. Some people will say it's annoying, and I suppose it would be in some applications, but there's something very natural about toggling a lamp with one click. The click of a lamp is a…

As other reviewers have said, this is not a toy. I use together with Arduino in a door alarm. Again, as another reviewer mentioned, the relay contacts must be pulled LOW to turn them on and pulled HIGH to turn them off. This differs from traditional relays. An example sketch that keeps turning them on and off: void setup() { // initialize the digital pin as an output. // pin 10 has relay 1, pin 11 has relay 2: pinMode(10, OUTPUT); pinMode(11, OUTPUT); } void loop() { DigitalWrite(10, LOW)…

This is a small relay board. I hate it when people don't buy from this Revain seller, but you can go on eBay and get it for less than $2 each if you buy a ten unit lot. Your delivery time is of course 4-6 weeks (shipping from overseas). Bought my first unit here at Revain to make sure I can get it working before buying volume on eBay. I used this relay board with the ESP8266 microprocessor. The GPIO on this board can only supply 12mA. I was able to get it working by following these 2 steps: 1…

This compact relay board interfaces easily with 3.3V microcontrollers such as those found on wireless routers and Netduinos with little setup. The relay coils require 5V to switch, in my testing the 3.3V on the relay coils was not enough to switch the relay (but activated the LED). If your project uses a 3.3V microcontroller, you can still get excellent results with this relay. The left set of 3 pins comes with a jumper between JD-VCC and VCC, causing the relay coils to operate from VCC applied