🔌 SunFounder 4 Channel 5V Relay Shield Module: Compatible with Arduino R3 MEGA 2560 1280 DSP ARM PIC AVR STM32 Raspberry Pi Review

Although this product is well designed (as far as I can tell from the diagram on the manufacturer's website and the physical execution of the design, it looks solid). It's wrong to say that this can be driven from the microcontroller's standard logic level outputs. This requires an output capable of sinking 15mA of current when active. it is not a standard "logical level". That's not to say the rest is bad, it actually has opto-isolation between the logic-level interface and the actual relay…

4 stars for: no documentation, overall OK build quality and good price. Would buy again. A good product for quick use to turn on/off a simple load with a PIC microcontroller. Note that a 0V/GND signal on any input on the relay board will energize/activate the relay, while a 5V signal will de-energize the relay. The relays are listed for 30VDC / 125-250VAC, both 10A, but I've never been familiar with tiny screw terminals of this magnitude. The board has a set of "VCC/GND" jumpers. I believe this

In my opinion it has one fatal error that most would consider similar. You would think that if you send 5V to a relay it would turn the relay on, but the opposite is true. Applying 5V to the relay opens it, otherwise it closes. So if you want to turn something on for the hour/day, you have to turn on the relay for 23 hours if you don't want to turn it on. Using this with a solar application means you are draining the battery at night when there is no sun as you have to send 5V to keep the relay

This module is perfect! It is soldered and has screw terminals. Like almost all relays of this type, it cannot handle more than 10 A. In the rest of the world this will not be a problem since 230 V circuit breakers work with 10 A. However, in North America with 15A and 20A circuits, this will not work. This limits you to devices with 1200W or less. My first project with him was a plant watering system. The pump only requires 4-12 volts and probably a few hundred milliamps. BTW if you want to…