8-Channel 12V Relay Module for Arduino (Works with Official Arduino Boards)

Pros: Very versatile relay board with isolated relay driver/buffer. Works with digital output voltages from 1.6V to over 12V. Ability to separate 12V (for relay driver) ground from your sensitive digital ground, eliminating noisy ground problems. 10A resistive AC load switching. 3A inductive AC load switching. 12VDC power indicator LED and individual coil LEDs are a good feature for fault-finding. Excellent value. I wouldn't be able to find the components for this price.

Cons: Datasheet for the relay didn't mention anything about capacitive load break ability. This is of interest when switching flouro or energy saver light loads, as I intend to do. It should be good for 1A or so. Bolt holes are a bit too close to the switching terminals. Use plastic stand-offs for mounting instead of screws/bolts.

Other: Bargain!

Pros: Very easy to understand use. 5v circuit includes current limiting resistors, so you can run this directly from a microprocessor. 12V relay coil circuit includes "flyback" diodes for suppression of back EMF spikes. Well built.

Cons: No circuit diagram, connection diagram or similar provided, which may cause problems for beginners.

Other: Be careful that you understand the required circuit to run the relays. You need to SOURCE +5V onto an input pin to run that relay and COM is your 0V. You do NOT put +5V on the common and SINK the inputs to ground.

Pros: perfectly. 12volt relay are powered and controlled from the Arduino. You need to set PINs for voltage supply. If you remove the jumper between COM and GND, then COM apartment with Arduino IN1 - IN8 for relay control and GND connections with external power supply + 12 volt VCC for switching relay.

Cons: Relays ares 12volts, but well Arduino does not have enough current amps for switching. LEDs are too brightness.

Other: beware of high voltage 230Volt if you use for your project!! The device is not in isolation!

Pros: The price is good and the module reliably does what it's supposed to. The circuit that powers relays is galvanically separated from the input pins via optocouplers. Very easy to use with any microcontroller.

Cons: None.

Other: If you need to control several 230V powered devices with a microcontroller, buy this.

Pros: Easy to use, the connections it is very simple, works great, has a very good price for the amount of relays that have, quality is also very good, i will buy more. Very compact board with 8 leds, it indicate if the relay is active or not.

Cons: Nothing bad to report, so far I am delighted with the product.

Other: Could exist more than 8 relays with the same voltage, only find 1,2,4 and 8 relays. If have 16 relays i buy more.

Pros: Relays are preety good quality and repsonse time for this module is very small. It is great for most of all applications for Arduino. I used for Arduino UNO and it works great. I used to do most of task like turn on heavy motors 110V drawing more current, it works great.

Cons: It need separate power supply. If you want to reduce power supply connection, use 5V relays module, which you can power from Arduino itself. I am using since last couple of months in my laboratory and it can handle good current.

Other: Bottom line, it works great with any Arduino. Only external 12V power is require.

Pros: Good quality PCB carries 8 relays, the contact tracks are thick to carry 10 Amps without burn. The relays are driven by optocouplers so to have good insulation between the logical unit from power unit. A jumper permits to bypass the optocoupler and have the same common line between the input drive and the relay solenoid. The board has 1 power indicator LED and 1 LED for each relay.

Cons: The board needs a 12 Vcc for the relays but has a TTL (5 Vcc) input for driving, there is therefore need two power supplies, one for the Arduino board and a 12v for the relay.

Other: if you use the board with 220 Vca put an insulation shield under the board.