$3.95 – $4.35 (AUD)
Relays are used where it is necessary to control a circuit by a separate low-power signal, or where several circuits must be controlled by one signal.
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Relay modules are handy for controlling external loads. These 5V Optocoupler Isolated Relay Modules allow controlling the actuators consuming the current up to 15 A using the microcontroller’s ports or any commissioning set (including Arduino, Raspberry Pi.) Unlike transistors used for switching, relays use metallic switch contacts, which avoids the power loss and heating inherent in transistor switching circuits. They are also nicely contained little modules that are simple to hook up and are especially useful for switching AC. The main downside to relays is that being an electro-mechanical device, like any mechanical switch, relays are more prone to wear and tear over prolonged use.
Opto-isolators provide complete electrical isolation between the logic control input and the relay power as an added layer of protection in case of a lightning strike or some other kind of significant failure on the AC load of the relay. As shipped, the module has a jumper between header pins JD-VCC and VCC (relay power is jumpered to logic power). This bypasses the optoisolator circuit as it ties the relay power to the logic power, making the device easier to use since just one power supply needs to be connected to the module. If desired to enable an optoisolator, remove the jumper and provide a separate 5V power supply voltage to the JD-VCC and GND pins on that connector.
Note: Maximum contact voltage depends on the type of load
The relays used usually are Songle or Tongling, both of good quality and exact specifications.
Package included: 1 x 5V Optocoupler Isolated Relay Modules
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1 Channel, 2 Channel, 4 Channel, 6 Channel, 8 Chanel
This is a 2 Channel 5V Relay interface board, Be able to control various appliances, and other equipment with a large current. It can be controlled directly by Microcontroller(Arduino, 8051, AVR, PIC, DSP, ARM, ARM, MSP430, TTL logic)
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