Since there are two channels on the same board, two separate loads can be powered. The dual-channel relay module can be used to switch mains powered loads from the pins of a microcontroller. When the input is high, the voltage difference across the chain is 0V and no current can flow, but when the input is low, supply voltage appears across the chain and the optocoupler output conducts, supplying current to the base of the drive transistor, turning the relay on. This is because the optocoupler input and the indicator LED are chained to V CC. The second is that the input is active low, meaning that the relay coil is activated only when the input is low. If the jumper is left open, a separate power supply can be provided to the relay coil through the JD-V CC pin. This is selected using the JD-V CC jumper – if the jumper is shorted, then the relay coil and optocoupler output are connected to the signal V CC.
The first is that the optocoupler and relay can have a separate power supply from the input. There are several differences when compared to the single-channel relay module. This same circuit is replicated twice on the module. Internal Circuit Diagram for Dual-Channel Relay Module The input jumper has two input and two power pins and can be easily used to connect to jumper wires and other microcontrollers and sensors. The isolation can be selected using the V CC/JDV CC jumper. The optocouplers are used to provide additional isolation between the input and the relays. The status LEDs turn on when the relay is active and indicate switching. The freewheeling diodes prevent voltage spikes across the switching transistors. The switching transistors amplify the signal from the inputs enough to drive the relay. As marked on the body of the relay, the relay coil is rated for 5VDC, and the contacts are rated for 10A at 250VAC or 30VDC, or 125VAC or 28VDC. On the left are two terminal blocks, which are used to connect mains wires to the module without soldering. The dual-channel relay module contains switching relays and the associated drive circuitry to make it easy to integrate relays into a project powered by a microcontroller. Understanding 5V Dual-Channel Relay Module The following are the major components that would find on a Dual channel Relay module, we will discuss them in detail further in this article.ĥV Relay, Optocoupler, Diodes, Transistors, Resistors, LEDs, Male Headers, 3-pin Terminal connectors, etc. Single-channel relay module, four-channel relay module, eight-channel relay module.Ĭomponents present on a 5V Dual Channel Relay Module Relay maximum contact voltage – 250VAC, 30VDC.
Current when relay is active - ~70mA (single), ~140mA (both).V CC to power the optocouplers, coil drivers, and associated circuitry Input for directly powering the relay coils Input for isolated power supply for relay coils Here to turn on the Relay with Arduino we just need to make that Arduino Pin High (A0 in our case) where Relay module is connected.The dual-channel relay module is more or less the same as a single-channel relay module, but with some extra features like optical isolation.
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A Relay module is easily available in the market with all its Driver circuit on the board or you can create it on perf board or PCB like below. Every Inductor coil produces equal and opposite EMF when switched OFF suddenly, this may cause permanent damage to components, so Diode must be used to prevent reverse current. And Diode is used to prevent reverse current flow, when the transistor is switched OFF. The resistor is used to provide biasing to the transistor.
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Transistor is used to amplify the current so that full current (from the DC source – 9v battery) can flow through a coil to fully energies it. The relay is always configured by using a small Driver circuit which consists a Transistor, Diode and a resistor. Relays are available in many ratings, here we used 6V operating voltage relay, which allows 7A-250VAC current to flow. When there is some voltage applied to the coil, the electromagnetic field produced, which attracts the Armature (lever connected to spring), and COM and NO (normally open contact) gets connected, which allow a larger current to flow. When there is no voltage applied to the coil, COM (common) is connected to NC (normally closed contact). Commonly used Relay is Single Pole Double Throw (SPDT) Relay, it has five terminals as below: A relay is a good example of controlling the AC (alternate current) devices, using a much smaller DC current. Means by applying small current we can switch ON the relay which allows much larger current to flow. Relay is an electromagnetic switch, which is controlled by small current, and used to switch ON and OFF relatively much larger current.
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