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4-Channel Relay Board

Arduino Project: Tiny Relay Shield - Starting Electronics
Circuit DiagramComponentsConstructionSoftwareArduino Tiny Stripboard Relay Shield Circuit Diagram - click for a bigger imageThe relay used in the circuit is a 5V relay with part number JRC-23F (JRC-23FHS1DC5V). The bottom view of the wiring diagram for this relay is shown here:Bottom View of the JRC-23F RelaySee more on startingelectronics
DIY Arduino Relay Driver Shield -Use Arduino for Projects
Arduino Relay Driver Shield Circuit Diagram: In this 3-Channel Relay Driver Circuit, we have used an optocoupler to trigger the NPN transistor which further drives the relay. And optocoupler will be triggered by the active LOW signal. Here we have used a 12v 10Amp relay in this PCB board, you can also use 5v relays. Working and Demonstration:
DIY Arduino Relay Driver Shield PCB - Circuit Digest
Arduino Relay Driver Shield Circuit Diagram: In this 3-Channel Relay Driver Circuit, we have used an optocoupler to trigger the NPN transistor which further drives the relay. And optocoupler will be triggered by the active LOW signal. Here we have used a 12v 10Amp relay in this PCB board, you can also use 5v relays. Working and Demonstration:
Arduino Relay Control Tutorial with Code and Circuit Diagram
Below given is Relay Driver Circuit to build your own Relay module: Circuit Diagram and Working: In this Arduino Relay Control Circuit we have used Arduino to control the relay via a BC547 transistor. We have connected transistor base to Arduino pin A0 through a 1k resistor.
Arduino Shield Tutorial – Make Your Own Relay Shield
Figure 2 below shows the circuit diagram of the relay shield. Figure 2: Student Companion Easy Relay 1 Shield Circuit Diagram We could have chosen almost any Digital pin of the Arduino to control the relay, or use some jumpers to allow the user to select a pin of his/her choice, to make things simpler, we’re gonna use pin D7 to control the Arduino.
How to Set Up a 5V Relay on the Arduino - Circuit Basics
Since the Arduino operates at 5V it can’t control these higher voltage devices directly, but you can use a 5V relay to switch the 120-240V current and use the Arduino to control the relay. The Arduino can be programmed to turn on the relay when a certain event occurs, for example when the temperature of a thermistor gets higher than 30° C.
Arduino - Relay | Arduino Tutorial
A relay is a programmable electrical switch, which can be controlled by Arduino or any micro-controller. It is used to programmatically control on/off the devices, which use the high voltage and/or high current.
Guide for Relay Module with Arduino | Random Nerd Tutorials
NO (Normally Open): the normally open configuration works the other way around: the relay is always open, so the circuit is broken unless you send a signal from the Arduino to close the circuit. If you just want to light up a lamp occasionally, it is better to use a normally-open circuit configuration.
A relay accomplishes this by using the 5V outputted from an Arduino pin to energize the electromagnet which in turn closes an internal, physical switch to turn on or off a higher power circuit. The switching contacts of a relay are completely isolated from the coil, and hence from the Arduino.
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