Electronic Components
5V Relay 4 Channel
4 Channel Relay Module This is a 5v, 10A 4-Channel Relay interface board. It can be used to control various appliances, and other equipment with large current. Individual LEDs to indicate which Relays are on. It can be controlled directly with 3.3v or 5v logic signals from a micro-controller or TTL drivers.
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basic Arduino Code for 4 Channel Relay Module
The Arduino LED (connected to pin 13) will flash briefly to indicate Relay 1 is ON, at the same time Relay 1 will turn ON. After a brief interval (aproximatley 1/3 second) the led will flash again, at the same time Relay 2 will turn ON. The same will happen for relays 3 & 4. About 1 second later, all four relays will turn OFF for about 1 second and the cycle will repeat. If you open the Serial Port at 9600 Baud: You will see a text confirmation of when a Relay is ON or OFF You will also see the TX Led flash briefly when the serial lines are sent.
/* BASIC 4 RELAY TIMER *************************************************** * WIRING: * 5v pin on the Arduino to VCC on the relay board * GND pin on the Arduino to GND on the relay board * Pin 4 on the Arduino to IN1 on the relay board * Pin 5 on the Arduino to IN2 on the relay board * Pin 6 on the Arduino to IN3 on the relay board * Pin 7 on the Arduino to IN4 on the relay board *************************************************** * FUNCTION: * The Arduino LED (connected to pin 13) will flash breifly * to indicate Relay 1 is ON, at the same time Relay 1 will turn ON. * After a breif interval (aproximatley 1/3 second) the led will flash again, * At the same time Relay 2 will turn ON. * The same will happen for relays 3 & 4. * * About 1 second later, all four relays will turn OFF * for about 1 second and the cycle will repeat. * * If you open the Serial Port at 9600 Baud: * You will see a text confirmation of when a Relay is ON or OFF * You will also see the TX Led flash breifly when the serial lines are sent. */ // Declare Pins int firstRelay = 4; int secondRelay = 5; int thirdRelay = 6; int fourthRelay = 7; int ledPin = 13; // the setup function runs once when you press reset or power the board void setup() { // Open a Serial port at 9600 Baud Serial.begin(9600); // Initialize digital pins 4, 5, 6, 7, & 13 as outputs. pinMode(firstRelay, OUTPUT); pinMode(secondRelay, OUTPUT); pinMode(thirdRelay, OUTPUT); pinMode(fourthRelay, OUTPUT); pinMode(ledPin, OUTPUT); // Write digital pins 4, 5, 6 & 7 HIGH to hold the relays off. digitalWrite(firstRelay, HIGH); digitalWrite(secondRelay, HIGH); digitalWrite(thirdRelay, HIGH); digitalWrite(fourthRelay, HIGH); } // The loop runs over and over again until the arduino is re-programmed void loop() { digitalWrite(ledPin, HIGH); // The LED is On digitalWrite(firstRelay, LOW); // Relay 1 is On Serial.println("Relay 1 is ON"); delay(350); // Led delay digitalWrite(ledPin, LOW); // The LED is Off delay(350); // Led delay digitalWrite(ledPin, HIGH); // The LED is On digitalWrite(secondRelay, LOW); // Relay 2 is On Serial.println("Relay 2 is ON"); delay(350); // Led delay digitalWrite(ledPin, LOW); // The LED is Off delay(350); // Led delay digitalWrite(ledPin, HIGH); // The LED is On digitalWrite(thirdRelay, LOW); // Relay 3 is On Serial.println("Relay 3 is ON"); delay(350); // Led delay digitalWrite(ledPin, LOW); // The LED is Off delay(350); // Led delay digitalWrite(ledPin, HIGH); // The LED is On digitalWrite(fourthRelay, LOW); // Relay 4 is On Serial.println("Relay 4 is ON"); delay(350); // Led delay digitalWrite(ledPin, LOW); // The LED is Off delay(650); // Relay interval digitalWrite(firstRelay, HIGH); // Relay 1 is Off digitalWrite(secondRelay, HIGH); // Relay 2 is Off digitalWrite(thirdRelay, HIGH); // Relay 3 is Off digitalWrite(fourthRelay, HIGH); // Relay 4 is Off Serial.println("ALL Relays are OFF"); Serial.println(""); // Add an empty line delay(1000); // wait for a second }
intermediate Arduino Code for 4 Channel Relay Module
FUNCTION: The Arduino LED (connected to pin 13) will flash briefly when a Relay is ON. Open the Serial monitor (9600 baud) Type 1 to turn relay 1 ON Type 2 to turn relay 2 ON Type 3 to turn relay 3 ON Type 4 to turn relay 4 ON Type 0 to turn ALL Relays OFF If you open the Serial Port at 9600 Baud: You will see a text confirmation of when a relay is ON / OFF You will also see the TX Led flash briefly when the serial lines are sent.
/* INTERMEDIATE 4 RELAY PROGRAM *************************************************** WIRING: 5v pin on the Arduino to VCC on the relay board GND pin on the Arduino to GND on the relay board Pin 4 on the Arduino to IN1 on the relay board Pin 5 on the Arduino to IN2 on the relay board Pin 6 on the Arduino to IN3 on the relay board Pin 7 on the Arduino to IN4 on the relay board *************************************************** FUNCTION: The Arduino LED (connected to pin 13) will flash briefly when a Relay is ON. Open the Serial monitor (9600 baud) Type 1 to turn relay 1 ON Type 2 to turn relay 2 ON Type 3 to turn relay 3 ON Type 4 to turn relay 4 ON Type 0 to turn ALL Relays OFF You will see a text confirmation of when a relay is ON / OFF You will also see the TX Led flash briefly when the serial lines are sent. */ // Declare Pins int firstRelay = 4; int secondRelay = 5; int thirdRelay = 6; int fourthRelay = 7; int ledPin = 13; void setup() { // Start Serial at 9600 baud Serial.begin(9600); // Set the relayPin as an OUTPUT pinMode(firstRelay, OUTPUT); pinMode(secondRelay, OUTPUT); pinMode(thirdRelay, OUTPUT); pinMode(fourthRelay, OUTPUT); pinMode(ledPin, OUTPUT); // Write digital pins 6 and 7 HIGH to hold the relays off. digitalWrite(firstRelay, HIGH); digitalWrite(secondRelay, HIGH); digitalWrite(thirdRelay, HIGH); digitalWrite(fourthRelay, HIGH); // Acknowledge the program Serial.println("PROGRAM READY"); Serial.println(""); // Print a blank line } // The loop runs over and over again until the arduino is re-programmed void loop() { while (Serial.available()) { char inChar = (char)Serial.read(); if (inChar == '1') { digitalWrite(firstRelay, LOW); // Turn Relay 1 ON digitalWrite(ledPin, HIGH); // The LED is On Serial.println("RELAY 1 is ON"); delay(350); // Led delay digitalWrite(ledPin, LOW); // The LED is Off } else if (inChar == '2') { digitalWrite(secondRelay, LOW); // Turn Relay 2 ON Serial.println("RELAY 2 is ON"); digitalWrite(ledPin, HIGH); // The LED is On Serial.println("RELAY 2 is ON"); delay(350); // Led delay digitalWrite(ledPin, LOW); // The LED is Off } else if (inChar == '3') { digitalWrite(thirdRelay, LOW); // Turn Relay 3 ON Serial.println("RELAY 3 is ON"); digitalWrite(ledPin, HIGH); // The LED is On Serial.println("RELAY 3 is ON"); delay(350); // Led delay digitalWrite(ledPin, LOW); // The LED is Off } else if (inChar == '4') { digitalWrite(fourthRelay, LOW); // Turn Relay 4 ON Serial.println("RELAY 4 is ON"); digitalWrite(ledPin, HIGH); // The LED is On Serial.println("RELAY 4 is ON"); delay(350); // Led delay digitalWrite(ledPin, LOW); // The LED is Off } else if (inChar == '0') { digitalWrite(firstRelay, HIGH); // Turn Relay 1 OFF digitalWrite(secondRelay, HIGH); // Turn Relay 2 OFF digitalWrite(thirdRelay, HIGH); // Turn Relay 3 OFF digitalWrite(fourthRelay, HIGH); // Turn Relay 4 OFF Serial.println("ALL RELAYS OFF"); Serial.println(""); // Print a blank line. } else if (inChar != 1 && inChar != 2 && inChar != 3 && inChar != 4 && inChar != 0) { Serial.println ("Command not recognised"); Serial.println(""); // Print a blank line. } } }
5V Relay 4 Channel
4 CHANNEL RELAY MODULE This relay module is active low. Active Low Low = On / Less than 1 volt at the IN pin will turn the relay ON High = Off / Greater than 3 volts at the IN pin will turn the relay OFF 6 Pins: VCC / GND / IN1 / IN2 / IN3 / IN4 (Connection instructions are in the comments at the top of the example code). This Module can be controlled directly with 3.3V or 5V logic signals from a micro-controller or TTL drivers.
