Design with Relay 3 Channel Optocoupler in Cirkit DesignerThe Relay 3 Channel Optocoupler module, manufactured by Arduino (Part ID: Relay), is a versatile electronic component designed to control high-voltage devices using low-voltage signals. This module features three independent relays, each capable of switching AC or DC loads, and is equipped with optocouplers for electrical isolation. The optocouplers ensure safe operation by isolating the control circuit from the high-voltage load.
This circuit uses optocouplers paired with 220-ohm resistors to interface an Arduino Nano with an external device via a 5-pin relimate connector, providing electrical isolation and signal transfer while protecting the microcontroller. The Arduino's digital I/O pins are connected to the optocouplers, but the control logic is not yet defined in the provided code.
Open Project in Cirkit Designer
This circuit features an ESP32 microcontroller connected to an 8-channel relay module. The ESP32 controls the relay channels via its GPIO pins, allowing for the switching of external devices or loads through the relays.
Open Project in Cirkit Designer
This circuit features an ESP32-POE-ISO microcontroller connected to a 4-channel 30A 5V relay module. The ESP32 controls the relay channels via its GPIO pins, allowing for the switching of high-power devices through the relay module.
Open Project in Cirkit Designer
This circuit features an ESP32-S3 microcontroller interfaced with a KY-019 Relay module, a VL53L1X time-of-flight sensor, and a W5500 Ethernet module. The ESP32-S3 controls the relay and communicates with the VL53L1X sensor via I2C, as well as with the network through the Ethernet module. An AC source is converted to DC for powering the components, and a micro USB connection is used to trigger the relay.
Open Project in Cirkit Designer| Pin Name | Description |
|---|---|
| VCC | Connect to 5V power supply |
| GND | Ground connection |
| IN1 | Control signal for Relay 1 (active LOW) |
| IN2 | Control signal for Relay 2 (active LOW) |
| IN3 | Control signal for Relay 3 (active LOW) |
| Pin Name | Description |
|---|---|
| COM1 | Common terminal for Relay 1 |
| NO1 | Normally Open terminal for Relay 1 |
| NC1 | Normally Closed terminal for Relay 1 |
| COM2 | Common terminal for Relay 2 |
| NO2 | Normally Open terminal for Relay 2 |
| NC2 | Normally Closed terminal for Relay 2 |
| COM3 | Common terminal for Relay 3 |
| NO3 | Normally Open terminal for Relay 3 |
| NC3 | Normally Closed terminal for Relay 3 |
// Example code to control a 3-channel relay module with Arduino UNO
// Ensure the relay module is connected to pins 7, 8, and 9 on the Arduino
#define RELAY1 7 // Define pin for Relay 1
#define RELAY2 8 // Define pin for Relay 2
#define RELAY3 9 // Define pin for Relay 3
void setup() {
// Set relay pins as outputs
pinMode(RELAY1, OUTPUT);
pinMode(RELAY2, OUTPUT);
pinMode(RELAY3, OUTPUT);
// Initialize all relays to OFF state (HIGH signal)
digitalWrite(RELAY1, HIGH);
digitalWrite(RELAY2, HIGH);
digitalWrite(RELAY3, HIGH);
}
void loop() {
// Example sequence to toggle relays
digitalWrite(RELAY1, LOW); // Turn ON Relay 1
delay(1000); // Wait for 1 second
digitalWrite(RELAY1, HIGH); // Turn OFF Relay 1
digitalWrite(RELAY2, LOW); // Turn ON Relay 2
delay(1000); // Wait for 1 second
digitalWrite(RELAY2, HIGH); // Turn OFF Relay 2
digitalWrite(RELAY3, LOW); // Turn ON Relay 3
delay(1000); // Wait for 1 second
digitalWrite(RELAY3, HIGH); // Turn OFF Relay 3
}
Relays Not Activating:
Load Not Switching:
Interference or Noise in the Circuit:
By following this documentation, users can safely and effectively integrate the Relay 3 Channel Optocoupler module into their projects.