Design with 4 channel relay module 5V JD-VCC in Cirkit DesignerThe 4-channel relay module (5V JD-VCC) is a versatile electronic component designed to control high-power devices using low-power control signals from a microcontroller, such as an Arduino or Raspberry Pi. This module features four independent relays, each capable of switching AC or DC loads. The JD-VCC pin allows for the isolation of the relay power supply from the control signal, improving safety and reducing electrical noise.
This circuit consists of a DC-DC converter powering a 6-channel power module, which in turn supplies 5V to a 2-relay module. The power module distributes the converted voltage to the relay module, enabling it to control external devices.
Open Project in Cirkit Designer
This circuit consists of a 5V battery powering a 4-channel relay module, which controls four LEDs (red, yellow, green, and blue) through individual resistors. Each relay channel is activated by a corresponding SPST toggle switch, allowing manual control of the LEDs.
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 microcontroller connected to an 8-channel relay module. The ESP32 controls the relay channels via its GPIO pins, allowing it to switch multiple external devices on and off. The ESP32 also provides power to the relay module.
Open Project in Cirkit DesignerThe module has two sets of pins: control pins and power pins. Additionally, each relay has three output terminals.
| Pin Name | Description |
|---|---|
| IN1 | Control signal for Relay 1 (active LOW) |
| IN2 | Control signal for Relay 2 (active LOW) |
| IN3 | Control signal for Relay 3 (active LOW) |
| IN4 | Control signal for Relay 4 (active LOW) |
| GND | Ground connection for the control circuit |
| VCC | 5V power supply for the control circuit |
| JD-VCC | 5V power supply for the relay coils (isolated from VCC for safety and stability) |
| Jumper Cap | Connects VCC and JD-VCC for shared power supply (remove for separate supplies) |
| Terminal | Description |
|---|---|
| NO (Normally Open) | Open circuit when the relay is inactive; closed when the relay is active |
| COM (Common) | Common terminal for the relay switch |
| NC (Normally Closed) | Closed circuit when the relay is inactive; open when the relay is active |
Powering the Module:
Connecting the Control Signals:
Connecting the Load:
Programming the Microcontroller:
// Example code to control a 4-channel relay module with Arduino UNO
// Ensure the relay module's GND is connected to the Arduino's GND
#define RELAY1 2 // Define pin 2 for Relay 1
#define RELAY2 3 // Define pin 3 for Relay 2
#define RELAY3 4 // Define pin 4 for Relay 3
#define RELAY4 5 // Define pin 5 for Relay 4
void setup() {
// Set relay pins as outputs
pinMode(RELAY1, OUTPUT);
pinMode(RELAY2, OUTPUT);
pinMode(RELAY3, OUTPUT);
pinMode(RELAY4, OUTPUT);
// Initialize all relays to OFF (HIGH state)
digitalWrite(RELAY1, HIGH);
digitalWrite(RELAY2, HIGH);
digitalWrite(RELAY3, HIGH);
digitalWrite(RELAY4, HIGH);
}
void loop() {
// Example: Turn relays ON and OFF sequentially
digitalWrite(RELAY1, LOW); // Turn Relay 1 ON
delay(1000); // Wait for 1 second
digitalWrite(RELAY1, HIGH); // Turn Relay 1 OFF
digitalWrite(RELAY2, LOW); // Turn Relay 2 ON
delay(1000); // Wait for 1 second
digitalWrite(RELAY2, HIGH); // Turn Relay 2 OFF
digitalWrite(RELAY3, LOW); // Turn Relay 3 ON
delay(1000); // Wait for 1 second
digitalWrite(RELAY3, HIGH); // Turn Relay 3 OFF
digitalWrite(RELAY4, LOW); // Turn Relay 4 ON
delay(1000); // Wait for 1 second
digitalWrite(RELAY4, HIGH); // Turn Relay 4 OFF
}
Relays Not Activating:
Electrical Noise or Interference:
Load Not Switching Properly:
Microcontroller Resetting When Relays Activate:
Can I use this module with a 3.3V microcontroller?
What happens if I remove the jumper cap?
Is the module safe for high-power AC loads?