Design with RELAY SRD-05VDC-SL-C in Cirkit DesignerThe RELAY SRD-05VDC-SL-C is a compact electromagnetic relay designed to operate at 5V DC. It is widely used in electronic circuits for switching applications, enabling the control of high voltage or high current devices using a low voltage signal. This relay features a Single Pole Double Throw (SPDT) configuration, making it versatile for various applications.
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 appears to be a light-activated switch controlling two bulbs using a 5V relay, with an LDR (Light Dependent Resistor) as the sensor. The relay is powered by a 48V to 5V converter, which is switched on by a 12V battery through an SPST toggle switch. The LDR's output is connected to the relay's input, enabling the relay to switch the bulbs on or off based on the ambient light level detected by the LDR.
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 controls two DC motors using a combination of relays, a toggle switch, and capacitive sensors. The XL4015 DC Buck Step-down module provides regulated power, while the capacitive sensors and toggle switch are used to control the relays, which in turn manage the operation of the motors.
Open Project in Cirkit DesignerBelow are the key technical details of the RELAY SRD-05VDC-SL-C:
| Parameter | Value |
|---|---|
| Operating Voltage | 5V DC |
| Coil Resistance | 70 Ω ±10% |
| Switching Voltage | Up to 250V AC / 30V DC |
| Switching Current | Up to 10A |
| Contact Configuration | SPDT (Single Pole Double Throw) |
| Max Power Rating | 1250VA (AC) / 300W (DC) |
| Trigger Current | ~71mA |
| Dimensions | 19mm x 15.5mm x 15mm |
| Weight | ~10g |
The RELAY SRD-05VDC-SL-C has 5 pins, as described in the table below:
| Pin Name | Description |
|---|---|
| Coil+ | Positive terminal of the relay coil (connect to 5V DC) |
| Coil- | Negative terminal of the relay coil (connect to ground) |
| Common (COM) | Common terminal for the relay's switching contacts |
| Normally Open (NO) | Open circuit when the relay is inactive; closed when the relay is activated |
| Normally Closed (NC) | Closed circuit when the relay is inactive; open when the relay is activated |
Coil+ pin to a 5V DC power source and the Coil- pin to ground. This energizes the relay coil when activated.COM and NO pins.COM and NC pins.Below is an example of how to control the RELAY SRD-05VDC-SL-C using an Arduino UNO:
Coil+ pin to a digital output pin on the Arduino (e.g., pin 7) through a transistor.Coil- pin to ground.Coil-, cathode to Coil+).COM and NO pins of the relay.// Define the relay control pin
const int relayPin = 7;
void setup() {
pinMode(relayPin, OUTPUT); // Set the relay pin as an output
digitalWrite(relayPin, LOW); // Ensure the relay is off at startup
}
void loop() {
digitalWrite(relayPin, HIGH); // Activate the relay
delay(1000); // Keep the relay on for 1 second
digitalWrite(relayPin, LOW); // Deactivate the relay
delay(1000); // Keep the relay off for 1 second
}
Relay Not Activating
Load Not Switching
COM, NO, or NC) based on the desired behavior.Microcontroller Resetting
Relay Clicking Noise
Q: Can I use the RELAY SRD-05VDC-SL-C with a 3.3V microcontroller?
A: Yes, but you will need a transistor or relay driver circuit to step up the control signal to 5V and provide sufficient current to the relay coil.
Q: What is the purpose of the flyback diode?
A: The flyback diode protects the control circuit from voltage spikes generated when the relay coil is de-energized.
Q: Can this relay handle AC loads?
A: Yes, the relay can switch AC loads up to 250V with a maximum current of 10A. Ensure the load does not exceed these ratings.