KY-019 5V Relais
This module is a 5V relay for switching higher currents.

This module is a 5 V relay for switching higher currents. The relay switches the higher voltage when 5 V are applied to the voltage input of the switch.
The output header of the relay has two output terminals:
-
What is marked "NC" for "normally closed" in the figure below means that this passage is shorted by default without electrical switching at the relay.
-
What is marked "NO" for "normally open" in the figure below means that this passage is open or disconnected by default without electrical switching at the relay.

Technical data
Voltage range (AC) | 0 V - 240 V AC at 10 A |
Voltage range (DC) | 0 V - 28 V DC at 10 A |
Required switching current | ca. 15 - 20 mA |
Relay type | Changeover switch |
Dimensions | 53 x 18 x 20 mm |
Pin assignment
Warning
**Working with voltages higher than 30 V and especially with mains voltage (230 V) can cause physical damage and even be fatal.
We advise that work with higher voltages should only be carried out with the appropriate professional competence.**
Code example Arduino
Pin assignment Arduino
Arduino | Sensor |
---|---|
Pin 10 | signal |
5 V | +V |
ground | GND |
The program simulates a flashing light - it switches the relay between the two states (or output terminals) in predefined time (delayTime).
int relay = 10; // Declares the pin to which the relay is connected
int delayTime = 1; // Value in seconds how long to wait between the switchovers
void setup ()
{
pinMode (relay, OUTPUT); // The pin is declared as output
}
// The program simulates a blinker - it switches the relay in predefined
// time (delayTime) between the two states (or output terminals).
void loop ()
{
digitalWrite (relay, HIGH); // "NO" is now shorted;
delay (delayTime * 1000);
digitalWrite (relay, LOW); // "NC" is now shorted;
delay (delayTime * 1000);
}
Example program download
Code example Raspberry Pi
Pin assignment Raspberry Pi
Raspberry Pi | Sensor |
---|---|
GPIO 24 [Pin 18] | Signal |
5 V [Pin 2] | +V |
Ground [Pin 6] | GND |
The program simulates a flashing light - it switches the relay between the two states (or output terminals) in predefined time (delayTime).
# Required modules are imported and set up
import RPi.GPIO as GPIO
import time
GPIO.setmode(GPIO.BCM)
# here the pause (in seconds) between switching is declared
delayTime = 1
# Here the input pin is declared to which the sensor is connected. Additionally the PullUP resistor at the input is activated
RELAY_PIN = 24
GPIO.setup(RELAIS_PIN, GPIO.OUT)
GPIO.output(RELAIS_PIN, False)
print ("Sensor test [press CTRL+C to exit test]")
# main program loop
try:
While True:
GPIO.output(RELAIS_PIN, True) # NO is shorted now
time.sleep(delayTime)
GPIO.output(RELAIS_PIN, False) # NC is shorted now
time.sleep(delayTime)
# clean up after the program is finished
except KeyboardInterrupt:
GPIO.cleanup()
Sample program download
To start with the command:
sudo python3 KY019-RPi.py
Code example Micro:Bit
Pinout Micro:Bit:
Micro:Bit | Sensor |
---|---|
Pin 1 | Signal |
3 V | +V |
Ground | GND |
