5V 1 Channel Relay Module KY-019

Description

What is it The KY-019 relay module is a low-cost electronic component designed for use with Arduino or other microcontrollers. This module allows you to control electrical devices using digital signals provided by the microcontroller. Features Vcc: 5V, N channels: 1 What is it used for The KY-019 relay is used to protect the microcontroller from high electrical currents, allowing you to control devices such as lamps or motors. It is compatible with Arduino and other 5V-compatible microcontrollers. How to use the KY-019 relay Follow these steps to use the KY-019 relay with Arduino: 1. Connect the KY-019 relay to pin 8 of Arduino. 2. Connect the 1kΩ resistor between the relay VCC pin and the 5V power source. 3. Connect the relay GND pin to the Arduino GND. 4. Connect the relay COM pin to your load (the relay acts as a switch). 5. Connect the relay NO pin to an Arduino pin (e.g., D2). 6. Upload the code to Arduino. 7. Power on the source and check that the relay closes. 8. Verify on the datasheet if necessary. Example code “`void setup() { pinMode(2, OUTPUT);}void loop() { digitalWrite(2, HIGH); delay(2000); digitalWrite(2, LOW); delay(2000);}“` Mini-project Create a system to turn a lamp on and off using the KY-019 relay and a switch. Common errors Do not verify the specifications on the datasheet. Directly connect the relay VCC pin to Arduino. Do not use a resistor between VCC and power. Do not check the relay’s maximum current. Recommended accessories LED lamp Switch 5V power supply Test cable Frequently asked questions Does the KY-019 relay work with Arduino? Yes, it works with Arduino UNO and compatible models. Which Arduino pin should I use? You can use any digital pin on Arduino. How long does the connection last? The KY-019 relay remains closed until it is deactivated.