The KY-034 features a 7 color LED that flashes through a sequence of colors, creating a multicolored pattern of flashing light. The sequence is predefined and cannot be modified.
This module can be used in decorative projects, and it is compatible with Arduino, ESP32, Raspberry Pi, ESP8266, and other popular microcontroller boards.
KY-034 Specifications
This module has a 5mm color LED and a 10 kΩ SMD resistor. The LED flashes in a predefined pattern of alternating colors.
| Working voltage | 3V — 5V DC |
| LED model | YB-3120B4PnYG-PM |
| LED type | 5mm round head |
| Board Size | 16.5mm x 18.5mm [0.65in x 1.73in] |
Connection Diagram
Connect the KY-034’s signal pin (S) to pin 13 on the Arduino, then connect the ground pin (-) to GND.
The middle pin and the (-) pin on the KY-034 are connected, and they both act as ground. You only need to connect one of the pins to GND on the Arduino.
Keep in mind that there are similar modules with a different pin configuration. Always check the pins before connecting your board.
| KY-034 | Arduino |
|---|---|
| S | Pin 13 |
| – | GND |
KY-034 Arduino Code
In the following sketch, we’ll use the pin 13 on the Arduino to repeatedly turn the LED on the module on for 3 seconds and off for a second.
int ledPin = 13; // pin to control KY-034
void setup() {
pinMode(ledPin, OUTPUT); // define pin as output
}
void loop() {
digitalWrite(ledPin, HIGH); // turn LED on
delay(3000); // wait for 3 seconds
digitalWrite(ledPin, LOW); // turn LED off
delay(1000); // wait for a second
}