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Arduino and KY-034 7 color flashing LED

by shedboy71

In this article, we connect an KY-034 7 color flashing LED to an Arduino Uno

If the  KY-034 7 color flashing LED module is supplied with voltage, a color sequence is automatically emitted by the LED. The LED has 7 different colors and thus also all resulting mixed colors.

Working voltage 3V — 5V DC
LED model YB-3120B4PnYG-PM
LED type 5mm round head

Parts Required

You can connect to the module using dupont style jumper wire.

This should work with other Arduino board – I have tried an Uno and Mega

Name   Link
Arduino Uno
37 in one sensor kit
Connecting cables



Connect the signal pin (S) to pin 13 on the Arduino, then connect the ground pin (-) to GND.

The middle pin and the (-) pin are connected on this particular module, and they both act as ground.

Code Example

int ledPin = 11;    // 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


Serial Monitor Output






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