7 Color Flashing LED Module KY-034

7 Color Flashing LED Module KY-034

Components
DET584
Part.No: KY-034
€2.00
In Stock
Immediate Dispatch
KY-034 7 Color Flashing LED Module features an automatic 5mm round high-brightness LED (model YB-3120B4PnYG-PM) with a white mist lens. It cycles through multiple colors autonomously — no microcontroller code required for the flashing effect. Forward voltage: 3.0–4.5V.

 

The KY-034 7 Color Flashing LED Module (MPN: KY-034, LED model: YB-3120B4PnYG-PM) is a compact Arduino-compatible module built around an automatic 5mm round high-brightness LED. Unlike standard single-color LEDs, the KY-034 cycles through multiple colors — including pink, yellow, and green — entirely on its own, driven by an internal controller embedded in the LED itself. No PWM code, no external timing circuit: just power it up and it flashes.

Key Features

  • Automatic 7-color cycling: Built-in controller inside the LED drives the color sequence → zero programming effort for the flashing effect
  • 5mm round form factor: Standard through-hole LED footprint → easy to mount on breadboards, PCBs, and KY-series sensor boards
  • High-brightness output: Colors pink, yellow, and green at high brightness → clearly visible indicator even in ambient light
  • White mist lens: Diffused lens softens the light output → wider viewing angle and smoother color transitions
  • Standard forward voltage 3.0–4.5V: Compatible with common microcontroller supply rails → use with a current-limiting resistor on 3.3V or 5V systems

Pinout & Wiring

PINSymbolDescription
1S (Signal/+)Connect to digital output pin (through a current-limiting resistor, typically 100–220Ω)
2–Middle pin (on 3-pin KY module boards: not connected or GND reference — verify your board silkscreen)
3GNDConnect to ground

⚠ Wiring note: The LED forward voltage is 3.0–4.5V. Always use a current-limiting resistor (100–220Ω recommended) in series to protect both the LED and your microcontroller pin. The automatic flashing is internal — simply applying power is sufficient.

Compatibility

  • Arduino UNO / Nano (5V): Fully compatible — use a 100–220Ω series resistor on the signal/power pin.
  • ESP32 / ESP8266 (3.3V): Compatible within the 3.0–4.5V forward voltage range — a lower resistor value (100Ω) may be needed; verify current limits on 3.3V GPIO pins.
  • Raspberry Pi (3.3V GPIO): Compatible with appropriate series resistor; note RPi GPIO current limits.

Typical Applications

  • Status indicators: Use the automatic color-cycling as a power-on or activity indicator on a project enclosure — no code needed.
  • Decorative lighting projects: Ideal for makers building mood lamps, costumes, or display boards who want dynamic color without complex drivers.
  • Arduino/ESP32 beginner kits: A simple first LED project that produces an impressive visual result immediately.
  • Alert and notification signals: Combine with a transistor or relay to create eye-catching alarm indicators in embedded systems.
  • Educational demonstrations: Demonstrate LED operation, forward voltage, and current limiting in electronics classes.

Technical Specifications

ParameterValue
ModuleKY-034
LED ModelYB-3120B4PnYG-PM
LED Type5mm Round Through-Hole, High Brightness
Lens TypeWhite Mist (Diffused)
ColorsPink, Yellow, Green (automatic cycling)
Standard Forward Voltage3.0 – 4.5V
Color CyclingAutomatic (internal controller)
MPNKY-034

FAQ

Q: Do I need to write any code to make the LED flash and change colors?
A: No. The KY-034 uses an LED with a built-in internal controller (model YB-3120B4PnYG-PM) that drives the color-cycling automatically. Simply connect power and ground through a current-limiting resistor and the module will flash through colors on its own.

Q: What resistor value should I use with the KY-034?
A: A 100–220Ω resistor is typically recommended in series with the signal/power pin. The exact value depends on your supply voltage and desired brightness — use Ohm's Law: R = (Vsupply – Vf) / I, targeting around 10–20mA.

Package Contents: 1× KY-034 7 Color Flashing LED Module

⚠ Note: Always use a current-limiting resistor in series with this module. Connecting directly to a GPIO pin or supply rail without a resistor may damage the LED or the microcontroller.
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