Two Color LED Module (Red and Green) KY-029

Two Color LED Module (Red and Green) KY-029

Components
DET579
Part.No: KY-029
€2.00
In Stock
Immediate Dispatch
KY-029 Dual Color LED Module (Red & Green) — 3mm common-cathode diffused LED for Arduino and compatible boards. PWM-controllable for variable color output. Compact, low-cost visual indicator for any maker project.

 

The KY-029 (OEM/Keyes) is a dual-color LED module featuring a 3mm red/green common-cathode LED on a compact breakout board. Using PWM on each signal pin, you can independently control red (644nm) and green (571nm) brightness — or blend them for a yellow/amber effect. It is the smaller sibling of the KY-011 (5mm); wiring and code are identical, making it easy to swap between the two.

Key Features

  • Dual-color output (Red + Green): Two independent anodes share a common cathode → blend colors with PWM for richer visual feedback
  • 3mm diffused package: Wide 150° viewing angle distributes light evenly — ideal for panel indicators or enclosures with small apertures
  • Low forward voltage (2.0–2.5V): Works with a simple current-limiting resistor on 5V or 3.3V boards — no level shifter required
  • 10mA rated current per color: Low power consumption keeps heat and energy use minimal in battery-powered builds
  • Common-cathode design: Single GND pin simplifies wiring — only two signal pins needed to drive both colors
  • Wavelengths 571nm (Green) + 644nm (Red): Distinct, saturated hues for clear status indication
  • Luminous intensity 20–40 mcd (green) / 40–80 mcd (red): Visible indoors under normal lighting conditions

Pinout & Wiring

PinSymbolDescription
1GND (–)Common cathode — connect to board GND
2RRed anode — connect via 220Ω (5V) or 120Ω (3.3V) to digital/PWM pin
3GGreen anode — connect via 220Ω (5V) or 120Ω (3.3V) to digital/PWM pin

Wiring note: Always use a current-limiting resistor on each signal pin. On a 5V Arduino, a 220Ω resistor gives ~13mA per color — safely under the 20mA absolute maximum. On 3.3V boards (ESP32, Raspberry Pi), use 120Ω. A 330Ω resistor also works if you prefer a slightly dimmer output.

Compatibility

  • Arduino UNO / Nano / Mega (5V): Use 220Ω resistors on R and G pins. Any digital or PWM-capable pin works.
  • ESP32 / ESP8266 / Raspberry Pi (3.3V): Use 120Ω resistors. All three boards support PWM, enabling full color blending.
  • Drop-in replacement for KY-011: Same pinout, same code — only the LED diameter differs (3mm vs 5mm).

Typical Applications

  • Status indicators: Show OK/Error, On/Off, or Ready/Busy states in green and red — intuitive for any user
  • Smart home dashboards: Indicate sensor thresholds (e.g., green = temperature normal, red = overheating alert)
  • Robot and vehicle builds: Compact size fits tight spaces; use as power or fault indicators
  • Educational Arduino projects: Perfect first PWM exercise — students learn color mixing and GPIO control simultaneously
  • Wearables and small enclosures: 3mm form factor fits flush-mount holes in custom 3D-printed cases

Technical Specifications

ParameterValue
InterfaceDigital / PWM
Forward Voltage2.0–2.5V
Rated Current10mA per color
LED Diameter3mm
Package TypeDiffusion (diffused lens)
Viewing Angle150°
Wavelength — Green571nm
Wavelength — Red644nm
Luminous Intensity — Green20–40 mcd
Luminous Intensity — Red40–80 mcd
LED ConfigurationCommon Cathode
MPNKY-029

FAQ

Q: What is the difference between KY-029 and KY-011?
A: Both are dual-color (red/green) common-cathode LED modules with identical pinout and code. The only difference is LED size: KY-029 uses a 3mm LED, KY-011 uses a 5mm LED. Choose KY-029 for tighter spaces.

Q: Do I need a resistor?
A: Yes — always. The forward voltage is 2.0–2.5V, so without a resistor on a 5V or 3.3V board the LED will draw excessive current and burn out. Use 220Ω for 5V boards and 120Ω for 3.3V boards.

Package Contents: 1× KY-029 Dual Color LED Module (Red & Green)

⚠ Note: Always use current-limiting resistors on both signal pins before connecting to any microcontroller. Omitting resistors will permanently damage the LED.
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