KY-034 7 Color Flashing LED Module

KY-034 7 Color Flashing LED Module is a compact and highly versatile component that instantly adds dynamic, multi-color visual effects to any electronics project without requiring complex coding or external control pins. This module integrates a common cathode 5mm RGB LED with an internal control circuit, which automatically cycles through seven distinct colors (Red, Green, Blue, Cyan, Magenta, Yellow, White) in a smooth, continuous transition. Therefore, the KY-034 significantly simplifies implementation, allowing hobbyists and students to create captivating lighting displays using only power and ground connections. Furthermore, its small size and three-pin interface make it perfectly suited for use with Arduino, Raspberry Pi, and other popular microcontroller platforms where space and simplicity are key considerations.

Key Features:

• Automatic Color Cycling: The module features an integrated chip that autonomously manages the color transition sequence, eliminating the need for PWM control from a host microcontroller.
• Seven Distinct Colors: Cycles through the primary and secondary colors (R, G, B, C, M, Y, W) in a continuous and visually appealing pattern.
• Single Power Input: Operates using just one VCC and one GND connection, making the wiring process exceptionally simple.
• Integrated Current Limiting: Includes a built-in resistor on the module, which safely limits the current for the LED when operating at 5V.
• Common Cathode RGB LED: Uses a standard 5mm common cathode RGB LED, simplifying interfacing with ground-referenced systems.

Technical Specifications:

• LED Type: 5mm Diffused RGB LED
• Operating Voltage (V_CC): 3.0 V to 5.5 V DC
• Internal Control: Built-in flashing/cycling IC (typically a custom ASIC)
• Color Sequence: Automatic 7-color transition
• Current Draw: ≈ 20 mA (Varies during color cycle)
• Pin Pitch: 2.54 mm (Standard header pitch)

Mechanical Specifications:

• Module Dimensions: Small rectangular PCB, typically 18.5 mm x 15 mm
• Mounting: Two standard mounting holes are often included for secure placement.
• LED Lens Type: Diffused lens for wide viewing angle and smooth light blending.
• Connection Type: 3-pin male header connector (Signal, VCC, GND).

Dimensions:

• PCB Length: ≈ 18.5 mm
• PCB Width: ≈ 15 mm
• Maximum Height (with LED): ≈ 10 mm
• Weight: ≈ 2 g (Extremely lightweight)

Pinout and Wiring:

• Pin S (Signal / No Connect): This pin is often unused in the automatic flashing mode, but however, in some variants, it can act as an enable pin.
• Pin + (VCC): Connect to the positive power supply (typically 5V from Arduino or 3.3V from a compatible source).
• Pin − (GND): Connect to the common circuit ground reference.
• Wiring Note: Simply connect VCC and GND pins to power the module, and the 7-color flashing sequence will start immediately without any code execution required.

Datasheet Reference:

• Download KY-034 Flashing LED Module Reference Sheet

Commonly Used in:

• Hobbyist Prototyping: Ideal for rapidly adding visual feedback and flair to Arduino and Raspberry Pi projects.
• Educational Kits: Used extensively in beginner electronics kits to teach basic circuit connection and visual output.
• Device Status Indicators: Employed as a “Power On” or “Active State” indicator where dynamic status is needed.

Applications:

• Decorative Lighting: Creating simple, constantly changing color effects for models, displays, and small enclosures.
• Visual Alarms/Alerts: Serving as a highly noticeable visual indicator for non-critical alerts in IoT devices.
• Toy and Gadget Enhancements: Adding dynamic RGB elements to custom-built toys and portable electronics.

Equivalent Models:

• Self-Flashing RGB LED: Any 5mm or 8mm LED with a built-in auto-flashing IC is functionally equivalent, often sold without the module PCB.
• KY-016 (Standard RGB Module): While not self-flashing, this model can achieve similar color effects only if a host microcontroller drives it with PWM signals.
• Slow-Flashing LED Modules: Modules containing LEDs that cycle colors at a slower rate offer a similar function but with different timing.

Package Includes:

• 1 x KY-034 7 Color Flashing LED Module