KY-040 Rotary Encoder Module with Pushbutton Switch for Arduino Raspberry Pi

$7.19

**KY-040 Rotary Encoder Module with Pushbutton Switch for Arduino & Raspberry Pi**Unlock versatile control with the KY-040 Rotary Encoder! This 360° continuous rotary input module features a built-in pushbutton, ideal for Arduino, Raspberry Pi, and ESP32 projects. Effortlessly navigate menus, adjust volume, or control motor speeds with precise, tactile response.**Key Features:**- **360° Continuous Rotation:** Enjoy unrestricted motion in both directions.- **20 Detents Per Revolution:** Experience tactile clicks every 18° for accurate input.- **Quadrature Output:** Reliable direction detection with dual-channel signals.- **Easy Integration:** Just connect with jumper wires; on-board 10kΩ pull-up resistors included.- **Compatible:** Works seamlessly with 5V and 3.3V systems.**Applications:**Perfect for menu navigation, volume control, and manual jog controls in CNC or 3D printers. **Fast Free US Shipping | Hassle-Free Returns | Responsive Customer Support**Elevate your electronic projects today!

Electronics for IoT, Prototyping & DIY

The KY-040 Rotary Encoder Module is a continuous 360° rotary input device with a built-in pushbutton switch. It outputs digital quadrature signals that let your microcontroller detect both the direction and amount of rotation -- perfect for menu navigation, volume controls, and motor speed adjustment. On-board 10kΩ pull-up resistors on all signal lines mean you can connect directly to your Arduino with just jumper wires.

⚡ Key Features

Continuous 360° Rotation -- No mechanical stops; spins freely in both directions
20 Detents Per Revolution -- Tactile clicks at every 18° for precise step-by-step input
Quadrature Output (CLK + DT) -- Two-channel digital output for reliable direction detection
Built-in Pushbutton Switch -- Press the shaft to activate a normally-open momentary switch (active LOW)
On-Board Pull-Up Resistors -- 10kΩ pull-ups on CLK, DT, and SW lines -- no external resistors needed
5V and 3.3V Compatible -- Works with Arduino, Raspberry Pi, ESP32, STM32, and more
Simple 5-Pin Interface -- CLK, DT, SW, +, GND -- connect with standard jumper wires

🔧 How It Works

The encoder contains two internal switches that connect output pins A (CLK) and B (DT) to ground as the shaft rotates.
At each of the 20 resting positions (detents), both switches are in the same state.
When you rotate one click, both switches change state -- but the order they change tells you the direction: CLK changes first for clockwise, DT changes first for counter-clockwise.
Your microcontroller reads these two signals and compares their states to determine direction and step count.
The pushbutton is a separate switch -- press the shaft down and the SW pin goes LOW; release and it returns HIGH via the on-board pull-up.

📐 SpecificationsModelKY-040Encoder TypeIncremental rotary encoderOperating Voltage5V DC (also works with 3.3V)Detents Per Revolution20 (18° per detent)Pulses Per Revolution20RotationContinuous 360° (no mechanical stops)Pushbutton SwitchNormally open, momentary (active LOW)On-Board Pull-Up Resistors10kΩ on CLK, DT, and SWOutput Signal2-bit quadrature (Gray code)Module DimensionsApprox. 30 × 18 × 30 mm (1.18 x 0.71 x 1.18 inches) L × W × H📦 What\'s in the Box

1x KY-040 Rotary Encoder Module (with knob shaft)
Mounting nut

Jumper wires, Arduino board, and knob cap are not included. Any standard 6mm D-shaft knob will fit.

🔌 Compatible With

Arduino (Uno, Mega, Nano, Leonardo, Due, and compatibles)
Raspberry Pi (all models -- use 3.3V logic)
ESP32 / ESP8266
STM32, Teensy, and other 3.3V–5V microcontrollers
PIC and AVR microcontrollers

🎯 Typical Applications

Menu navigation and selection on LCD/OLED displays
Volume and brightness controls
Parameter adjustment (set points, thresholds, timer values)
Stepper and servo motor speed/direction control
Scrolling through lists or data
CNC and 3D printer manual jog controls
DIY audio equipment (amplifiers, mixers)
Robotics -- steering and configuration input

⚠️ Important Notes

Mechanical encoders produce contact bounce -- use software debouncing or add 100nF capacitors between CLK/GND and DT/GND for clean signals.
For best responsiveness, connect CLK and DT to interrupt-capable pins (Pins 2 and 3 on Arduino Uno).
Keep jumper wires under 20cm (8 inches) to minimize electrical noise.
The module includes pull-up resistors -- you generally do not need to enable Arduino\'s internal pull-ups for CLK and DT.

🏪 About Envistia Mall

Envistia Mall is a US-based electronics retailer specializing in development boards, sensors, modules, and components for makers, engineers, and educators. We ship from the United States with fast handling times. Product documentation and technical support are available at our dedicated support site.

📦 Fast Free US Shipping | 🔄 Hassle-Free Returns | 📧 Responsive Customer Support

Visit our store for compatible sensor modules, jumper wires, breadboards, OLED displays, and more accessories for your Arduino and Raspberry Pi projects.

KY-040 Rotary Encoder Module with Pushbutton Switch for Arduino Raspberry Pi

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