KY-040 Rotary Encoder Module for Arduino STM32 - Position and Rotation Measurement

KY-040 Rotary Encoder Module

The KY-040 rotary encoder is a reliable and versatile device designed for precise measurement of shaft position and rotation. It works excellently with stepper motors and servo mechanisms. The module is fully compatible with popular microcontroller platforms - ESP8266, ESP32, Arduino, Raspberry Pi, and STM32 - making it an ideal choice for both hobby projects and professional applications.

Key technical features

The device registers shaft rotation with very high accuracy, generating 20 pulses per full rotation (360°). An additional advantage of the module is the integrated push button on the encoder shaft, which can be used successfully for triggering events or menu navigation. The encoder operates over a wide supply voltage range from 2.5 V to 5 V, providing great flexibility and easy integration with various logic circuits.

Technical specifications

• Supply voltage: 2.5 - 5 V
• Rotation range: 360°
• Resolution: 20 pulses per rotation
• Built-in push button
• Module dimensions: 32 x 19 x 30 mm

Example applications

• Menu navigation in user interfaces with displays
• Precise parameter adjustment in audio systems and amplifiers
• Value setting and control in digital bench power supplies
• Position and speed control in stepper motor projects
• Control element in Smart Home systems and IoT devices

Benefits of choosing this module

• Trouble-free and fast integration with microcontroller systems
• High durability and reliability thanks to proven mechanical design
• Space saving on the panel by combining encoder and button in one component
• Power supply versatility allowing operation with 3.3 V and 5 V logic
• Infinite shaft rotation enabling continuous adjustment without mechanical stops