Model: KY040 Working voltage: 5V Pulses per revolution: 20 The KY040 rotary encoder module provides bidirectional pulse output as you rotate the knob. It can be counted in the positive direction or in the reverse direction, and the output pulse frequency reflects the rotation rate. Key benefits Unlimited counting: unlike a rotary potentiometer, the count is not limited by the number of turns. Clear direction information: pulses indicate rotation direction, enabling signed counting in your project. Simple reset: the builtin push button resets the count to zero, allowing quick restarts in testing or usage. 5V compatibility: designed for common 5V microcontroller platforms, such as Arduinobased projects. What makes it stand out Durable, easytouse rotary encoder with a straightforward countandreset workflow. No mechanical end stops or travel limits, suitable for continuous rotation counting in various applications. Specifications and compatibility Model: KY040 Working voltage: 5V Pulses per revolution: 20 Output: bidirectional pulse stream with a resettable counter via the push button Designed for integration with 5V logic microcontrollers and development boards Use scenarios User interface and navigation: rotate to adjust values or scroll through menu options, then press the button to reset the count to zero when needed. Rotation monitoring and RPM estimation: attach to a rotating component to generate pulses for RPM calculation and speed analysis. Robotics and automation: track wheel or joint rotations to measure distance traveled or to synchronize motion between components. Notes The reset button returns the current count to zero, starting anew from 0 on the next rotation. This module is suitable for hobbyist and educational projects, as well as embedded design prototyping where reliable, bidirectional rotation counting is required.