ky 040 serial monitor

Real-time serial port monitor with Web Serial API support for debugging and interacting with serial devices

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About This Tool

The KY-040 Serial Monitor is a fully functional web-based tool that allows you to connect to serial devices directly from your browser using the Web Serial API. Monitor incoming data, send commands, configure baud rates, and simulate KY-040 rotary encoder inputs. Perfect for debugging Arduino projects, IoT devices, and other serial communication applications without requiring additional software installation.

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How to Use

Click 'Connect to Serial Port' to select your device\n
Choose baud rate from dropdown (9600, 115200, etc.)\n
Monitor incoming data in real-time display\n
Use 'Send Data' to transmit commands to your device\n
Click 'Simulate KY-040' to generate rotary encoder test patterns\n
Use 'Clear Display' to reset the data log\n
Click 'Disconnect' when finished

Frequently Asked Questions

Find Quick Answers

What browsers support the Web Serial API?

Chrome/Edge 89+ and Opera 76+ support Web Serial API. Firefox and Safari do not currently support it.

What is a KY-040 rotary encoder?

KY-040 is a common rotary encoder module used with Arduino and other microcontrollers for position sensing and user input.

Can I save the serial data logs?

Yes, use the 'Copy Logs' button to copy all displayed data to clipboard for pasting into other applications.

Why can't I see my serial port?

Ensure your device is properly connected and drivers are installed. Web Serial API only shows ports the browser has permission to access.

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