Multifunctional keypad

Onboard hardware

Bluetooth module

Establish Bluetooth connection with MCU and computer through Bluetooth module to provide wireless usage function.

MCU

HK Hangshun chip, because this MCU does not have USB pin support, it uses a serial port to send data, which requires onboard USB to TTL conversion.

Charging circuit

Charge the lithium battery and ensure the use of Bluetooth function.

Knob EC11

Functions such as rotation, press rotation, etc. can be performed through the EC11 module.

button

Provides four mechanical buttons, four silent buttons and one side button.

software programming

python host computer

Redefine the key functions through the python host computer.

Serial port opening interface

Select the serial port for communication between the host computer and the device.

Keyboard preset selection interface

A variety of presets can be selected, and the saved preset files will be automatically opened upon startup.

Keyboard preset setting interface

Each button can be programmed.

Knob function settings

Different modes are designed for the three states of the knob (rotate, press, press to rotate), which mainly include music switching, volume control, brightness control and other functions.

MQTT service interface

MQTT messages can be bound to each button, which can be used for device control, Homeassistant device control, etc.

Other functions

It can be connected to the smart home category to control the brightness of smart furniture, etc. This can be achieved by binding MQTT messages through buttons.

Python host computer open source address

Host computer