Original M5Stack CardKB Mini Keyboard Programmable Unit V1.1 (MEGA8A) – PartsCountry

Description

The M5Stack CardKB v1.1 is a card-size ’50 key’ QWERTY keyboard which adopts an ATMega8A as the MCU. It features an I2C communication port and one ‘RGB-LED’ indicator.

Consider that you want to make some cool stuff that requires keyboard typing and interaction, but the M5 core by itself only has a few buttons, what can you do? Well, you can use a CardKB!

CardKB also can achieve button combinations (Sym+Key, Shift+Key, Fn+Key) and output richer key values. This unit communicates with M5Core units through GROVE A port (I2C interface). The default Address is 0x5F.

Instructions

• Single button pressed: Keyboard will output the first key value (the letter button will output in a lowercase form). E.g if “Q” was pressed, the keyboard will output “q” (lowercased).
• Sym+key: Keyboard will output the second key value. E.g if “Sym” was pressed and then “Q” was pressed, the keyboard will output “{“. If “Sym” was double pressed, then the keyboard will lock this function, all key pressed will output it’s second key value.
• Shift+key: If a letter button was pressed, it’ll output upper case form. E.g if “Shift” was pressed and then “Q” was pressed, the keyboard will output “Q”. If “Shift” was double pressed, then the keyboard will lock this function, all letter keys pressed will output its upper case form.
• Fn+key (custom function key combination): Keyboard will output the third key value. You can customize what function the key presses correspond to.

Features

• Full-function keyboard, multi-key combination
• GROVE interface, support UIFlow and Arduino
• Two building brick-compatible holes
• Protocol type I2C
• I2C Address: 0x5F

Package Contents

• 1x CardKB1.1 unit
• 1x GROVE Cable

Specifications

MCU	ATMega8A
Number of keys	50
RGB LED	1 piece
Communication method	I2C
Net weight	17g
Gross weight	18g
Product Size	88*54*5mm
Package Size	88*58*5mm

Resources

• Product Documentation
• Example Arduino code
• UIFlow Example code
• CardKB Firmware
• Project example: LoRa QWERTY Messenger

Pinout

M5Core (GROVE A)	GPIO22	GPIO21	5V	GND
CardKB	SCL	SDA	5V	GND