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 https://elecena.pl/product/22727664/m5stack-cardkb-mini-keyboard-programmable-unit-v1-1-mega8a 2023-03-07 https://elecena.pl/product/22727664/m5stack-cardkb-mini-keyboard-programmable-unit-v1-1-mega8a 2023-12-27 https://elecena.pl/product/22727664/m5stack-cardkb-mini-keyboard-programmable-unit-v1-1-mega8a 2024-07-18 https://elecena.pl/product/22727664/m5stack-cardkb-mini-keyboard-programmable-unit-v1-1-mega8a 2024-09-18 https://elecena.pl/product/22727664/m5stack-cardkb-mini-keyboard-programmable-unit-v1-1-mega8a 2024-11-29 https://elecena.pl/product/22727664/m5stack-cardkb-mini-keyboard-programmable-unit-v1-1-mega8a 2024-11-30 https://elecena.pl/product/22727664/m5stack-cardkb-mini-keyboard-programmable-unit-v1-1-mega8a 2025-04-29 https://elecena.pl/product/22727664/m5stack-cardkb-mini-keyboard-programmable-unit-v1-1-mega8a 2025-11-28 https://elecena.pl/product/22727664/m5stack-cardkb-mini-keyboard-programmable-unit-v1-1-mega8a 2025-11-29