U215 · M5Stack
Unit CardKB2 is a card-sized 42-key portable keyboard input unit. Its compact and lightweight form factor makes it ideal for on-the-go use and embedded integration. Powered by an ESP32-C61HF4 MCU with built-in 2.4 GHz Wi-Fi 6 support, the pre-installed firmware allows flexible configuration across four communication modes: I2C, UART, BLE HID, and ESP-NOW. The unit features an onboard HY2.0-4P expansion interface and a USB Type-C port for power supply and firmware flashing. Additional… (M5Stack U215)
| Part number | U215 |
|---|---|
| Manufacturer | M5Stack |
| Category | User Input & Controls › Buttons & Keypads |
| Pins | 4 |
| Frequency | 2.4 GHz |
CardKB2 Keyboard Unit (ESP32-C61) pinout
| Pin | Name | Type | Description |
|---|---|---|---|
| 1 | SCL | input | |
| 2 | SDA | bidirectional | |
| 3 | 5V | power | |
| 4 | GND | ground |
Schematic symbol and footprint
Schematic symbol
Footprint: Grove HY2.0 4-pin through-hole, 2.0 mm pitch — to scale, pad 1 in yellow (mm). Check against the datasheet before ordering PCBs.
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