Adafruit KB2040 Key Boar

The KB2040 Key Boar is a general purpose RP2040 board supplied by Adafruit.

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Features

  • RP2040 microcontroller chip

  • Dual-core ARM Cortex M0+ processor, flexible clock running up to 133 MHz

  • 264kB of SRAM, and 8MB of on-board Flash memory

  • Castellated module allows soldering direct to carrier boards

  • USB Host and Device support via type C connector.

  • Low-power sleep and dormant modes

  • Drag & drop programming using mass storage over USB

  • 18 multi-function GPIO pins

  • 2× SPI, 2× I2C, 2× UART, 3× 12-bit ADC, 16× controllable PWM channels

  • Accurate clock and timer on-chip

  • Temperature sensor

  • Accelerated floating point libraries on-chip

  • 8 × Programmable IO (PIO) state machines for custom peripheral support

  • On-board STEMMA QT connector for quick I2C connection.

Serial Console

By default a serial console appears on pins 1 (TX GPIO0) and pin 2 (RX GPIO1). This console runs a 115200-8N1.

The board can be configured to use the USB connection as the serial console.

Buttons and LEDs

There is a BOOT button which if held down when power is first applied or the RESET button is pressed will cause the RP2040 to boot into program mode and appear as a storage device to a USB connecte . Saving a .UF2 file to this device will replace the Flash ROM contents on the RP2040.

A RESET button that allows rebooting the board without disconnecting the power.

A ws2812 (NeoPixel) smart RGB LED controlled by GPIO17.

Pin Mapping

Pads numbered anticlockwise from USB connector.

Pad

Signal

Notes

1

D+

Alternate USB data connection.

2

GPIO0

Default TX for UART0 serial console

3

GPIO1

Default RX for UART1 serial console

4

Ground

5

Ground

6

GPIO2

7

GPIO3

8

GPIO4

9

GPIO5

10

GPIO6

11

GPIO7

12

GPIO8

13

GPIO9

14

GPIO10

15

GPIO19

16

GPIO20

17

GPIO18

18

GPIO26

ADC0

19

GPIO27

ADC1

20

GPIO28

ADC2

21

GPIO29

ADC3

22

Ground

23

Raw

Connected to USB +5V line

24

D-

Alternate USB data connection.

The board has a STEMMA QT connector that is also connected to pins GPI12 (I2C1 SDA) and GPI13 (I2C1 SDA).

Power Supply

The Raspberry Pi Pico can be powered via the USB connector, or by supplying +5V to pin 23.

The Raspberry Pi Pico chip run on 3.3 volts. This is supplied by an onboard voltage regulator.

Configurations

audiopack

NuttShell configuration (console enabled in UART0, at 115200 bps) with support for NSPlayer audio player.

composite

NuttShell configuration (console enabled in UART0, at 115200 bps) with support for CDC/ACM with MSC USB composite driver.

displaypack

NuttShell configuration (console enabled in USB Port, at 115200 bps) supporting ST7789 video display.

enc28j60

NuttShell configuration (console enabled in UART0, at 115200 bps) with support for NC28J60.

lcd1602

NuttShell configuration (console enabled in UART0, at 115200 bps) with support for LCD1602.

nsh

Basic NuttShell configuration (console enabled in UART0, at 115200 bps).

nsh-flash

Basic NuttShell configuration (console enabled in UART0, at 115200 bps with SMART flash filesystem.

nshsram

NuttShell configuration (console enabled in UART0, at 115200 bps) with interrupt vectors in RAM.

smp

Basic NuttShell configuration (console enabled in UART0, at 115200 bps) with both ARM cores enabled.

spisd

NuttShell configuration (console enabled in UART0, at 115200 bps) with SPI configured.

ssd1306

NuttShell configuration (console enabled in UART0, at 115200 bps) with support for ssd1306.

st7735

NuttShell configuration (console enabled in UART0, at 115200 bps) with support for st7735.

usbmsc

NuttShell configuration (console enabled in UART0, at 115200 bps) with support for usbmsc.

usbnsh

Basic NuttShell configuration (console enabled in USB Port, at 115200 bps).

waveshare-lcd-1.14

NuttShell configuration (console enabled in UART0, at 115200 bps) with support for st7789.

waveshare-lcd-1.3

NuttShell configuration (console enabled in UART0, at 115200 bps) with support for usbmsc.