QT Py (RP2040 based)

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QT Py RP2040.PNG XIAO-RP2040.PNG

RP2040 QT Py

  • Adafruit QT Py RP2040 Product page or Seeed XIAO RP2040 Product page
  • USB Type C connector
  • RP2040 32-bit Cortex M0+ dual-core
  • Runs at ~125 MHz
  • 264 KB RAM
  • 8 MB SPI FLASH chip for storing files and CircuitPython/MicroPython code storage (Adafruit), 2 MB SPI Flash (Seeedstudio)
    • No EEPROM
  • Can be used with MicroPython or CircuitPython
  • Built-in RGB NeoPixel LED
  • 13 GPIO pins (11 breakout pads and two QT pads):
    • Four 12 bit ADCs (one more than Pico)
    • Two I2C ports (one on the QT connector, one on the breakout pads)
    • SPI and UART peripherals, in standard QT Py locations,
    • PWM outputs on every IO pin - for servos, LEDs, etc
    • There are 6 GPIO in consecutive order for PIO compatibility
  • 3.3V logic and power 600 mA
  • Both Reset button and Bootloader select buttons for quick restarts (no unplugging-replugging to relaunch code)

Pins (RP2040 version)

  • Pins are different in MicroPython between Seeeduino XIA and Adafruit QT Py

Adafruit RP2040

Adafruit products qtpy-rp2040-pins.png

3V

  • Regulated output from the onboard regulator. You can draw 500mA

5V

  • 5v out from the USB port.
  • Voltage input
    • Requires external diode
      • Schottky, signal, power
      • Between external power source and this pin
      • Cannot power the USB port by supplying 5V to this pin
        • There is a protection diode that prevents the 5V from reaching the USB connector.
        • This is to protect host computer USB ports, etc.

A0 / D0 - Digital/analog GPIO pin 0

  • Digital I/O 0
  • GPIO29 in MicroPython
  • Analog In 0
  • True analog output with 10 bit precision
  • Does not have PWM
  • Capacitive touch input.

A1 / D1 - Digital/analog GPIO pin 1

  • Digital I/O 1
  • GPIO28 in MicroPython
  • Analog In 1
  • Capacitive touch input
  • AREF pin.

A2 / D2 - Digital/analog GPIO pin 2

  • Digital I/O 2
  • GPIO27 in MicroPython
  • Analog In 2
  • PWM
  • Capacitive touch input.

A3 / D3 - Digital/analog GPIO pin 3

  • Digital I/O 3
  • GPIO26 in MicroPython
  • Analog In 3
  • PWM output
  • Capacitive touch input.

SDA / D4

  • Digital I/O 4
  • I2C SDA pin
  • PWM output
  • GPIO24 in MicroPython
  • No analog on this pin
  • No pull up on this pin
  • When using with I2C requires an external 2.2K-10K pullup to 3.3V.

SCL / D5

  • Digital I/O 5
  • I2C SCL
  • GPIO25 in MicroPython
  • No analog on this pin
  • No pull up on this pin
  • When using with I2C requires an external 2.2K-10K pullup to 3.3V.

TX / A6 / D6

  • Digital I/O 6
  • Transmit (output) for Serial1
  • GPIO20 in MicroPython
  • Analog 6
  • PWM output
  • Capacitive touch input

RX / A7 / D7

  • Digital I/O 7
  • Receive (input) for Serial1
  • GPIO5 in MicroPython
  • Analog 7
  • PWM output
  • Capacitive touch input

SCK / A8 / D8

  • Digital I/O 8
  • SPI SCK pin
  • GPIO6 in MicroPython
  • Analog 8
  • PWM output

MISO / A9 / D9

  • Digital I/O 8
  • SPI MISO pin
  • GPIO4 in MicroPython
  • Analog 8
  • PWM output

MOSI / A10 / D10

  • Digital I/O 10
  • SPI MOSI pin
  • GPIO3 in MicroPython
  • Analog 10
  • PWM output

NeoPixel

  • NEOPIXEL LED Features
    • Individually addressable and programmable RGB LEDs
    • Operating voltage: 3.3V to 5V
    • Power consumption: 60mA per LED at full brightness
    • Communication: PWM through data pin
    • Driver IC: WS2812
  • Data = Pin 11
  • Power = Pin 12 - set low for low power usage
  • By default pin 12 is set high by Arduino/CircuitPython
  • Code example
import board
import neopixel

pixels = neopixel.NeoPixel(board.NEOPIXEL, 1)
# fill((rVal, gVal, bVal))
# rVal, gVal, bVal = red/green/blue values (0-255)
pixels.fill((255, 0, 0))  # Note double parens

Seeeduino RP2040

Seeed-xinpin-rp2040.jpg

3V

  • Regulated output from the onboard regulator. You can draw 500mA

5V

  • 5v out from the USB port.
  • Voltage input
    • Requires external diode
      • Schottky, signal, power
      • Between external power source and this pin
      • Cannot power the USB port by supplying 5V to this pin
        • There is a protection diode that prevents the 5V from reaching the USB connector.
        • This is to protect host computer USB ports, etc.

A0 / D0 / P26 - Digital/analog GPIO pin 0

  • Digital I/O 0
  • Analog In 0
  • P26 in Arduino/MicroPython
  • True analog output with 10 bit precision
  • Does not have PWM
  • Capacitive touch input.

A1 / D1 - Digital/analog GPIO pin 1

  • Digital I/O 1
  • P27 in Arduino/MicroPython
  • Analog In 1
  • Capacitive touch input
  • AREF pin.

A2 / D2 - Digital/analog GPIO pin 2

  • Digital I/O 2
  • P28 in MicroPython
  • Analog In 2
  • PWM
  • Capacitive touch input.

A3 / D3 - Digital/analog GPIO pin 3

  • Digital I/O 3
  • P29 in Arduino/MicroPython
  • Analog In 3
  • PWM output
  • Capacitive touch input.

SDA / D4

  • Digital I/O 4
  • P7 in Arduino/MicroPython
  • I2C SDA pin
  • PWM output
  • No analog on this pin
  • No pull up on this pin
  • When using with I2C requires an external 2.2K-10K pullup to 3.3V.

SCL / D5

  • Digital I/O 5
  • P7 in Arduino/MicroPython
  • I2C SCL
  • No analog on this pin
  • No pull up on this pin
  • When using with I2C requires an external 2.2K-10K pullup to 3.3V.

TX / A6 / D6

  • Digital I/O 6
  • Transmit (output) for Serial1
  • P0 in Arduino/MicroPython
  • Analog 6
  • PWM output
  • Capacitive touch input

RX / A7 / D7

  • Digital I/O 7
  • Receive (input) for Serial1
  • P1 in Arduino/MicroPython
  • Analog 7
  • PWM output
  • Capacitive touch input

SCK / A8 / D8

  • Digital I/O 8
  • SPI SCK pin
  • P2 in Arduino/MicroPython
  • Analog 8
  • PWM output

MISO / A9 / D9

  • Digital I/O 8
  • SPI MISO pin
  • P4 in Arduino/MicroPython
  • Analog 8
  • PWM output

MOSI / A10 / D10

  • Digital I/O 10
  • SPI MOSI pin
  • P3 in Arduino/MicroPython
  • Analog 10
  • PWM output

On-board LEDs

XIAO LEDs xinfront-720px.jpg

  • Red Power LED
  • USER LED (RGB)
  • NEOPIXEL LED Features
    • Individually addressable and programmable RGB LEDs
    • Operating voltage: 3.3V to 5V
    • Power consumption: 60mA per LED at full brightness
    • Communication: PWM through data pin
    • Driver IC: WS2812
    • NEOPIXEL Power - GPIO11 - set low for low power usage
    • NEOPIXEL Data - GPIO12
    • NEOPIXEL Demo

Programming

  • C/C++
  • CircuitPython
  • MicroPython

C/C++

C/C++ Adafruit RP2040

C/C++ Seeeduino RP2040

CircuitPython/MicroPython

CircuitPython

  • CircuitPython is a derivative of MicroPython
  • Autorun code - CircuitPython looks for a code file on the board to run
    • There are four options: code.txt, code.py, main.txt and main.py
    • CircuitPython looks for those files, in that order, and then runs the first one it finds
  • Mu code editor

CircuitPython for Adafruit RP2040

import gc
gc.mem_free()
Install CircuitPython on Adafruit QT Py RP2040
Updating CircuitPython
  • Save the contents of CIRCUITPY, just in case
  • Double-click the reset button to show the BOOT drive
  • Drag the update-bootloader .uf2 file to the BOOT drive
  • Wait a few tens of seconds for the bootloader to update; the BOOT drive will reappear
  • Check INFO_UF2.TXT to verify that the bootloader version has been updated. Then you will need to reload CircuitPython.
  • Update mpy files

CircuitPython for Seeed XIAO RP2040

  • XIAO RP2040 with CircuitPython
    • Long press the "BOOT" button. (The "B" is written on the board shown to the right)
    • Connect the XIAO PR2040 to your computer while you still pressing the button.
    • The computer then will appear a disk driver(RP1-RP2)
    • Download the XIAO-RP2040-CircuitPython.uf2 file for XIAO RP2040
    • Drag the .urf file to the disk driver("RP1-RP2")
    • Check the disk drive if the name has changed to "CIRCUITPY" (takes a few seconds)
  • Free memory
>>> import gc
>>> gc.mem_free()
208128
>>> import time
>>> gc.mem_free()
207952
Install CircuitPython on Seeed XIAO RP2040

Land Boards CircuitPython Code

I2CIO-8 (MCP23008) Drivers
SWLEDX8-I2C (MCP23017) Drivers
PROTO16-I2C (MCP23017) Drivers

Digital I/O Example

import board
import digitalio
import time

led = digitalio.DigitalInOut(board.D13)
led.direction = digitalio.Direction.OUTPUT

while True:
    led.value = True
    time.sleep(0.1)
    led.value = False
    time.sleep(0.5)

Flash EEPROM 2 MB

  • EEPROM installs on card bottom side

QT Py 4600-07.jpg

QT Py Breakout Board

QT Py Breakout P18212-720px.jpg

  • Built onto GRID49 card
  • Socket for QT Py
  • QT Py pins brought to header strips
  • 3.3V power distribution on 2x8 header

Pins (CCW direction)

  • S12 = A0
  • R12 = A1
  • Q12 = A2
  • P12 = A3
  • N12 = SDA
  • M12 = SCL
  • L12 = TX
  • L1 = RX
  • M1 = SCK
  • N1 = MI
  • P1 = MO
  • Q1 = 3.3V
  • R1 = GND
  • S1 = 5V
  • A6=B6=C6=D6=E6=F6=G6=H6 = GND
  • A7=B7=C7=D7=E7=F7=G7=H7 = 3.3V

QTPy49 Board

QTPy49 FRONT REV1.png

Videos

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