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| − | == Two Versions of the QT Py == | + | [[File:tindie-mediums.png|link=https://www.tindie.com/products/27066/]] |
| | | | |
| − | * AdaFruit has SAMD21 and RP2040 versions of the QT Py
| + | [[FILE:QTPy49_P18254-720px.jpg]] |
| − | ** Same pinouts/form factors
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| − | * RP2040 vs SAM version
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| − | ** RP2040 is faster (125 MHz vs 48 MHz)
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| − | ** RP2040 has 2 cores vs 1
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| − | ** RP2040 has more Flash
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| − | ** RP2040 has more SRAM
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| − | ** The RP2040 version is more expensive, but about the same cost if the SAM version is used with an external Flash
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| | | | |
| − | === SAMD21 QT Py=== | + | <video type="youtube">iI9lUsVSuF8</video> |
| | | | |
| − | [[File:QT_Py_4600-06.jpg]]
| + | == Two Versions of the QT Py == |
| − | | |
| − | <video type="youtube">0Qssr6B6MrU</video>
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| − | | |
| − | * [https://www.adafruit.com/product/4600 Adafruit QT Py SAMD21 Product Page]
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| − | ** ATSAMD21E18 32-bit Cortex M0+ version
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| − | ** 48 MHz, 32-bit processor
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| − | ** 256KB Flash
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| − | ** 32 KB RAM
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| − | * Native USB supported by every OS
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| − | ** Can be used in Arduino or [https://circuitpython.org/ CircuitPython] as USB serial console, MIDI, Keyboard/Mouse HID, even a little disk drive for storing Python scripts.
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| − | * Built in RGB NeoPixel LED
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| − | * 11 GPIO pins:
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| − | ** True analog output on one I/O pin
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| − | *** Can be used to play 10-bit quality audio clips in Arduino
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| − | **** CircuitPython does not have storage for audio clips
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| − | ** 9 x 12-bit analog inputs (SDA/SCL do not have analog inputs)
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| − | ** 1 x Optional AREF on A1
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| − | ** 9 x PWM outputs (A0 is analog out, A1 is not PWM capable)
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| − | ** Hardware I2C port with STEMMA QT plug-n-play connector
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| − | ** Hardware UART
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| − | ** Hardware SPI
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| − | ** Hardware I2S
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| − | ** 6 x Capacitive Touch with no additional components required
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| − | * 3.3V regulator with [https://www.diodes.com/assets/Datasheets/AP2112.pdf 600mA peak output] AP2112
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| − | * Optional SOIC-8 SPI Flash chip on bottom
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| − | ** Can't use castellated pins if Flash on bottom is installed
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| − | ** [https://www.adafruit.com/product/4763 GD25Q16]
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| − | ** Access the SPI flash in Arduino on SPI1 and chip select pin 17
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| − | ** In CircuitPython, a '[https://circuitpython.org/board/qtpy_m0_haxpress/ haxpress]' version of the runtime will need to be installed, so it knows to look for the larger filesystem
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| − | ** There is more hardware support in the haxpress CircuitPython build because we can add more code to the internal flash instead of using it for a filesystem
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| − | * Reset switch for starting your project code over or entering bootloader mode
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| − | * USB Type C connector
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| − | | |
| − | === RP2040 QT Py ===
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| − | | |
| − | [[file:QT Py RP2040.PNG]]
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| − | | |
| − | <video type="youtube">00t5y4nQlH8</video>
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| − | | |
| − | * [https://www.adafruit.com/product/4900 Adafruit QT Py RP2040 Product page]
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| − | * USB Type C connector
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| − | * RP2040 32-bit Cortex M0+ dual-core
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| − | * Runs at ~125 MHz
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| − | * 264 KB RAM
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| − | * 8 MB SPI FLASH chip for storing files and CircuitPython/MicroPython code storage. No EEPROM
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| − | * Can be used with MicroPython or CircuitPython
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| − | * Built-in RGB NeoPixel LED
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| − | * 13 GPIO pins (11 breakout pads and two QT pads):
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| − | ** Four 12 bit ADCs (one more than Pico)
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| − | ** Two I2C ports (one on the QT connector, one on the breakout pads)
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| − | ** SPI and UART peripherals, in standard QT Py locations,
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| − | ** PWM outputs on every IO pin - for servos, LEDs, etc
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| − | ** There are 6 GPIO in consecutive order for PIO compatibility
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| − | * 3.3V logic and power 600 mA
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| − | * Both Reset button and Bootloader select buttons for quick restarts (no unplugging-replugging to relaunch code)
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| − | | |
| − | === Links ===
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| − | | |
| − | * [https://circuitpython.org/board/qtpy_m0/ Adafruit QT Py page]
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| − | * [https://learn.adafruit.com/adafruit-qt-py Adafruit Learning System for QT Py]
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| − | | |
| − | == Pins ==
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| − | | |
| − | === 3V ===
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| − | | |
| − | * Regulated output from the onboard regulator. You can draw 500mA
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| − | | |
| − | === 5V ===
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| − | | |
| − | * 5v out from the USB port.
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| − | * Voltage input
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| − | ** Requires external diode
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| − | *** Schottky, signal, power
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| − | *** Between external power source and this pin
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| − | *** Cannot power the USB port by supplying 5V to this pin
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| − | **** There is a protection diode that prevents the 5V from reaching the USB connector.
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| − | **** This is to protect host computer USB ports, etc.
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| − | | |
| − | === A0 / D0 - Digital/analog GPIO pin 0 ===
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| − | | |
| − | * Digital I/O 0
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| − | * True analog output with 10 bit precision
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| − | * Does not have PWM
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| − | * Capacitive touch input.
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| − | | |
| − | === A1 / D1 - Digital/analog GPIO pin 1 ===
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| − | | |
| − | * Digital I/O 1
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| − | * Capacitive touch input
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| − | * AREF pin.
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| − | | |
| − | === A2 / D2 - Digital/analog GPIO pin 2 ===
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| − | | |
| − | * Digital I/O 2
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| − | * PWM
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| − | * Capacitive touch input.
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| − | | |
| − | === A3 / D3 - Digital/analog GPIO pin 3 ===
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| − | | |
| − | * Digital I/O 3
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| − | * PWM output
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| − | * Capacitive touch input.
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| − | | |
| − | === SDA / D4 ===
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| − | | |
| − | * Digital I/O 4
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| − | * I2C SDA pin
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| − | * PWM output
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| − | * No analog on this pin
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| − | * No pull up on this pin
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| − | * When using with I2C requires an external 2.2K-10K pullup to 3.3V.
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| − | | |
| − | === SCL / D5 ===
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| − | | |
| − | * Digital I/O 5
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| − | * I2C SCL
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| − | * No analog on this pin
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| − | * No pull up on this pin
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| − | * When using with I2C requires an external 2.2K-10K pullup to 3.3V.
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| − | | |
| − | === TX / A6 / D6 ===
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| − | | |
| − | * Digital I/O 6
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| − | * Transmit (output) for Serial1
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| − | * Analog 6
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| − | * PWM output
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| − | * Capacitive touch input
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| − | | |
| − | === RX / A7 / D7 ===
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| − | | |
| − | * Digital I/O 7
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| − | * Receive (input) for Serial1
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| − | * Analog 7
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| − | * PWM output
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| − | * Capacitive touch input
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| − | | |
| − | === SCK / A8 / D8 ===
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| − | | |
| − | * Digital I/O 8
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| − | * SPI SCK pin
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| − | * Analog 8
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| − | * PWM output
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| − | | |
| − | === MISO / A9 / D9 ===
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| − | | |
| − | * Digital I/O 8
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| − | * SPI MISO pin
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| − | * Analog 8
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| − | * PWM output
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| − | | |
| − | === MOSI / A10 / D10 ===
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| − | | |
| − | * Digital I/O 10
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| − | * SPI MOSI pin
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| − | * Analog 10
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| − | * PWM output
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| − | | |
| − | === NeoPixel ===
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| − | | |
| − | * Connected to digital pin 11 for signal
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| − | * Set pin 12 low for low power usage
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| − | * By default pin 12 is set high by Arduino/CircuitPython
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| − | | |
| − | == Programming ==
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| − | | |
| − | * C/C++ or CircuitPython
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| − | | |
| − | === C/C++ ===
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| − | | |
| − | * [https://github.com/raspberrypi/pico-sdk RP2040 C/C++ SDK]
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| − | | |
| − | === MicroPython ===
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| − | | |
| − | * [https://github.com/micropython/micropython/tree/master/ports/rp2 RP2040 MicroPython Repo]
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| − | | |
| − | === CircuitPython ===
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| − | | |
| − | * Adafruit CircuitPython 6.1.0 on 2021-01-21; Adafruit QT Py M0 Haxpress with samd21e18
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| − | * [https://circuitpython.readthedocs.io/en/latest/README.html CircuitPython] is a derivative of MicroPython.
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| − | ** [https://circuitpython.org/board/qtpy_m0_haxpress/ QT Py Haxpress] used with 2MB Flash EEPROM
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| − | * [https://github.com/adafruit/Adafruit_Learning_System_Guides/blob/master/Welcome_to_CircuitPython/QT_Py_blink.py blink.py for QT Py]
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| − | * [https://codewith.mu/ Mu editor]
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| − | * CircuitPython looks for a code file on the board to run
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| − | ** There are four options: code.txt, code.py, main.txt and main.py
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| − | ** CircuitPython looks for those files, in that order, and then runs the first one it finds
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| − | * How do I check how much memory I have free?
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| − | <pre>
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| − | import gc
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| − | gc.mem_free()
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| − | </pre>
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| − | * Reports about 19KB of free space
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| − | | |
| − | Will give you the number of bytes available for use.
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| − | | |
| − | ==== Land Boards Python Code ====
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| | | | |
| − | * [https://github.com/land-boards/lb-boards/tree/master/Projects/QTPy/Land%20Boards GitHub] | + | * AdaFruit and Seeed Studio have SAMD21 and RP2040 versions of the QT Py (XIAO on Seeed Studio) with the same form factor |
| | + | ** [[QT Py (SAMD based)]] |
| | + | ** [[QT Py (RP2040 based)]] |
| | + | * [[QTPy49|QTPy49 Breakout card]] |
| | | | |
| − | ==== Digital I/O Example ==== | + | == RP2040 vs SAM version == |
| | | | |
| − | <pre>
| + | * RP2040 is faster (125 MHz vs 48 MHz) |
| − | import board
| + | * RP2040 has 2 cores vs 1 |
| − | import digitalio
| + | * RP2040 has more Flash |
| − | import time
| + | * RP2040 has more SRAM |
| | + | * The RP2040 version is more expensive, but about the same cost if the SAM version is used with an external Flash |
| | + | * [https://www.seeedstudio.com/blog/2020/01/09/samd21-arduino-boards-which-one-should-you-use/ SAMD21/RP2040 Arduino Boards – Which 32-bit Microcontrollers should you use?] |
| | | | |
| − | led = digitalio.DigitalInOut(board.D13)
| + | [[file:XIAO_SAM_vs_XIAO_RP2040.PNG]] |
| − | led.direction = digitalio.Direction.OUTPUT
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| | | | |
| − | while True:
| + | == QTPy49 Breakout Card == |
| − | led.value = True
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| − | time.sleep(0.1)
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| − | led.value = False
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| − | time.sleep(0.5)
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| − | </pre>
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| | | | |
| − | == Flash EEPROM 2 MB ==
| + | * [[QTPy49]] |
| | | | |
| − | [[File:QT_Py_4600-07.jpg]] | + | [[file:QTPy49-P18253-720pxV.jpg]] |
