QTPy49

Features

• CPU choices are
  • QT Py (SAMD based)
    • Adafruit QT Py SAMD21 Product Page
    • Seeeduino XIAO
    • 48 MHz
  • QT Py (RP2040 based)
    • Adafruit QT Py RP2040 Product page
    • Seeed XIAO RP2040 Product page
    • 133 MHz
  • XIAO ESP32C3
    • SeeedStudio XIAO ESP32C3 (New 2022-07)
    • RISC-V Single Core
    • Up to 160 MHz
    • 400 KB SRAM
    • 4 MB Flash
    • 2.4GHz Wi-Fi subsystem
    • Wiki
    • ESP32C3 Datasheet
• Connectors/Headers
  • DC Power
  • AD0 GVS
  • AD1 GVS
  • AD2 GVS
  • AD3 GVS
  • I2C with ground/VCC
  • TX/RX with ground/VCC
  • SPI with ground/VCC
• QTPy49 can be powered from with either the USB C or DC jack
  • Automatic Schottky diode power switching between
    • 5V from USB C
    • 5V on external DC jack
    • 7-12V on DC jack
• 49x49mm ODAS form factor
• (4) 4-40 mounting holes

CPU Pinouts

Adafruit QT Py SAMD

Seeed Studio XAIO SAMD

Adafruit QT Py RP2040

Seeed Studio XAIO RP2040

Connectors/Headers

• Ground, Voltage, Signal (GVS) connections

J1 - DC In

• QTPy49 can be powered from either the USB C or DC jack
  • Automatic Schottky diode power switching
    • Can use a regular Silicon Diode with sufficient current ex: 1N400X)
  • 7-12V if regulator is installed
  • 5V if regulator is not installed (install J2 jumper if not using regulator)
• Center positive

J2 - Short Regulator

• Install if J1 has 5V
• No need to install U2 regulator

J3 - SPI

1. GND
2. 3.3V
3. SS, AD3 (wired to J6-3)
4. MOSI, S10
5. MISO, D9
6. SCK, D8

J3 - SD Card

• MISO - AD9
  • GP4 on XIAO-RP2040 and SeeedStudio RP2040
  • PA09 on Adafruit SAMD21
• MOSI - AD10
  • GP3 on XIAO-RP2040 and SeeedStudio RP2040
  • PA10 on Adafruit SAMD21
• SCK - AD8
  • GP2 on XIAO-RP2040
  • GP6 on SeeedStudio RP2040
  • PA11 on Adafruit SAMD21
• SS - AD0
  • GP26 on XIAO-RP2040
  • GP29 on SeeedStudio RP2040
  • PA02 on Adafruit SAMD21

J4 - UART

1. GND
2. 3.3V
3. TX, D6
4. RX, D7

• D6
  • GP0 on XIAO-RP2040
  • GP20 on Adafruit RP2040
  • PA06 on Adafruit SAMD21
• D7
  • GP1 on XIAO-RP2040
  • PA07 on Adafruit SAMD21
  • GP5 on Adafruit RP2040

J5 - I2C

1. GND
2. 3.3V
3. D4, SDA
4. D5, SCL

• D4
  • GP6 on XIAO-RP2040
  • GP24 on Adafruit RP2040
  • PA16 on Adafruit SAMD21
• D5
  • GP7 on XIAO-RP2040
  • GP25 on Adafruit RP2040
  • PA17 on Adafruit SAMD21

J6 - AD3

• Digital I/O 3
• Analog In 3
• GP29 on XIAO-RP2040
• GP24 on Adafruit RP2040
• PA05 on Adafruit SAMD21
• PWM output
• Capacitive touch input
• Pinout

1. GND
2. 3.3V
3. AD3 (wired to J3-3)

J7 - AD2

• Digital I/O 2
• Analog In 2
• GP28 on XIAO-RP2040
• GP27 on Adafruit RP2040
• PA05 on Adafruit SAMD21
• PWM
• Capacitive touch input
• Pinout

1. GND
2. 3.3V
3. AD2

J8 - AD1

• Digital I/O 1
• Analog In 1
• GP27 on XIAO-RP2040
• GP28 on Adafruit RP2040
• PA03 on Adafruit SAMD21
• Capacitive touch input
• AREF pin
• Pinout

1. GND
2. 3.3V
3. AD1

J9 - AD0

• Digital I/O 0
• Analog In 0
• GP26 on XIAO-RP2040
• GP29 on Adafruit RP2040
• PA02 on Adafruit SAMD21
• Slave Select to SD card
• True analog output with 10 bit precision
• Does not have PWM
• Capacitive touch input
• Pinout

1. GND
2. 3.3V
3. AD0

Applications

Sample applications for the QTPy49 card.

• Land Boards CircuitPython code

MMBASIC

Runs MMBASIC over USB port or RS-232 Serial port.

• MMBASIC on Small RP2040 Card - Hackaday page
• MMBASIC on XIAO RP2040
• Store program on SD card
• Runs PicoMiteV5.07.05b16.uf2
  • PicoMite MMBasic Version 5.07.05b16

XIAO RP2040 MMBASIC Pin Assignments

OPTION SERIAL CONSOLE GP1,GP0
OPTION SYSTEM SPI GP2,GP3,GP4
OPTION COLOURCODE ON
OPTION SDCARD GP26

SD Card Loader

• SD Card Loader

GPS frequency Standard

• GPS_Frequency_Standard

Pulse Generator Test Station

• PulseGen Test Station

Prototype

• Built on GRID49 card
• Breaks out QY Py pins to (2) 1x7 headers
• Power/ground distribution on 2x8 header
• Limit: Must be powered from USB C connector

Mechanicals

Assembly Sheet

• QTPy49 Rev 1 Assembly Sheet