CircuitPython on Seeed Studio XIAO SAMD21¶
CircuitPython is a programming language designed to simplify experimenting and learning to program on low-cost microcontroller boards. It makes getting started easier than ever with no upfront desktop downloads needed. Once you get your board set up, open any text editor, and get started editing code. For more info, please refer to here.
Download the official CircuitPython Bootloader for Seeed Studio XIAO SAMD21. A
.uf2should be downloaded.
Plug-in the Seeed Studio XIAO SAMD21 to your PC via USB Type-C.
Entering the DFU bootloader mode by using a jumper to short connect RST Pins twice quickly. For more reference, please also see here.
- An external drive named
Arduinoshould appear in your PC. Drag the the downloaded CircuitPython uf2 files to the
- Once loaded the CircuitPython bootloader, unplug the USB Type-C and re-connect. A new external drive called
- Now, CircuitPython is loaded on Seeed Studio XIAO SAMD21! All you need to do it's to write you python program and name it
main.pyand drag it onto the
Blink using CircuitPython:
Note: simply copy and save the following code and name it
main.py, and drag it to
import time import board from digitalio import DigitalInOut, Direction led = DigitalInOut(board.LED_INVERTED) led.direction = Direction.OUTPUT while True: led.value = True time.sleep(1) led.value = False time.sleep(1)
You should see the built-in LED starts to blink!
Playing with Grove Modules¶
You can use Grove modules with simple Analog/Digital Interfaces on CircuitPython. For example, connect Grove - Light Sensor to Seeeduino XIAO's
A0 port and run the following:
import time import board from analogio import AnalogIn analog_in = AnalogIn(board.A0) # Analog pin on Seeedino XIAO def get_voltage(pin): return (pin.value * 3.3) / 65536 while True: print("Voltage: ", get_voltage(analog_in)) time.sleep(0.1)
For more CircuitPython API reference, please visit CircuitPython Essentials.
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