1. 需要先刷入circuitpython固件，然后从adafruit绑定库中复制adafruit_hid到板子的lib目录。
2. 将下面的代码保存到板子的code.py中并退出磁盘后重新插入。
3. 再运行windows的画图软件（其它一些绘图软件也可能支持，例如PS），并切换到铅笔工具，用镊子短连GPIO16和GND，就会开始自动绘图了。

代码

# Emulate mouse to draw Chord on the computer screen! by Hari Wiguna, Jan 2021
import time
import board
import digitalio
import usb_hid
from adafruit_hid.mouse import Mouse
import math
 
class Point:
    def __init__(self, xx, yy):
        self.x = xx
        self.y = yy
 
numNodes = 7
radius = 50
nodes = []
 
origin = Point(0, 0)
pen = Point(0, 0)
 
mouse = Mouse(usb_hid.devices)
 
class code:
    def __init__(self):
        self.btn = digitalio.DigitalInOut(board.GP16)
        self.btn.direction = digitalio.Direction.INPUT
        self.btn.pull = digitalio.Pull.UP
 
        # compute points
        for i in range(numNodes):
            a = math.pi * 2 * i / numNodes
            x = origin.x + math.cos(a) * radius
            y = origin.y - math.sin(a) * radius # minus because computer screen origin is top left
            nodes.append(Point(x,y))
 
    def moveto(self,p):
        global pen
        dx = p.x - pen.x
        dy = p.y - pen.y
        mouse.move(x=int(dx), y=int(dy))
        pen = p
        time.sleep(0.005)
 
    def plotto(self,p):
        mouse.press(Mouse.LEFT_BUTTON)
        self.moveto(p)
        mouse.release_all()
 
    def main(self):
        global pen
        while True:
            if self.btn.value == False:
                pen = Point(0,0)
                for i in range(numNodes-1):
                    for j in range(i+1, numNodes):
                        self.moveto(nodes[i])
                        self.plotto(nodes[j])
 
app = code()
app.main()

这个例子来自：https://hackaday.io/project/177200-pi-pico-draws-in-ms-paint

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