m5stack

README.md

これが原稿です。

この章ではmicropythonでWifiスキャナーを作ります。周りの2.4GHz帯のWifiリストを出しつつ、電波強度を音の高さで表すことができます。

micropythonのファームウェアを焼く

ampy, screenでデバッグする

wifi.scanの結果を出力する

network.scan()で取れる値は ssid,bssid,channel,RSSI,auth_method,hiddenの6要素がtupleで入ってます。

音を出す

Timer already use

表示処理とスキャン処理をスレッドに切り分ける

main.py

from m5stack import *
import network
import time
import _thread

class WifiList:
    def __init__(self, fontHeight):
        self.access_points = []
        self.cursor = 0
        self.fontHeight = fontHeight

    def scan(self, wifi):
        self.access_points = wifi.scan()

        if self.cursor >= len(self.access_points):
            self.cursor = len(self.access_points)

    def move_cursor(self):
        color = lcd.WHITE
        if hasattr(self, 'target') and wifi_list.target is not None and self.target[0] == self.access_points[self.cursor][0]:
            color = lcd.RED
            lcd.text(0, self.cursor * self.fontHeight, self._access_point_format(self.access_points[self.cursor]), color)

        self.cursor = self.cursor + 1
        if self.cursor >= len(self.access_points):
            self.cursor = 0
            lcd.text(0, self.cursor * self.fontHeight, self._access_point_format(self.access_points[self.cursor]), lcd.YELLOW)

    def subscribe(self):
        self.target = self.access_points[self.cursor]
        return self.target
    
    def cancel(self):
        self.target = None

    def show_list(self):
        lcd.setCursor(0, 0)
        lcd.clear(0xEEEEEE)

        for index, sta in enumerate(self.access_points):
            color = lcd.WHITE
            if hasattr(self, 'target') and wifi_list.target is not None and self.target[0] == sta[0]:
                color = lcd.RED
            elif self.cursor == index:
                color = lcd.YELLOW
            lcd.text(lcd.LASTX,lcd.LASTY, self._access_point_format(sta), color)

    def _access_point_format(self, sta):
        return "{0}: {1}:{2}-{3}\r\n".format(sta[0].decode('UTF-8'), sta[3],sta[4],sta[5])

def on_wasAPressed():
    wifi_list.move_cursor()

def on_wasBPressed():
    wifi_list.subscribe()

def scan_wifi():
    while True:
        wifi_list.scan(wifi)
        wifi_list.show_list()
    
        time.sleep_ms(30)

buttonA.wasPressed(on_wasAPressed)
buttonB.wasPressed(on_wasBPressed)

lcd.setCursor(0, 0)
lcd.setColor(lcd.BLACK)
lcd.clear(lcd.BLACK)
fw, fh = lcd.fontSize()
speaker.volume(1)

lcd.text(0,0,'initialize wifi..')
wifi = network.WLAN(network.STA_IF)
wifi.active(True)
wifi_list = WifiList(fh)
wifi_list.scan(wifi)
wifi_list.show_list()

def main():
    while True:
        if hasattr(wifi_list, 'target') and wifi_list.target is not None:
            target_access_point = wifi_list.target
            if buttonC.isPressed():
                wifi_list.cancel()
            
            rssi = list(filter(lambda s: s[0] == target_access_point[0], wifi_list.access_points))[0][3]
            if rssi in range(0,-30,-1):
                freq = 6600
            elif rssi in range(-30,-40,-1):
                freq = 5500
            elif rssi in range(-40,-50,-1):
                freq = 4400
            elif rssi in range(-50,-67,-1):
                freq = 3300
            elif rssi in range(-68,-70,-1):
                freq = 2200
            elif rssi in range (-71,-80,-1):
                freq = 1100
            elif rssi in range (-81,-90,-1):
                freq = 800
            else:
                freq = 100
            
            # speaker.tone(freq,20)

            time.sleep_ms(100)

main_id = _thread.start_new_thread('main', main,())
_thread.start_new_thread('scan_wifi', scan_wifi, ())