人機介面實作 – Digital Capacitive Touch Sensor(BS818A)

人機介面實作 – Digital Capacitive Touch Sensor(BS818A)

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程式列表

Python – ePy-Lite_BS818A.py

"""   ePy-Lite_BS818A.py   Capacitive Touch Sensor Module     ePy-Lite  BS818A   -----------------   GND       1  GND: Ground   3.3V      2  VCC: Module power supply – 2.2-5.5V   P4        3  SDO: Output pin for Serial Data   P5        4  CLK: Input pin for Serial Clock """   from machine import Switch  #Get button KEY library from machine import Timer, I2C,LED,Pin import utime # from BS818A import Keypad   class Keypad:   BS_KEYCODE_1 = 0x01   BS_KEYCODE_2 = 0x02   BS_KEYCODE_3 = 0x04   BS_KEYCODE_4 = 0x08   BS_KEYCODE_5 = 0x10   BS_KEYCODE_6 = 0x20   BS_KEYCODE_7 = 0x40   BS_KEYCODE_8 = 0x80   BS_Released  = 0xA0FF     def __init__(self, scl, sdo):     self._scl_pin = Pin(scl, Pin.OUT)     self._sdo_pin = Pin(sdo, Pin.IN)     self._scl_pin.on()     utime.sleep_ms(1)     def read(self):     DATA = 0       for i in range(16):       self._scl_pin.off()       utime.sleep_us(10)       self._scl_pin.on()       utime.sleep_us(10)       DATA |= self._sdo_pin.value() << i     utime.sleep_ms(6)       return DATA & 0xFFFF;     def PressBsButton(self,button):     BsKey = self.read()       if (BsKey != BS_Released):       # print(BsKey)       if ((BsKey & button) == button) :         return False  # if bit set 1 is not button pressed       else:         return True       return False    # note  frequency NOTE = [262,294,330,349,392,440,494,         523,587,659,698,784,880,988,         1046,1175,1318,1397,1568,1760,1976]   def buzzer_toggle(t):   if buzzer_pin.value() == 0:     buzzer_pin.value(1)   else :     buzzer_pin.value(0)   def tick3(timer):   global TimerDone   TimerDone = True   def key_int():   global KeyDone   KeyDone = True   # Start Function if __name__ == '__main__':   ledY = LED('ledy')   ledY.off()     KeyA = Switch('keya')    #Create button A   KeyA.callback(key_int)   KeyDone = False     timer = Timer(3,freq=20)   timer.callback(tick3)   TimerDone = False     buzzer_pin = Pin(Pin.epy.P22,Pin.OUT) #指定 P22 為 輸出, 推動buzzer     scl_pin = Pin.board.P5   sdo_pin = Pin.board.P4     keypad = Keypad(scl=scl_pin, sdo=sdo_pin)   OldKey=0xFFFF     while True:     if TimerDone == True:       TimerDone = False       pressed = keypad.read()         if (pressed != 0xFFFF)and(pressed != OldKey) :         print(hex(pressed))         OldKey = pressed           if (pressed & Keypad.BS_KEYCODE_1)==0:           KeyNum = 0         elif (pressed & Keypad.BS_KEYCODE_2)==0:           KeyNum = 1         elif (pressed & Keypad.BS_KEYCODE_3)==0:           KeyNum = 2         elif (pressed & Keypad.BS_KEYCODE_4)==0:           KeyNum = 3         elif (pressed & Keypad.BS_KEYCODE_5)==0:           KeyNum = 4         elif (pressed & Keypad.BS_KEYCODE_6)==0:           KeyNum = 5         elif (pressed & Keypad.BS_KEYCODE_7)==0:           KeyNum = 6         elif (pressed & Keypad.BS_KEYCODE_8)==0:           KeyNum = 7         tone = Timer(0,freq=(NOTE[KeyNum])*2)           tone.callback(buzzer_toggle) # 回調函數掛載 每次 500Hz 會進去回調函數         utime.sleep_ms(200)         tone.callback(None) # 關閉呼叫回調函數       elif (pressed == 0xFFFF):         OldKey =  0xFFFF       if KeyDone == True:      #Press A Key       break     KeyA.callback(None)   timer.callback(None)   timer.deinit()

執行結果

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