### ex6-1 ###

from machine import Pin
import utime

sw520d = Pin(13, Pin.IN)	# 設為讀取模式

while True:
    print(sw520d.value())	# 讀取狀態
    utime.sleep_ms(100)



### ex6-2 ###

from machine import Pin, I2C, PWM
from ssd1306 import SSD1306_I2C
import utime

sw520d = Pin(13, Pin.IN, Pin.PULL_UP)
oled = SSD1306_I2C(128, 64, I2C(scl=Pin(5), sda=Pin(4)))
buzzer = PWM(Pin(15, Pin.OUT), freq=880, duty=0)

while True:
    
    oled.fill(0)
    oled.text("Shake status:", 0, 0)
    
    # 判斷震動開關狀態
    if sw520d.value() == 1:
        buzzer.duty(512)
        oled.text("!!! TIPPED !!!", 0, 16)
        print("!!! 感測器傾倒 !!!")
        
    else:
        buzzer.duty(0)
        oled.text("- Standby -", 0, 16)
        print("感測器狀態正常")
        
    oled.show()
    utime.sleep_ms(100)



### ex6-3 ###

from machine import Pin, I2C, PWM
from ssd1306 import SSD1306_I2C
import utime

sw520d = Pin(13, Pin.IN, Pin.PULL_UP)
oled = SSD1306_I2C(128, 64, I2C(scl=Pin(5), sda=Pin(4)))
buzzer = PWM(Pin(15, Pin.OUT), freq=392, duty=0)

oled.text("Step counter", 0, 8)
oled.show()
print("計步器已啟動")

count = 0

while True:
    
    if sw520d.value() == 1:	# 震動開關晃動
    
        # 紀錄震動開關受到晃動的時間起點
        start_time = utime.ticks_ms()
    
        # 等待震動開關停止晃動 (傳回 0)
        while sw520d.value() == 1:
            pass	# 什麼事也不做，但用 pass 這句來維持迴圈結構
        
        # 如果搖晃導致狀態改變的時間間隔超過 50 毫秒，代表是正確人為搖晃，步數加 1     
        if utime.ticks_ms() - start_time > 50:
        
            count += 1
            print("步數: " + str(count))
        
            buzzer.duty(512)
    
            oled.fill(0)
            oled.text("Count:", 0, 0)
            oled.text(str(count) + " step(s)", 0, 16)
            oled.show()
            
            # OLED 本身讀寫有時間延遲，故不再加入額外延遲
            buzzer.duty(0)



### ex6-4 ###

from machine import Pin, I2C, PWM
from ssd1306 import SSD1306_I2C
import utime, urandom

sw520d = Pin(13, Pin.IN, Pin.PULL_UP)
oled = SSD1306_I2C(128, 64, I2C(scl=Pin(5), sda=Pin(4)))
buzzer = PWM(Pin(15, Pin.OUT), freq=440, duty=0)
laser = Pin(16, Pin.OUT)
laser.off()

oled.fill(0)
oled.text("Reaction test", 0, 0)
oled.text("SHAKE to start", 0, 16)
oled.show()
print("反應大考驗 - 搖晃震動開關來啟動測試")

while True:

    if sw520d.value() == 1:	# 啟動測試
        
        laser.off()

        # 倒數 3 秒，用 reversed 讓 i 從 2 減到 0  
        for i in reversed(range(3)):
            oled.fill(0)
            oled.text("Reaction test", 0, 0)
            oled.text("Ready in " + str(i + 1) + " secs", 0, 16)
            oled.show()
            print("倒數 " + str(i + 1) + " 秒...")
            buzzer.freq(440)
            buzzer.duty(512)
            utime.sleep(0.1)
            buzzer.duty(0)
            utime.sleep(0.9)

        buzzer.freq(880)
        buzzer.duty(512)
        oled.fill(0)
        oled.text("Started!", 0, 0)
        oled.text("SHAKE when laser", 0, 16)
        oled.text("turns on:", 0, 32)
        oled.show()
        print("測試開始! 在雷射光一點亮時搖晃震動開關")
        utime.sleep(0.3)
        buzzer.duty(0)
        utime.sleep(0.7)
        
        utime.sleep(3 + urandom.getrandbits(2))		# 隨機等待 3 至 6 秒

        laser.on()
        start_time = utime.ticks_ms()

        while sw520d.value() == 0:
            pass
        
	# 測到搖晃，計算反應時間
        reaction_time = (utime.ticks_ms() - start_time) / 1000
        
        # 報告結果
        oled.fill(0)
        oled.text("Reaction time:", 0, 0)
        oled.text(str(reaction_time) + " secs", 0, 16)
        oled.text("SHAKE to start", 0, 40)
        oled.text("again", 0, 54)
        oled.show()
        print("反應時間: " + str(reaction_time) + " 秒")
        print("測試結束 - 搖晃震動開關以再次測試")
        buzzer.freq(440)
        buzzer.duty(512)
        utime.sleep(0.1)
        buzzer.freq(880)
        utime.sleep(0.3)
        buzzer.duty(0)
        utime.sleep(1.6)	# 結束時停頓片刻，確定開關狀態保持靜止