Code cleanup in module 5 and added some new more basic interrupt examples.

Author: ColinKerr

05_advanced/code/ButtonAndLed_OnOffInterrupt.py

@@ -0,0 +1,29 @@
+from machine import Pin
+import time
+
+led = Pin(2, Pin.OUT)
+button = Pin(13, Pin.IN, Pin.PULL_UP)
+
+counter = 0
+last_press_time = time.ticks_ms()
+
+def reverseGPIO():
+    if led.value():
+        led.value(0)
+    else:
+        led.value(1)
+
+def button_handler(pin):
+    global counter
+    global last_press_time
+    current_time = time.ticks_ms()
+    delta_time = time.ticks_diff(current_time, last_press_time)
+    if delta_time > 200:
+        counter += 1
+        print("Button pressed", counter, "times")
+        reverseGPIO()
+        last_press_time = current_time
+    else:
+        print("Skipped bounce")
+    
+button.irq(trigger=Pin.IRQ_RISING, handler=button_handler)

05_advanced/code/ButtonAndLed_OnOff_ButtonClass.py

@@ -0,0 +1,12 @@
+from button import Button
+from machine import Pin
+
+led = Pin(2, Pin.OUT)
+
+def reverseGPIO():
+    if led.value():
+        led.value(0)
+    else:
+        led.value(1)
+
+button = Button(13, reverseGPIO)

05_advanced/code/PWM_Music.py

@@ -2,7 +2,7 @@
 import time
 from MusicPlayer import *
 
-bpm = 140
+bpm = 120
 
 ms_pb = int((1000*60)//bpm)
 note_time = int(ms_pb // 4)

05_advanced/code/Ultrasonic_Ranging_Interrupt.py

@@ -0,0 +1,47 @@
+from machine import Pin, PWM
+import time
+
+
+class ultrasonic:
+    
+    def __init__(self, pinNum):
+        self.echoPin = Pin(pinNum, Pin.IN, 0)
+        self.startEcho = 0
+        self.endEcho = 0
+        self.distance = 0
+        self.lastMeasure = 0
+        self.soundVelocity=340
+        self.echoPin.irq(trigger=Pin.IRQ_RISING | Pin.IRQ_FALLING, handler=self.measure)
+
+    def measure(self, pin):
+        if pin.value():
+            self.startEcho = time.ticks_us()
+        else:
+            self.endEcho = time.ticks_us()
+            self.distance = self.calculateCM(self.startEcho, self.endEcho)
+            self.lastMeasure = self.endEcho
+            print("Distance: ", self.distance, "CM")
+
+    def calculateCM(self, start, stop):
+        ticks=time.ticks_diff(stop,start)
+        return int(ticks*self.soundVelocity//2//10000)
+
+
+trigPulse = PWM(Pin(13, Pin.OUT), freq=10, duty=1)
+us = ultrasonic(14)
+
+while True:
+    pass
+    
+    
+    
+    
+    
+    
+    
+    
+    
+    
+    
+    
+    

05_advanced/code/button.py

@@ -0,0 +1,16 @@
+from machine import Pin
+import time
+
+class Button:
+    def __init__(self, pinNum, callback):
+        self.button = Pin(pinNum, Pin.IN, Pin.PULL_UP)
+        self.callback = callback
+        self.last_press_time = time.ticks_ms()
+        self.button.irq(trigger=Pin.IRQ_RISING, handler=self.button_handler)
+
+    def button_handler(self, pin):
+        current_time = time.ticks_ms()
+        delta_time = time.ticks_diff(current_time, self.last_press_time)
+        if delta_time > 200:
+            self.callback()
+            self.last_press_time = current_time