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 https://technotip.com/6086/c-programming-beginner-to-advance-to-expert/

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4 Stage Timer With DS3231RTC Module.

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Micropython code from machine import Pin #importing Pin Class from machine module. import utime #importing time module led=Pin(15,Pin.OUT)  #created an led object and assigning the GPIOPin 15 to as an OUTPUT button=Pin(16,Pin.IN,Pin.PULL_DOWN) #created an object button and assigned to GPIO Pin 16 as an INPUT PULL_DOWN. def led_toggle(irq): #created a function led_toggle.     global led     led.toggle()       button.irq(trigger=Pin.IRQ_RISING,handler=led_toggle)  
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