Raspberrypico analytic PWM

Remote control receiver interface definition （ Sticker up ）：

• The signal
• Positive pole
• Negative pole

Code （ Direct operation ）

from machine import Pin, PWM
import utime

rc = Pin(0, Pin.IN)

# On board LED The lamp 
led = PWM(Pin(25))
led.freq(200)

MAX=-1
MIN=99999

while True:
    # Wait for the low level to end , Then record the time 
    while rc.value() == 0:  # Capture the rising edge of the signal output 
        pass
    time1 = utime.ticks_us()
    
    # Wait for the high level to end , Then record the time 
    while rc.value() == 1:  # Capture the falling edge of signal end output 
        pass
    time2 = utime.ticks_us()
    
    # Wait for the low level to end , Then record the time 
    while rc.value() == 0:  # Capture the rising edge of the signal output 
        pass
    time3 = utime.ticks_us()

    period = time3 - time1
    high_time = time2 - time1
    low_time = time3 - time2
    dc = (int)(high_time * 100 / period*100)
# print("---------------------------")
# print("dc=",dc)
    utime.sleep(0.005)
    
    if dc>MAX:
        MAX=dc
        
    elif dc<MIN:
        MIN=dc
        
    
    offset=MAX-MIN
# print("MAX=",MAX)
# print("MIN=",MIN)
# print("offset=",offset)
    
    if offset!=0:
        light=(int)((dc-MIN)/offset*65535)
        # Control the onboard according to the stroke of the remote controller LED The brightness of the lamp 
        led.duty_u16(light)
        print("light=",light)

Code （ interrupt ）

Only the basic principles are written here , The specific implementation will not be repeated

# from machine Introduction in Pin, In order to control the pin later 
from machine import Pin
 
#  Configure keys 
# key = machine.Pin(id, mode, pull)
# id:PICO Pin number . Here the key is set to and GPIO0 Connected to a 
# mode: I / O mode , Yes Pin.IN( Input ) and Pin.OUT( Output ) Two kinds of . Set the input mode here 
# pull: Up and down resistance configuration , Yes None( No pull-down resistance )、Pin.PULL_UP( Pull up resistance ) and Pin.PULL_DOWN( Pull down resistance ) Three 
bt = Pin(24, Pin.IN, Pin.PULL_UP)
#  On board LED The lamp 
LED=Pin(25,Pin.OUT)

#  Handling interrupts 
def onClick(pin):
    print(pin.value())
    LED.toggle()

#  interrupt 
bt.irq(handler = onClick)