raspberry pi (8) 模拟霍尔传感器，模拟温度传感器，声音传感器，光敏传感器

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1.模拟霍尔传感器

#/usr/bin/env python3 
import RPi.GPIO as GPIO 
import PCF8591 as ADC
import time

def setup():
    ADC.setup(0x48)

def Print(x):
    if x == 0: 
        print('')
        print('*************')
        print('* No Magnet *')
        print('*************')
        print('')
    if x == 1: 
        print('')
        print('****************')
        print('* Magnet North *')
        print('****************')
        print('')
    if x == -1:
        print('')
        print('****************')
        print('* Magnet South *')
        print('****************')
        print('')

def loop(): 
    status = 0
    while True:
        res = ADC.read(0)
        print('Current intensity of magnetic field : ', res) 
        if res - 133 < 5 and res - 133 > -5:
            tmp = 0
        if res < 128:
            tmp = -1
        if res > 138:
            tmp = 1
        if tmp != status: 
            Print(tmp)
            status = tmp
        time.sleep(0.2)

if __name__ == '__main__':
    setup() 
    loop()  

2.模拟温度传感器

#!/usr/bin/env python3 
import PCF8591 as ADC
import RPi.GPIO as GPIO 
import time
import math

DO = 17
GPIO.setmode(GPIO.BCM)

def setup():
    ADC.setup(0x48)
    GPIO.setup(DO, GPIO.IN)

def Print(x):
    if x == 1: 
        print('')
        print('***********')
        print('* Better~ *')
        print('***********')
        print('')
    if x == 0: 
        print('')
        print('************')
        print('* Too Hot! *')
        print('************')
        print('')

def loop(): 
    status = 1
    tmp = 1 
    while True:
        analogVal = ADC.read(0)
        Vr = 5 * float(analogVal) / 255
        Rt = 10000 * Vr / (5 - Vr)
        temp = 1/(((math.log(Rt / 10000)) / 3950) + (1 / (273.15+25)))
        temp = temp - 273.15
        print('temperature = ', temp, 'C')

        # For a threshold, uncomment one of the code for
        # which module you use. DONOT UNCOMMENT BOTH!
        #################################################
        # 1. For Analog Temperature module(with DO)
        #tmp = GPIO.input(DO);
        #
        # 2. For Thermister module(with sig pin)
        if temp > 33:
            tmp = 0;
        elif temp < 31:
            tmp = 1;
        #################################################

        if tmp != status: 
            Print(tmp)
            status = tmp

        time.sleep(0.2)

if __name__ == '__main__':
    try:
        setup()
        loop()
    except KeyboardInterrupt:
        pass

3.声音传感器

#!/usr/bin/env python3 
import PCF8591 as ADC
import RPi.GPIO as GPIO 
import time

GPIO.setmode(GPIO.BCM)

def setup():
    ADC.setup(0x48)

def loop(): 
    count = 0
    while True:
        voiceValue = ADC.read(0)
        if voiceValue:
            print('Value:', voiceValue)
            if voiceValue < 50:
                print("Voice detected! ", count)
                count += 1
            time.sleep(0.2)

if __name__ == '__main__':
    try:    
        setup()
        loop()
    except KeyboardInterrupt: 
        pass

4.光敏传感器

#!/usr/bin/env python
import PCF8591 as ADC
import RPi.GPIO as GPIO 
import time

DO = 17
GPIO.setmode(GPIO.BCM)

def setup():
    ADC.setup(0x48)
    GPIO.setup(DO, GPIO.IN)


def loop(): 
    status = 1
    while True:
        print('Value: ', ADC.read(0))
        
        time.sleep(0.2)

if __name__ == '__main__':
    try:    
        setup()
        loop()
    except KeyboardInterrupt: 
        pass