Stazione Meteo

Questo è il codice contenuto in uno dei tutorial del libro Python per Raspberry edito da Amazon KDP. L’utilizzo di questo codice è permesso solo ai possessori del libro Python per Raspberry. Si declina ogni responsabilità dall’uso proprio o improprio di tale codice. Tutti i diritti riservati.

#!/usr/bin/enx python
import RPi.GPIO as GPIO
import time
def bin2dec(string_num):
    return str(int(string_num, 2))
data = []
GPIO.setmode(GPIO.BCM)
GPIO.setup(4,GPIO.OUT)
GPIO.output(4,GPIO.HIGH)
time.sleep(0.025)
GPIO.output(4,GPIO.LOW)
time.sleep(0.02)
GPIO.setup(4, GPIO.IN, pull_up_down=GPIO.PUD_UP)
for i in range(0,300):
    data.append(GPIO.input(4))

bit_count = 0
tmp = 0
count = 0
HumidityBit = ""
TemperatureBit = ""
crc = ""

try:
        while data[count] == 1:
                tmp = 1
                count = count + 1

        for i in range(0, 32):
                bit_count = 0

                while data[count] == 0:
                        tmp = 1
                        count = count + 1

                while data[count] == 1:
                        bit_count = bit_count + 1
                        count = count + 1

                if bit_count > 3:
                        if i>=0 and i<8:
                                HumidityBit = HumidityBit + '1'
                        if i>=16 and i<24:
                                TemperatureBit = TemperatureBit + '1'
                else:
                        if i>=0 and i<8:
                                HumidityBit = HumidityBit + "0"
                        if i>=16 and i<24:
                                TemperatureBit = TemperatureBit + "0"
except:
        print "ERR_1"
        exit(0)

try:
        for i in range(0, 8):
                bit_count = 0

                while data[count] == 0:
                        tmp = 1
                        count = count + 1

                while data[count] == 1:
                        bit_count = bit_count + 1
                        count = count + 1

                if bit_count > 3:
                        crc = crc + '1'
                else:
                        crc = crc + '0'
except:
        print "ERR_2"
        exit(0)

Humi = bin2dec(HumidityBit)
Temp = bin2dec(TemperatureBit)

if int(Humi) + int(Temp) - int(bin2dec(crc)) == 0:
        print "Percentuale di umi:"+ Humi +" %"
        print "Temperatura:"+ Temp +" C"
else:
        print "ERR_3"
GPIO.cleanup()