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Page 100

import io

fdr = io.open("/sys/bus/iio/devices/iio:device0/name", "rb", buffering=0)
name = fdr.readline().decode("utf-8")
print("name=", name)
fdr.close()

fdr = io.open("/sys/bus/iio/devices/iio:device0/in_temp_input",  "rb", buffering=0)
temp = fdr.readline().decode("utf-8")
print("temp=", int(temp)/1000, "C")
fdr.close()

fdr = io.open("/ sys/bus/iio/devices/iio: device0 /in_humidityrelative_input", "rb", buffering=0)
hum = fdr.readline().decode("utf-8")
print("Humidity=", int(hum)/1000, "%")
fdr.close()

Page 102

import subprocess
import io
import fcntl


def checkDht11():
    indicator = "dht11  gpiopin=4"
    command = ["sudo", "dtoverlay", "dht11", "gpiopin=4"]
    temp = subprocess.Popen(["sudo", "dtparam", "-l"], stdout=subprocess.PIPE)
    output = str(temp.communicate())
    print(output)
    if output.find(indicator) == -1:
        temp = subprocess.Popen(command, stdout=subprocess.PIPE)
        output = str(temp.communicate())
        print(output)
    return


checkDht11()

fdr = io.open("/sys/bus/iio/devices/iio:device0/name", "rb", buffering=0)
name = fdr.readline().decode("utf-8")
print("name=", name)
fdr.close()

fdr = io.open("/sys/bus/iio/devices/iio:device0/in_temp_input",  "rb", buffering=0)
temp = fdr.readline().decode("utf-8")
print("temp=", int(temp)/1000, "C")
fdr.close()

fdr = io.open( "/sys/bus/iio/devices/iio:device0/in_humidityrelative_input", "rb", buffering=0)
hum = fdr.readline().decode("utf-8")
print("Humidity=", int(hum)/1000, "%")
fdr.close()