Temperature and Humidity sensor Experiment from Arduino kit and Raspberry pi using python.

The basic Circuit Diagram of the experiment: 

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Code in python to get values from sensor:

import sys

import Adafruit_DHT

# Parse command line parameters.

sensor_args = { ’11’: Adafruit_DHT.DHT11,

’22’: Adafruit_DHT.DHT22,

‘2302’: Adafruit_DHT.AM2302 }

if len(sys.argv) == 3 and sys.argv[1] in sensor_args:

sensor = sensor_args[sys.argv[1]]

pin = sys.argv[2]

else:

print(‘usage: sudo ./Adafruit_DHT.py [11|22|2302] GPIOpin#’)

print(‘example: sudo ./Adafruit_DHT.py 2302 4 – Read from an AM2302 connected to GPIO #4’)

sys.exit(1)

# Try to grab a sensor reading. Use the read_retry method which will retry up

# to 15 times to get a sensor reading (waiting 2 seconds between each retry).

humidity, temperature = Adafruit_DHT.read_retry(sensor, pin)

# Un-comment the line below to convert the temperature to Fahrenheit.

# temperature = temperature * 9/5.0 + 32

# Note that sometimes you won’t get a reading and

# the results will be null (because Linux can’t

# guarantee the timing of calls to read the sensor).

# If this happens try again!

if humidity is not None and temperature is not None:

print(‘Temp={0:0.1f}* Humidity={1:0.1f}%’.format(temperature, humidity))

else:

print(‘Failed to get reading. Try again!’)

sys.exit(1)

sudo ./AdafruitDHT.py 2302 04

Here is the output of the experiment in a video: