raspberry pi - DHT Sensor Python script error -


i have sensor type dht22 connected raspberry. have written script in python when run errors

#!/usr/bin/python import mysqldb import subprocess import re import sys import time import datetime import adafruit_dht  conn = mysqldb.connect("localhost","zeus","gee3g673r","logi") while(true): date = time.strftime("%d/%m/%y") clock = time.strftime("%h:%m")  #output = subprocess.check_output(["/usr/bin/adafruitdht.py 2302", "4"]); output = adafruit_dht.read_retry(adafruit_dht.am2302, 4) matches = re.search("temp =\s+([0-9.]+)", output)  if (not matches):  time.sleep(0)  continue temp = float(matches.group(1))  matches = re.search("hum =\s+([0-9.]+)", output)  if (not matches):  time.sleep(0)  continue humidity = float(matches.group(1))  # mysql data processing c = conn.cursor()  c.execute("insert data_th (date, clock, temp, hum) values (%s, %s,%s, %s)",(date, clock, temp, humidity))  #print "db loaded"  time.sleep(360)

this error encountered on running script:

root@raspberrypi:/home# ./hdt.py traceback (most recent call last): file "./dht.py", line 22, in <module> matches = re.search("temp =\s+([0-9.]+)", output) file "/usr/lib/python2.7/re.py", line 142, in search return _compile(pattern, flags).search(string) typeerror: expected string or buffer

adafruit_dht.read_retry() not return string. re.search expects string second parameter.

please have @ code below (taken adafruit_python_dht/examples):

# try grab sensor reading.  use read_retry method retry # 15 times sensor reading (waiting 2 seconds between each retry). humidity, temperature = adafruit_dht.read_retry(sensor, pin)  # un-comment line below convert temperature fahrenheit. # temperature = temperature * 9/5.0 + 32  # note won't reading , # results null (because linux can't # guarantee timing of calls read sensor).   # if happens try again! if humidity not none , temperature not none:     print 'temp={0:0.1f}*  humidity={1:0.1f}%'.format(temperature, humidity) else:     print 'failed reading. try again!'     sys.exit(1)

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