I am using hih9000 series temperature & humidity sensor in that first 2 byte for humidity data and last 2 byte for temperature how can i decode that

Question

import smbus
import time
import datetime

#SMBus(0) - Raspberry Pi Model A
#SMBus(1) - Raspberry Pi Model B

bus = smbus.SMBus(1)

#I2C address of sensor
address = 0x27
def temp():

     #rvalue0 = bus.read_word_data(address,0)
     rvalue0= bus.read_i2c_block_data(address,1,32)
     print rvalue0
     print ('\n')
     rvalue1 = (rvalue0 & 0x0000ff00) >> 8
     print rvalue1
     print ('\n')
     rvalue2 = rvalue0 & 0x0000ff00
     print rvalue2
     rvalue = (((rvalue2 *256) + rvalue1) >> 2 ) *.007631
     print rvalue

Output:

[79, 202, 104, 29, 63, 41, 160, 116, 252, 166, 129, 211, 242, 154, 7, 79, 202, 104, 29, 63, 41, 160, 116, 252, 166, 129, 211, 242, 154, 7, 79, 202]

Error Message:

Traceback (most recent call last):
  File "/home/pi/temp1.py", line 41, in <module>
    temp()
  File "/home/pi/temp1.py", line 18, in temp
    rvalue1 = (rvalue0 & 0x0000ff00) >> 8
TypeError: unsupported operand type(s) for &: 'list' and 'int'

Answer 1

As Joan mentioned, you seem to misunderstand the return value provided by read_i2c_block_data(). According to the documentation, and your output, it returns a long[]. The & operator ands a single value. Instead of a single value, you've given it a list (containing 32) of values.

If you want to add that operation onto every member of that list, a map function is probably your best bet. I've given an example for your first operation.

def temp():
    rvalue0 = bus.read_i2c_block_data(address,1,32)
    print rvalue0
    print ('\n')
    rvalue1 = list(map((lambda x: (x & 0x0000ff00) >> 8), rvalue0))
    print rvalue1