Adafruit sensors

cascafico

Hi All!

Does anyone have experience in reading DHT11/22 sensors? I tried installing python libraries from Adafruit designed for RPI and Beaglebone platforms without success: running Adafruit-DHT.py raises errors accessing GPIO (line 90 read, line 77 read_retry)

yh75847584

just come here to see the answers




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nopnop2002

I confirmed the source code.
I think that adafruit/Adafruit_Python_DHT don't works.

There is such code.

def pi_version():
    """Detect the version of the Raspberry Pi.  Returns either 1, 2 or
    None depending on if it's a Raspberry Pi 1 (model A, B, A+, B+),
    Raspberry Pi 2 (model B+), or not a Raspberry Pi.
    """
    # Check /proc/cpuinfo for the Hardware field value.
    # 2708 is pi 1
    # 2709 is pi 2
    # Anything else is not a pi.
    with open('/proc/cpuinfo', 'r') as infile:
        cpuinfo = infile.read()
    # Match a line like 'Hardware   : BCM2709'
    match = re.search('^Hardware\s+:\s+(\w+)$', cpuinfo,
                      flags=re.MULTILINE | re.IGNORECASE)
    if not match:
        # Couldn't find the hardware, assume it isn't a pi.
        return None
    if match.group(1) == 'BCM2708':
        # Pi 1
        return 1
    elif match.group(1) == 'BCM2709':
        # Pi 2
        return 2
    else:
        # Something else, not a pi.
        return None

pi@raspberrypi:~ $ cat /proc/cpuinfo | grep Hard
Hardware        : BCM2708

orangepi@OrangePI:~$ cat /proc/cpuinfo | grep Hard
Hardware        : sun8i

rom3

Hi,
I have pluged 2 DHT11 sensors in the Orange Pi PC. The values are read out by a c-program.

https://github.com/ook/dht11-json

You must install WiringOP

https://github.com/zhaolei/WiringOP

and then you are able to compile the source with the command

cc -o bin/dht11 dht11.c -L/usr/local/lib -lwiringPi

In the c-listing line 16 (#define DHTPIN        7) you can set your IO-port. I this case is it IO-7.