DHT11 Humidity Sensor

DHT11 Humidity SensorRequires 4.7k Resistor

I went for a plane unmounted version

http://learn.adafruit.com/dht-humidity-sensing-on-raspberry-pi-with-gdocs-logging

I've had lots of issues reading the humidity which is why the code is so long.  It takes a parameter HumidyPin which is the pin the sensor is attached to.  I now have 2 sensors attached to the system hence why it's a parameter.  It's hard coded for a type 11 sensor

The code uses the Adafruit humidity application

def pdshumidity(HumidityPin):
    if debug:
        print("Reading Humidity")
    LoopCount=0
    if debug:
        print('Trying Humidity = loop count ' + str(LoopCount))
        print("          Starting try for Humidity")
    output = subprocess.check_output(["/home/pi/pds/Adafruit_DHT", "11", str(HumidityPin)]);
    if debug:
        print("          Finished trying Hunmidity")

    matches = re.search("Hum =\s+([0-9.]+)", output)

    if debug:
        print("          Trying to find matches")

    while (not matches):
        output = subprocess.check_output(["/home/pi/pds/Adafruit_DHT", "11", str(HumidityPin)]);
        matches = re.search("Hum =\s+([0-9.]+)", output)
        LoopCount = LoopCount+1
        if debug:
            print('     Humidity loop count ' + str(LoopCount))
        if (LoopCount > 1):
            if debug:
                print('     Humidity sleeping due to failure ' + str(LoopCount))
            time.sleep(10)
        if (LoopCount > 20):
            humidity = 0
            matches = 1
    humidity = float(matches.group(1))
    if debug:
        print("          Humidity check finished")

    return humidity
5X DHT11 Temperature and Relative Humidity Sensor Module for arduino
5X DHT11 Temperature and Relative Humidity Sensor Module for arduino $8.75
End Date: Wednesday Mar-6-2019 21:22:12 PST
Buy It Now for only: $8.75
1X DHT11 Temperature and Relative Humidity Sensor Module for arduino
1X DHT11 Temperature and Relative Humidity Sensor Module for arduino $2.95
End Date: Sunday Mar-3-2019 8:45:20 PST
Buy It Now for only: $2.95
DHT11 Temperature and Relative Humidity Sensor Module for arduino with cable
DHT11 Temperature and Relative Humidity Sensor Module for arduino with cable $0.99
End Date: Thursday Mar-7-2019 7:50:10 PST
Buy It Now for only: $0.99
Digital TemperatureRelative Humidity Sensor DHT11 Module for Arduino
Digital TemperatureRelative Humidity Sensor DHT11 Module for Arduino $0.99
End Date: Friday Mar-15-2019 5:31:54 PDT
Buy It Now for only: $0.99
DHT11 12 22 AM2302 TemperatureHumidity Sensor Module Replace Arduino SHT11 15
DHT11 12 22 AM2302 TemperatureHumidity Sensor Module Replace Arduino SHT11 15 $1.37
End Date: Saturday Mar-16-2019 8:18:55 PDT
Buy It Now for only: $1.37
DHT11 Temperature and Relative Humidity Sensor Module for arduino
DHT11 Temperature and Relative Humidity Sensor Module for arduino $3.89
End Date: Sunday Feb-24-2019 11:10:37 PST
Buy It Now for only: $3.89
5Pcs DHT11 Temperature and Relative Humidity Sensor Module for Arduino
5Pcs DHT11 Temperature and Relative Humidity Sensor Module for Arduino $8.99
End Date: Sunday Feb-24-2019 10:52:20 PST
Buy It Now for only: $8.99
ESP8266 DHT11 Temperature Humidity WiFi ESP 01 01S Wireless Module Pin Adapter
ESP8266 DHT11 Temperature Humidity WiFi ESP 01 01S Wireless Module Pin Adapter $1.72
End Date: Sunday Mar-24-2019 4:18:14 PDT
Buy It Now for only: $1.72
DHT 11 DHT11 Digital Temperature and Humidity Sensor Temperature Sensor Arduino
DHT 11 DHT11 Digital Temperature and Humidity Sensor Temperature Sensor Arduino $0.99
End Date: Wednesday Mar-13-2019 3:15:28 PDT
Buy It Now for only: $0.99
DHT11 Temperature and Relative Humidity Sensor Module for arduino
DHT11 Temperature and Relative Humidity Sensor Module for arduino $1.08
End Date: Thursday Mar-7-2019 18:38:08 PST
Buy It Now for only: $1.08

« Previous12345...910

Leave a Reply

Your email address will not be published. Required fields are marked *

You may use these HTML tags and attributes: <a href="" title=""> <abbr title=""> <acronym title=""> <b> <blockquote cite=""> <cite> <code> <del datetime=""> <em> <i> <q cite=""> <strike> <strong>