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
1X DHT11 Temperature and Relative Humidity Sensor Module for arduino
1X DHT11 Temperature and Relative Humidity Sensor Module for arduino $3.99
End Date: Monday Jul-9-2018 22:22:12 PDT
Buy It Now for only: $3.99
New DHT11 Temperature and Relative Humidity Sensor Module for arduino
New DHT11 Temperature and Relative Humidity Sensor Module for arduino $1.09
End Date: Thursday Jul-19-2018 3:40:52 PDT
Buy It Now for only: $1.09
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: Tuesday Jul-10-2018 8:50:10 PDT
Buy It Now for only: $0.99
AM2302 DHT11 12 22 TemperatureHumidity Sensor Module Replace SHT11 15 f Arduino
AM2302 DHT11 12 22 TemperatureHumidity Sensor Module Replace SHT11 15 f Arduino $1.39
End Date: Saturday Jun-30-2018 18:11:09 PDT
Buy It Now for only: $1.39
1PCS DHT11 DHT22 AM2320 AM2302 Digital Temperature Humidity Wemos Sensor M85
1PCS DHT11 DHT22 AM2320 AM2302 Digital Temperature Humidity Wemos Sensor M85 $0.99
End Date: Friday Jul-13-2018 8:36:53 PDT
Buy It Now for only: $0.99
1pcs Arduino DHT11 Temperature and Relative Humidity Sensor Module
1pcs Arduino DHT11 Temperature and Relative Humidity Sensor Module $0.99
End Date: Monday Jul-16-2018 18:58:10 PDT
Buy It Now for only: $0.99
1X DHT11 Temperature and Relative Humidity Sensor Module for Arduino FH
1X DHT11 Temperature and Relative Humidity Sensor Module for Arduino FH $3.99
End Date: Saturday Jul-21-2018 14:33:14 PDT
Buy It Now for only: $3.99
ESP8266 ESP 01S WIFI Wireless Module + DHT11 TemperatureHumidity Shield Sensor
ESP8266 ESP 01S WIFI Wireless Module + DHT11 TemperatureHumidity Shield Sensor $1.87
End Date: Sunday Jun-24-2018 14:48:36 PDT
Buy It Now for only: $1.87
Digital TemperatureRelative Humidity Sensor DHT11 Module for Arduino
Digital TemperatureRelative Humidity Sensor DHT11 Module for Arduino $0.99
End Date: Wednesday Jul-18-2018 5:31:54 PDT
Buy It Now for only: $0.99
ESP8266 DHT11 Temperature Humidity WiFi ESP 01 01S Wireless Module Pin Adapter
ESP8266 DHT11 Temperature Humidity WiFi ESP 01 01S Wireless Module Pin Adapter $3.64
End Date: Wednesday Jun-27-2018 4:18:14 PDT
Buy It Now for only: $3.64

« 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>