#!/usr/bin/python
import sys
import Adafruit_DHT
import os
from munin import MuninPlugin

class DHT11Plugin(MuninPlugin):
    title = "DHT11 Temperature"
    args = "--base 1000 -l 0"
    vlabel = "degrees celcius"
    scale = False
    category = "sensors"

    @property
    def fields(self):
        warning = os.environ.get('temp_warn', 30)
        critical = os.environ.get('temp_crit', 60)
        return [("temp", dict(
                label = "Temperature",
                info = 'Temperature as reported by a DHT11 sensor',
                type = "GAUGE",
                min = "-20",
                warning = str(warning),
                critical = str(critical)))]

    def execute(self):
        pin = int(os.environ.get('dht11_pin', 2))
        humidity, temperature = Adafruit_DHT.read_retry(Adafruit_DHT.DHT11, pin)
        return dict(temp=temperature)

if __name__ == "__main__":
    DHT11Plugin().run()