#!/usr/bin/env python3

import RPi.GPIO as GPIO
import adafruit_dht
import time
from datetime import datetime


def get_sensor_data(dht22):
    try:
        temperature = 9./5. * dht22.temperature + 32.
        humidity = dht22.humidity
        return temperature, humidity
    except RuntimeError as e:
        print("Reading from DHT failure: ", e.args)
        return None    

if __name__ == "__main__":

    # Setup for Hardware
    DHT22_PIN = 4
    dht_device = adafruit_dht.DHT22(4)
    file = '/home/pi/code/garden/dht22/log.csv'
    
    with open(file,'a') as f:

        try:
            while True:
                data = get_sensor_data(dht22=dht_device)
                if data:
                    temperature, humidity = get_sensor_data(dht22=dht_device)
                    current_time = datetime.now().strftime("%D %H:%M:%S")
                    print(f'{humidity:.2f}%    {temperature:.2f}degF')
                    f.write(f'{current_time},{humidity:.2f},{temperature:.2f}\n') 
                    time.sleep(14.9)
                else:
                    time.sleep(0.1)

        finally:
            GPIO.cleanup()