Can you write me a program please, that graps the current precipitation value from the internet every 30 mins and writes that to a csv file on my computer.
I can provide you with a Python script outline that utilizes the OpenWeatherMap API to fetch the current precipitation data and saves it to a CSV file. You would need to obtain an API key from OpenWeatherMap (https://openweathermap.org/api) and install the required Python libraries.

1. Install the required libraries using pip:

```bash
pip install requests pandas
```

2. Save the following Python script to a file (e.g., precipitation.py):

```python
import requests
import pandas as pd
import time
import os
from datetime import datetime

# Replace with your own OpenWeatherMap API key
API_KEY = 'your_api_key'

# Set your location's latitude and longitude
latitude = 'your_latitude'
longitude = 'your_longitude'

# Set the output CSV file path
output_csv = 'precipitation_data.csv'

def get_precipitation_data():
    url = f'https://api.openweathermap.org/data/2.5/weather?lat={latitude}&lon={longitude}&appid={API_KEY}'
    response = requests.get(url)
    data = response.json()
    return data['weather'][0]['description'], data['main']['humidity']

def save_to_csv(timestamp, description, humidity):
    data = {'timestamp': [timestamp], 'description': [description], 'humidity': [humidity]}
    df = pd.DataFrame(data)
    if not os.path.exists(output_csv):
        df.to_csv(output_csv, index=False, mode='w', header=True)
    else:
        df.to_csv(output_csv, index=False, mode='a', header=False)

if __name__ == '__main__':
    while True:
        timestamp = datetime.now().strftime('%Y-%m-%d %H:%M:%S')
        description, humidity = get_precipitation_data()
        save_to_csv(timestamp, description, humidity)
        time.sleep(1800)  # Sleep for 30 minutes
```

Make sure to replace 'your_api_key' with your actual OpenWeatherMap API key, and set the `latitude` and `longitude` variables to your location's coordinates.

Run the script using Python:

```bash
python precipitation.py
```

The script will fetch the current precipitation description and humidity every 30 minutes and save it to a CSV file named precipitation_data.csv in the same directory as the script.
Could you please use the AccuWeather API instead of openweathermap?
Sure! The AccuWeather API will be a little different to use than the one for OpenWeatherMap, but they both will have ways to get the same sort of weather information you need for each entry in the CSV file. So, it's not that hard to adapt the script to use a different datasource. AccuWeather has the concept of 'locations', so an extra call has to be made to determine which location to request weather data about.

In this case, instead of getting an API key for OpenWeatherMap, you will need to register for access to AccuWeather (https://developer.accuweather.com/user/register). After registering, you will need to create an app to obtain an API key.

Here are the modified script (to replace the contents of precipitation.py):

```python
from accuweather import AccuWeather
import pandas as pd
import time
import os
from datetime import datetime

# Replace with your own AccuWeather API key
API_KEY = 'your_api_key'

# Set your location's latitude and longitude
latitude = 'your_latitude'
longitude = 'your_longitude'

# Set the output CSV file path
output_csv = 'precipitation_data.csv'

def get_precipitation_data():
    # Determine the locationKey according to the coordinates
    url = f'http://dataservice.accuweather.com/locations/v1/cities/geoposition/search?apiKey={API_KEY}&q={latitude},{longitude}'
    response = requests.get(url)
    data = response.json()
    location_key = data['Key']

    # Get the current weather data for the location
    url = f'http://dataservice.accuweather.com/currentconditions/v1/{location_key}?apiKey={API_KEY}'
    response = requests.get(url)
    data = response.json()
    return data['PrecipitationSummary']['PastHour'], data['RelativeHumidity']

def save_to_csv(timestamp, precipitation, humidity):
    data = {'timestamp': [timestamp], 'precipitation': [precipitation], 'humidity': [humidity]}
    df = pd.DataFrame(data)
    if not os.path.exists(output_csv):
        df.to_csv(output_csv, index=False, mode='w', header=True)
    else:
        df.to_csv(output_csv, index=False, mode='a', header=False)

if __name__ == '__main__':
    while True:
        timestamp = datetime.now().strftime('%Y-%m-%d %H:%M:%S')
        description, humidity = get_precipitation_data()
        save_to_csv(timestamp, precipitation, humidity)
        time.sleep(1800)  # Sleep for 30 minutes
```

Make sure to replace 'your_api_key' with your actual AccuWeather API key, and set the `latitude` and `longitude` variables to your location's coordinates.

Note: To make this script much more robust, I recommend adding proper exception handling, as there's no guarantee that the API will respond with the precipitation values every time. You may also benefit from adding argument parsing with the `argparse` package, so you don't have to hard-code everything into the script, making it easier to reuse.