In this example, you'll use the OpenWeatherMap API to receive and parse a JSON feed of your location's weather.
You'll need to register for an account with OpenWeatherMap and get your API key. Go to this link and register for a free account. Once registered, you'll get an email containing your API key. This key will be added to your settings.toml file as the 'openweather_token'.
Code the JSON Feed Test
Once you've finished setting up your Pico W with CircuitPython, you can access the code and necessary libraries by downloading the Project Bundle.
To do this, click on the Download Project Bundle button in the window below. It will download as a zipped folder.
# SPDX-FileCopyrightText: 2022 Liz Clark for Adafruit Industries
#
# SPDX-License-Identifier: MIT
import time
import os
import ssl
import wifi
import socketpool
import microcontroller
import adafruit_requests
wifi.radio.connect(os.getenv('CIRCUITPY_WIFI_SSID'), os.getenv('CIRCUITPY_WIFI_PASSWORD'))
# Use cityname, country code where countrycode is ISO3166 format.
# E.g. "New York, US" or "London, GB"
location = "Manhattan, US"
# openweathermap URL, brings in your location & your token
url = "http://api.openweathermap.org/data/2.5/weather?q="+location
url += "&appid="+os.getenv('openweather_token')
pool = socketpool.SocketPool(wifi.radio)
requests = adafruit_requests.Session(pool, ssl.create_default_context())
while True:
try:
# pings openweather
response = requests.get(url)
# packs the response into a JSON
response_as_json = response.json()
print()
# prints the entire JSON
print(response_as_json)
# gets location name
place = response_as_json['name']
# gets weather type (clouds, sun, etc)
weather = response_as_json['weather'][0]['main']
# gets humidity %
humidity = response_as_json['main']['humidity']
# gets air pressure in hPa
pressure = response_as_json['main']['pressure']
# gets temp in kelvin
temperature = response_as_json['main']['temp']
# converts temp from kelvin to F
converted_temp = (temperature - 273.15) * 9/5 + 32
# converts temp from kelvin to C
# converted_temp = temperature - 273.15
# prints out weather data formatted nicely as pulled from JSON
print()
print("The current weather in %s is:" % place)
print(weather)
print("%s°F" % converted_temp)
print("%s%% Humidity" % humidity)
print("%s hPa" % pressure)
# delay for 5 minutes
time.sleep(300)
# pylint: disable=broad-except
except Exception as e:
print("Error:\n", str(e))
print("Resetting microcontroller in 10 seconds")
time.sleep(10)
microcontroller.reset()
Upload the Code and Libraries to the Pico W
After downloading the Project Bundle, plug your Pico W into the computer's USB port with a known good USB data+power cable. You should see a new flash drive appear in the computer's File Explorer or Finder (depending on your operating system) called CIRCUITPY. Unzip the folder and copy the following items to the Pico W's CIRCUITPY drive.
- lib folder
- code.py
Your Pico W CIRCUITPY drive should look like this after copying the lib folder and the code.py file.
Add Your settings.toml File
Remember to add your settings.toml file as described in the Create Your settings.toml File page earlier in the guide. You'll need to include your WIFI_SSID, WIFI_PASSWORD and openweather_token in the file.
CIRCUITPY_WIFI_SSID = "your-ssid-here" CIRCUITPY_WIFI_PASSWORD = "your-ssid-password-here" openweather_token = "your-openweather-token-here"
Run code.py
Once everything is saved to the CIRCUITPY drive, connect to the serial console to see the data printed out!
The code makes a request to the OpenWeatherMap API and receives a JSON feed of your location's weather. That JSON output is printed to the REPL. Then, the location, weather, humidity, pressure and temperature converted to Fahrenheit is printed to the REPL. This call is repeated every five minutes.
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