https://github.com/chrisb2/environment

Monitor temperature and humidity (DHT22) using MicroPython on an ESP8266 and send the results to ThingSpeak.
https://github.com/chrisb2/environment

dht22 esp8266 micropython thingspeak wunderground-api

Last synced: 29 days ago
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Monitor temperature and humidity (DHT22) using MicroPython on an ESP8266 and send the results to ThingSpeak.

• Host: GitHub
• URL: https://github.com/chrisb2/environment
• Owner: chrisb2
• License: mit
• Created: 2017-10-22T03:11:45.000Z (over 7 years ago)
• Default Branch: master
• Last Pushed: 2017-11-09T08:15:47.000Z (about 7 years ago)
• Last Synced: 2024-11-07T21:47:38.576Z (3 months ago)
• Topics: dht22, esp8266, micropython, thingspeak, wunderground-api
• Language: Python
• Size: 23.4 KB
• Stars: 0
• Watchers: 2
• Forks: 0
• Open Issues: 0
• Metadata Files:
  • Readme: README.md
  • License: LICENSE.md

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README

        
# Environment Monitor

Monitors temperature and humidity using [MicroPython](http://micropython.org/)

on an [ESP8266](https://en.wikipedia.org/wiki/ESP8266) and a [RHT03 (DHT22)](https://cdn.sparkfun.com/datasheets/Sensors/Weather/RHT03.pdf)

sensor and sends the results to [ThingSpeak](https://thingspeak.com).

## Circuit

The following circuit diagram shows how I connected the sensor to a NodeMcu ESP8266 development board:

![Circuit diagram](https://github.com/chrisb2/environment/raw/master/environment-circuit.png "Circuit Diagram")

## Usage

Configure a ThingSpeak channel something like:

![ThingSpeak channel](https://github.com/chrisb2/environment/raw/master/thingspeak-channel-settings.png "ThingSpeak Channel Settings")

Download the [urequests](https://raw.githubusercontent.com/micropython/micropython-lib/master/urequests/urequests.py) HTTP library and create a file called _secrets.py_:

```python

"""Secret values required to connect to services."""

WIFI_SSID = 'XXXXXX'

WIFI_PASSPHRASE = 'XXXXXX'

THINGSPEAK_API_KEY = 'XXXXXX'

WUNDERGROUND_API_KEY = 'XXXXXX'

```

and copy with the rest of the python files to the ESP8266.

Run the following script from the REPL to load the wifi network.

```python

# Connect to WiFi router

import network

import secrets

wlan = network.WLAN(network.STA_IF)

wlan.active(True)

wlan.connect(secrets.WIFI_SSID, secrets.WIFI_PASSPHRASE)

wlan.ifconfig()

```

Reboot the ESP8266 to automatically run the program.