cwalk / pi-temp Goto Github PK

Web server using a Raspberry Pi and DHT22 sensor to graph the humidity and temperature in my apartment over time.

Python 4.17% HTML 6.08% CSS 11.76% JavaScript 77.98%

sensor-data humidity temperature graph raspberry-pi python web-development javascript html5 css3

pi-temp's Introduction

Introduction

Web server using a Raspberry Pi and DHT22 sensor to graph the humidity and temperature in my apartment over time. The data can be accessed over a web browser.

Skills I learned during this project:

Setup the minimal Raspbian operating system to the RPi, called Minibian
Install and use Python, and the Python virtual environment
Install and use Flask, a Python-based web micro-framework
Install and use uWSGI as the application server for Flask
Install and use Nginx light-weight web server
Use Skeleton to make the web UI look better
Use the RPi GPIOs as digital input and outputs
Use a DHT22 humidity and temperature sensor
Install and use the SQLite database to store sensor data
Add a cron job to store sensor data every so many minutes
Use the Google Chart API to create visual representations of the sensor data
Use Javascript/JQuery to add interactivity to web pages
Use Plotly for graphical analysis of sensor data

Summary

The lab_app folder contains the code for the project (The html folder, button.py, and blink.py were just for testing purposes).

Inside lab_app you will find the main python server, lab_app.py. This uses a cronjob to take a temperature and humidity reading every so many minutes, and stores it in a sqlite database. The web server has 2 views, lab_temp.html and lab_env_db.html, which I refer to as current view and historic view respectively.

Current

In the current view, the current temperature and humidity taken from the sensor is displayed on the web page. This page updates every 10 seconds, and has a link to the historic view.

Historic

The historic view has a couple features. The first is a to and from date input, which uses a date time picker plugin. Combined with a submit button, this allows you to view the temperature and humidity data within any date time range easily. The next feature are four radio buttons, to easily see the last 3, 6, 12, and 24 hours of data. There are two links, one to the current view, and another to export the data to Plotly. Clicking this link will send you to plotly and show you a graph of Temperature vs Humidity.

The main view are 2 tables combined with Google Charts graphs. The tables both scroll, and the charts display data across the time selected. The times are displayed in your own time zone, as it is determined from your browser.

YouTube

YouTube: https://www.youtube.com/watch?v=hFqNiZ4p0Ss

Circuit Diagram

pi-temp's People

Contributors

Stargazers

Watchers

pi-temp's Issues

Multiple sensors

How to add multiple DHT22 sensors to this?

How to add sensor Ds18b20 ?

thanks before, sir

syntax error

With the release of the 3.0 version of Python, the print function '()' is essential.
Perhaps written in the previous version, without '()'.
I want to know the latest Python code Plz T.T

Installation instructions?

Hi, i was wondering if there is an instruction on how to install the code on raspberry pi and set everything up.
Video did not cover anything for installation.

Thanks.

error with timezones due to env_log insert using localtime not UTC

your putting the entries into the database in localtimezone not in UTC so the math is off when the data is pulled out.

you should change the values on the env_log.py file to UTC as follows

values(datetime(CURRENT_TIMESTAMP)

Traceback (most recent call last):
  File "/home/pi/Workspace/Pi-Temp/lab_app/env/bin/flask", line 11, in <module>
    sys.exit(main())
  File "/home/pi/Workspace/Pi-Temp/lab_app/env/lib/python3.5/site-packages/flask/cli.py", line 906, in main
    cli.main(args=args, prog_name=name)
  File "/home/pi/Workspace/Pi-Temp/lab_app/env/lib/python3.5/site-packages/flask/cli.py", line 569, in main
    return super(FlaskGroup, self).main(*args, **kwargs)
  File "/home/pi/Workspace/Pi-Temp/lab_app/env/lib/python3.5/site-packages/click/core.py", line 717, in main
    rv = self.invoke(ctx)
  File "/home/pi/Workspace/Pi-Temp/lab_app/env/lib/python3.5/site-packages/click/core.py", line 1137, in invoke
    return _process_result(sub_ctx.command.invoke(sub_ctx))
  File "/home/pi/Workspace/Pi-Temp/lab_app/env/lib/python3.5/site-packages/click/core.py", line 956, in invoke
    return ctx.invoke(self.callback, **ctx.params)
  File "/home/pi/Workspace/Pi-Temp/lab_app/env/lib/python3.5/site-packages/click/core.py", line 555, in invoke
    return callback(*args, **kwargs)
  File "/home/pi/Workspace/Pi-Temp/lab_app/env/lib/python3.5/site-packages/click/decorators.py", line 64, in new_func
    return ctx.invoke(f, obj, *args, **kwargs)
  File "/home/pi/Workspace/Pi-Temp/lab_app/env/lib/python3.5/site-packages/click/core.py", line 555, in invoke
    return callback(*args, **kwargs)
  File "/home/pi/Workspace/Pi-Temp/lab_app/env/lib/python3.5/site-packages/flask/cli.py", line 779, in run_command
    app = DispatchingApp(info.load_app, use_eager_loading=eager_loading)
  File "/home/pi/Workspace/Pi-Temp/lab_app/env/lib/python3.5/site-packages/flask/cli.py", line 300, in __init__
    self._load_unlocked()
  File "/home/pi/Workspace/Pi-Temp/lab_app/env/lib/python3.5/site-packages/flask/cli.py", line 324, in _load_unlocked
    self._app = rv = self.loader()
  File "/home/pi/Workspace/Pi-Temp/lab_app/env/lib/python3.5/site-packages/flask/cli.py", line 381, in load_app
    app = locate_app(self, import_name, name)
  File "/home/pi/Workspace/Pi-Temp/lab_app/env/lib/python3.5/site-packages/flask/cli.py", line 236, in locate_app
    __import__(module_name)
  File "/home/pi/Workspace/Pi-Temp/lab_app/lab_app.py", line 85
    print "rendering lab_env_db.html with: %s, %s, %s" % (timezone, from_date_str, to_date_str)
                                                     ^
SyntaxError: invalid syntax