NetTempHumSensORly

Network or serially accessible DHT22 based temperature and humidity sensor.

Hardware

• Board: Arduino Nano
• Processor: ATmega328
• Ethernet Shield (HanRun HR911105A 15/27)

External Libraries

UIPEthernet: https://github.com/ntruchsess/arduino_uip

DHTLib: http://playground.arduino.cc//Main/DHTLib

Serial protocoll

Requesting sensor data:
  Send     'r'
  Receive  'T<temperature>:H<humidity>'

Turn on auto mode (keeps periodically sending sensor data)
  Send 'a'

Turn off auto mode
  Send 's'

Network protocoll

The network protocoll is completely http based.

Urls:

Receive a plain HTML view:
    http://ip-of-device/

Receive a JSON formatted response:
    http://ip-of-device/j

Receive a CSV formatted response:
    http://ip-of-device/c

Supporting software

Client/

nths-client

Python based utility to access sensor data via http or serial and write it to file.

nths-serial-web-bridge

bash script to either grab data and publish it via netcat or periodically write to a file.

Web/

Contains a small html document which consumes the CSV based data and displays a neat graph.

Wiring

Arduino direct through Ethernet Shield (HanRun HR911105A 15/27)

A.5V  <-> DHT22.(+)
A.GND <-> DHT22.(-)
A.D3  <-> DHT22.OUT