You don't need to use the PrivateEyePi server for collecting sensor readings or controlling the GPIO ports. You may want to send the readings to another server or save it on your own device (like a Raspberry Pi). You can also easily switch the GPIO ports.
Here is how you do it:
1. Make sure the firmware of your sensor is 1.5 or higher. You can see the firmware version at the bottom of each of the sensor configuration pages. You can upload the latest firmware from here.
2. Connect your sensor to your WIFI network.If you don't know how to do that look here first.
Get temperature readings.
You can get the temperature from the /temp page on the sensor. For example if the ip-address of your sensor is 192.168.0.25, then type the following into a browser: http://192.268.0.25/temp).
The /temp page will return the following:
Firmware version less than 1.9.3:
3 values separated by a comma:
e.g. 23.6,NA,NA
Parameter 1 = DS18B20 temperature
Parameter 2 = DHT22 temperature
Parameter 3 = DHT22 humidity
Firmware version 1.9.3 onward support the ability to have multiple DS18B20 sensors:
DS18B20
Parameter 1 = DS18B20
Parameter 2 = Sensor Id
Parameter 3 = Temperature
DHT22
Parameter 1 = DHT22
Parameter 2 = Temperature
Parameter 3 = Humidity
Here is an example of the data returned from a WIFI sensor that has 6 DS18B20 sensors and 1 DHT22 sensor:
DB18B20, 203151 , 22.62 , DB18B20, 221466 , 22.25 , DB18B20, 203244 , 22.44 , DB18B20, 203145 , 22.81 , DB18B20, 420393 , 22.56 , DB18B20, 214213 , 22.87 , DHT22, 23.40 , 45.10
Write some Python code to fetch the temperature:
cd /home
sudo gettemp.py
Paste, or type the following code. Enter the IP-address of your sensor where it is highlighted in red.
import urllib2
str_data=urllib2.urlopen("http://192.168.0.25/temp").read()
list_data = str_data.split(",")
print "Parameter 1 ="+list_data[0]
print "Parameter 2 ="+list_data[1]
print "Parameter 3 ="+list_data[2]
Press Ctrl-X followed by Y to save
Now run the program by typing:
python gettemp.py
In this example I have 6 DS18B20 sensors and 1 DHT22 sensor. It will print something like this:
Parameter 0=DS18B20
Parameter 1=203151
Parameter 2=22.69
Parameter 3=DS18B20
Parameter 4=221466
Parameter 5=22.31
Parameter 6=DS18B20
Parameter 7=203244
Parameter 8=22.44
Parameter 9=DS18B20
Parameter 10=203145
Parameter 11=22.87
Parameter 12=DS18B20
Parameter 13=420393
Parameter 14=22.62
Parameter 15=DS18B20
Parameter 16=214213
Parameter 17=22.94
Parameter 18=DHT22
Parameter 19=23.50
Parameter 20=44.90
You can change the readings between Celsius or Fahrenheit using the configuration setting on the Config menu of the sensor.
Web Page Addresses of the WIFI Sensor
You may be interested in knowing the various paths to each of the WIFI sensor we pages.
http://192.168.4.1/ - Login Details screen
http://192.168.4.1/config - Config screen
http://192.168.4.1/log" - Log screen
http://192.168.4.1/clearlog - Clear log
http://192.168.4.1/temp - Screen that outputs only temperature and humidity
Only available from version 1.9.3 and above.
