DATALOGGER
For this exercise in Sensor Workshop i decided to try the third option in the given data-logging methods:
1. Arduino -> Processing -> PHP -> Text
2. Arduino -> Processing -> PHP -> MySQL
3. Arduino -> Xport -> PHP -> MySQL
Sending the byte value from the Arduino through the Lantronics XPort
where it calls upon a php script to write the incoming values and time stamp into a mySQL table on the itp server. Through much trial and error due o lack of experience with mySQL and php, i managed to get this. But half way though, and in the midst of WTF!!!, i did the first option – just in case. Here’s a screen shot of the data stored from a potentiometer.

I had worked with the XPort before, though not in conjunction with php and mySQL. The starting point in the code was taken from here.
My first mySQL setup, ever:

Ardunio was calling the server and waiting for it to respond, waiting for an ASCI “C” to be sent back to let it know that it had connected. I however did not get that message. As seen in terminal through telnet:

As yet, i do not know the reasons why….
Filed under: sensor workshop | 1 Comment
We use thepicaxe o8m as a data logger very cheap & works a treat.
Requirements Program “stamp plot light ” down load picaxe routine + picake logger board.
Picaxo8 has a A to D convert er in built we have used this on the following, voltage recorder from solar radio telescope, home built seismograph etc.
Wivscope could be useed I suspect.
It convert A to Data & sends via 9 pin DB9 plug to game port of computer.
This could be converted with a cable I think This is next project in coming winter.
One thing we found.The plot looks good on screen but when printed used heaps of toner./ink We then desided to use an intergrater circuit. This prints the plot like a line graph. Exellent Stamp plot light has programable time stamps that can be set.
If you require further info can forward all by E-mail.
Regards John Mcmanus