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Pollin Net-IO PHP Library

Currently I work on a small private home-automation project. The purpose to "control" the heating system at home (heat-pump system) via the Internet. 

Okay, "control" is a too big word for the heat-pump as it has only 3 controlable modes, at least without reverse-engineering effort: "normal", "off" and "night reduction" by an external analog input. The goal is to shift energy consumption to the lower priced off-peak times.

For this project, I'm using a Ethernet Board with an Atmel AVR microcontroller, my Thecus N2100 as control server and PHP.

So it makes sense to build a small PHP library, and maybe someone else has also use of this library.

The library is compatible with the original firmware and supportsthe following main functions:

• Connecting to the network
• Setting the digital outputs and reading back the status (with the possiblity to cache the results)
• Reading the digital inputs (with the possiblity to cache the results)
• Reading the analog (ADC) inputs .

Download the code

Here's the library:  http://frost.de/files/net_io.txt (make sure to change the extension to .php)

And here are some testcases, also illustrating the usage:  http://frost.de/files/net_io_testcases.txt (make sure to change the extension to .php)

Usage snippets

Instanciating (NB: 10.243.48.250 is the IP I use on my network. You might need to change this. Factory-Default is 192.168.0.90):

$p = new pollin_netio("10.243.48.250");

Setting an Output (example: Port 0 to high, 5V) - note Port 0 is Port 1 as on the hardware schematic.

if ( false == $p->setport(0,1)) {
        echo "ERROR on setting port 1\r\n";
    } else  {
        echo " OK setting port 0\r\n";
    }
}

 Reading the input IO (eg. input 1)

$port = $p->query(8, false);

Reading analog values

for ( $i=0; $i<4; $i++) {
    $result = $p->queryad($i,0);
    if ( false == $result) {
        echo "ERROR reading port $i\r\n";
    } else  {
        echo "OK reading port $i (value $result)\r\n";
    }
}