Set up the Raspberry Pi

no warranty for any of the provided information

Read in the last line of the logfile as input for visualization. Instead of reading the hole file, the command line functions head and tail are used.

The parameter $NoSensors indicates the position where sensor values end and actuator values start.

<?php 
/* published under GPL www.gnu.org/licenses/gpl.html */

function HV_readOperationState($opModFile){
    include_once("readFilenames.php");
    global $debug;
    $year  = date('Y');
    $month = date('m');
    if(isset($_GET['month'])){$month=$_GET['month'];}
    $path = "./".$year."-".$month."/";
  
    if($debug){echo "<p><aj>HV_readOperationState</aj>: ".$year." ".$month." ".$path."</p>";}

    /* read logfile */
    $files = readFilenames($path,".txt");
    sort($files);
    $file = $files[count($files)-1];
    $date=substr( $file, strpos($file,"_") );
    $actFile  = $path."actuatorsLog".$date;
    $sensFile = $path."sensorsLog".$date;
    list($sensors,$timeStamp)   = lastData($sensFile);
    list($actuators,$timeStamp) = lastData($actFile);


    $operationMode = readOperationMode($opModFile);

    if($debug){
        echo "<p><aj>HV_readOperationState( )</aj></p>\n";
        print_r($sensors); echo "<br>";
        print_r($actuators); echo "<br>";
        print_r($operationMode); echo "<br>";
    }

    return array($timeStamp,$sensors,$actuators,$operationMode);
}

function readOperationMode($opModFile){
    global $debug;
  $fid = fopen($opModFile,"r");
  $opModStr = trim(fgets($fid,2048));  
  fclose($fid);
  $opModStr = substr($opModStr,1);
  $opModStr = substr($opModStr,0,strlen($opModStr)-2);
  $opModStr = str_replace("\"","",$opModStr);
  $tmp = explode(",",$opModStr);
  for($m=0;$m<count($tmp);$m++){
    $thisM = explode(":",$tmp[$m]);
    $operationMode[trim($thisM[0])] = trim($thisM[1]);
  } #m
  
    if($debug){
        echo "<p><aj>HV_readOperationMode( )</aj></p>\n";
    }
    
  return $operationMode;
}



function lastData($file){
    global $debug;
    
    if (file_exists($file)){
        /* get first line of logfile for  varNames */
        $cmd = "head -1 ".$file;
        exec($cmd,$output);
        if($debug){echo $cmd."<br>";}
        
        $varNames = explode("\t",$output[0]);
        #for($v=0;$v<count($varNames);$v++){
        #    $ColNo[$varNames[$v]] = $v;
        #} #v
    
        /* get last line of data */
        $cmd = "tail -1 ".$file;
        exec($cmd,$output);
        if($debug){echo $cmd."<br>";}
        
        $values = explode("\t",$output[1]);
        for($v=1;$v<count($varNames);$v++){
            $data[$varNames[$v]] = $values[$v];
        } #v
    
        /* timeStamp of logfile */
        $timeStamp = $values[0];
    } else {
        echo "<p>FILE ".$file." NOT FOUND</p>";
    } #fi 

    return array($data,$timeStamp);
}

?>

python

php

Der gesamte Sourcecode darf gemäß GNU General Public License weiterverbreitet werden.