Battery Stress Test

An issue with using USB power packs to power the vehicles is that you don’t know how long a battery pack will last. This test was created to constantly send movement commands to the vehicle and record how long until the battery finally runs out of power.

The dashboard gives you a button so that you can start, or pause a current test. When the page loads, or reloads a new text file is created to log the current time tracking. At the bottom of the page shows the previous test times.

So: Button = Start/Pause/Restart Current test, Open or Refresh Page = new test.

Note: Put the vehicle on a little stand, or put it in a large parking lot for test. The commands are sent completely at random.

battery-test.php

<h1>Battery Time Tester</h1> <?php $ip = $_SERVER['SERVER_ADDR']; echo "<div style='width:640; height:480; margin-left:auto; margin-right:auto;'>"; echo "<iframe src='http://".$ip.":8000' height=480 width=640></iframe>"; echo "</div>"; echo "<br>"; ?> <p>Current Test # <span id=currenttest>0</span></p> <button onclick="power()">Press to Start/ Pause Test</button> <p>Test Status: <span id="status">test</span></p> <p>Timer: <span id="timer_clock">0000</span></p> <p>Heading: <span id="heading">0000</span></p> <p>Speed: <span id="speed">0000</span></p> <h2>Previous Times</h2> <?php $logfiles = glob( "logs/" ."*.txt" ); natsort($logfiles); $logfiles = array_reverse($logfiles); $nextfilenumber = $logfiles[0]; if ($nextfilenumber == " "){ $nextfilenumber = "1"; } $nextfilenumber = trim($nextfilenumber, ".txt"); $nextfilenumber = trim($nextfilenumber, "logs/"); $nextfilenumber = $nextfilenumber+1; $filecounter = 0; foreach($logfiles as $files){ $filecounter++; if ($filecounter > 10) { unlink($files); } $uptime = file_get_contents("$files"); $uptime = $uptime / 60; $uptime = number_format($uptime, 2); $files = trim($files, ".txt"); $files = trim($files, "logs/"); echo "Test: ".$files." ---- ".$uptime." minutes"; echo "<br>"; } ?> <script> var logfilename = "<?php echo"$nextfilenumber"?>"; var on_off = "off"; document.getElementById("status").innerHTML = on_off; function power(){ if (on_off == "off"){ on_off = "on"; document.getElementById("status").innerHTML = on_off; } else if (on_off == "on"){ on_off = "off"; document.getElementById("status").innerHTML = on_off; direction = "stop"; var xmlhttp = new XMLHttpRequest(); xmlhttp.open("GET", "./controls.php?command=" + direction); xmlhttp.send(); } else { on_off = "off"; document.getElementById("status").innerHTML = on_off; direction = "stop"; var xmlhttp = new XMLHttpRequest(); xmlhttp.open("GET", "./controls.php?command=" + direction); xmlhttp.send(); } } setInterval(testTimer, 1000); var timer = 0; function testTimer(){ if (on_off == "on"){ timer++; document.getElementById("timer_clock").innerHTML = timer; random_number = Math.floor(Math.random()*10); switch(random_number){ case 0: direction = "forward"; var xmlhttp = new XMLHttpRequest(); xmlhttp.open("GET", "./controls.php?command=" + direction); xmlhttp.send(); break; case 1: direction = "backward"; var xmlhttp = new XMLHttpRequest(); xmlhttp.open("GET", "./controls.php?command=" + direction); xmlhttp.send(); break; case 2: direction = "stop"; var xmlhttp = new XMLHttpRequest(); xmlhttp.open("GET", "./controls.php?command=" + direction); xmlhttp.send(); break; case 3: direction = "forwardLeft"; var xmlhttp = new XMLHttpRequest(); xmlhttp.open("GET", "./controls.php?command=" + direction); xmlhttp.send(); break; case 4: direction = "left"; var xmlhttp = new XMLHttpRequest(); xmlhttp.open("GET", "./controls.php?command=" + direction); xmlhttp.send(); break; case 5: direction = "forwardRight"; var xmlhttp = new XMLHttpRequest(); xmlhttp.open("GET", "./controls.php?command=" + direction); xmlhttp.send(); break; case 6: direction = "right"; var xmlhttp = new XMLHttpRequest(); xmlhttp.open("GET", "./controls.php?command=" + direction); xmlhttp.send(); break; case 7: speed = "slow"; var xmlhttp = new XMLHttpRequest(); xmlhttp.open("GET", "./speed.php?speed=" + speed); xmlhttp.send(); break; case 8: speed = "medium"; var xmlhttp = new XMLHttpRequest(); xmlhttp.open("GET", "./speed.php?speed=" + speed); xmlhttp.send(); break; case 9: speed = "fast"; var xmlhttp = new XMLHttpRequest(); xmlhttp.open("GET", "./speed.php?speed=" + speed); xmlhttp.send(); break; } document.getElementById("currenttest").innerHTML = logfilename; document.getElementById("heading").innerHTML = direction; document.getElementById("speed").innerHTML = speed; xmlhttp.open("GET", "./battery-log.php?timer=" + timer + "&logfilename=" + logfilename + ".txt"); xmlhttp.send(); } } </script>
Code language: HTML, XML (xml)

battery-log.php

<?php if(!file_exists("logs")){ mkdir("logs"); } $logfilename = $_GET['logfilename']; $timer=$_GET['timer']; file_put_contents("logs/$logfilename", $timer); print "Command: ".$timer."<br>"; ?>
Code language: HTML, XML (xml)