Notes [Photonicsguy.ca]

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====== Notes ======
====== APC Environmental card ======
AP9512TH

|IC1|LM35|Temperature Sensor|
|IC2|LM358N|Dual Opamp|
|IC3|LM78L|Vreg, 5V|
|BP1|{{:notes:tdk_chs-ugr_datasheet.pdf|TDK CHS-UGR}}|Humidity Sensor|


AP9612
|IC1|[[http://www.national.com/mpf/DC/ADC0834.html#Overview|ADC0834]]|8-Bit Serial I/O A/D Converter with Multiplexer Option|
|IC2|MM74HC14N|Hex inverting Schmitt trigger|
|IC5|P87C521| Controller|


====== PCF8574 - 8-Bit I/O Expander for I2C-Bus ======
[[http://www.ti.com/product/pcf8574?DCMP=A_SLL_SLL_SLL_Content&CMP=KNC-GoogleTI&247SEM#samples]]

====== Retroreflective yarn ======
  * [[http://scienceinspireddesign.wordpress.com/2010/10/25/3m-scotchlite-retro-reflective-yarn/]]
  * [[http://www.texturatrading.com/yarn.html#Retro]]

====== Timestamps ======
Convert Excel timestamp to unix time: ''=(EXCEL-25569)*86400''

Convert unix time to Excel timestamp: ''=(UNIX/86400)+25569''

5 hour timezone offset is (-5*3600)=18000 seconds

gnuplot.php
----
<code php>
<?PHP
if(isset($_REQUEST["file"])) {
header('Content-type: image/png');
passthru("gnuplot ".escapeshellcmd($_REQUEST["file"]));
die();
}
$dir="/var/www/gnuplot/";
if (is_dir($dir)) {
	if ($dh = opendir($dir)) {
		while (($file = readdir($dh)) !== false) {
			$split=split("\.",$file);
			if(filetype($dir . $file)=="file" && $split[1]=="gnuplot"){
				echo "<a href=\"gnuplot.php?file=".$split[0].".gnuplot\">".$split[0]."<BR>";
			}
		}
		closedir($dh);
		}
} ?></code>