Web 51 - DS1620 Thermometer

The ds1620 example includes a simple CGI script shtemp.cgi that uses the Dallas DS1620 to measure temperature. Reading from the device is converted to textual form and displayed in a WWW page. Besides textual display, the reading is used by two other scripts grapht.cgi and egrapht.cgi that display the temperature graphically.

Source html code stored in Web 51

<html><head>
<meta http-equiv="REFRESH" content=60>
<title>89C8252 WWW digital thermometer</title>
</head><body>
<h1>89C8252 & DS1620 WWW digital thermometer</h1>
<p><big><big>System temperature is: <b>'shtemp.cgi' °C</b></big></big></p>
<img src="blue.gif" alt="" border=0 width=20 height=20>
<img src="redblue.gif" alt="" border=0 width='grapht.cgi' height=20>
<img src="whblue.gif" alt="" border=0 width='egrapht.cgi' height=20>
<img src="blue.gif" alt="" border=0 width=20 height=20><br>
<img src="stupnice.gif" alt="" border=0 width=296 height=30>
</body></html>

Expanded html page as sent by the Web 51 server

<html><head>
<meta http-equiv="REFRESH" content=60>
<title>89C8252 WWW digital thermometer</title>
</head><body>
<h1>89C8252 & DS1620 WWW digital thermometer</h1>
<p><big><big>System temperature is: <b>+25.0 °C</b></big></big></p>
<img src="blue.gif" alt="" border=0 width=20 height=20>
<img src="redblue.gif" alt="" border=0 width=100 height=20>
<img src="whblue.gif" alt="" border=0 width=156 height=20>
<img src="blue.gif" alt="" border=0 width=20 height=20><br>
<img src="stupnice.gif" alt="" border=0 width=296 height=30>
</body></html>

This is what the user will see :

89C8252 & DS1620 WWW digital thermometer
System temperature is: +25.0 °C

References

DS1620 Digital Thermometer and Termostat (12 pg.) [local copy]
AN67 Applying and Using the DS1620 in Temperature Control Applications (4 pg.) [local copy]
AN85 Interfacing the DS1620 to the Motorola SPI Bus (3 pg.) [local copy]
AN105 High Resolution Temperature Measurement With Dallas Direct-to-Digital Temperature Sensors (20 pg.) [local copy]