HVAC Control Panel Example

In many warehouses or offices it is necessary to be able to regulate the HVAC system on the fly. This example shows a control panel for a heating ventilation and cooling system. Facilities managers and maintenance technicians connected to the companies network could view this web page and turn on or off the heat or air conditioning based on the current room air temperature. Also, the web page displays the current that the motor is pulling. This can be used to modify your systems to improve there efficiency.

To setup the EZ Web Lynx, simply connect the pins in the following orientation. Pin one should be connected to the motor, pin two through four should be connected to the power lines of the separate systems. These systems include heating, air conditioning, and the fan. In addition to these control systems, pin 5 should be connected to the test circuitry. This test circuitry could be used to monitor many different system states. Also, a Dallas DS1631 I²C temperature sensor should be hooked up to pins 10 and 11 with an address of zero. This example demonstrates the EZ Web Lynx's ability to control digital outputs and analog inputs.

HTML Example - HVAC Control Panel

<html>
  <head>
    <meta http-equiv="content-type" content="text/html; charset=ISO-8859-1" />
  </head>
  <body>
  <p style="text-align:center;">
    <b><span style="font-size:28pt">HVAC CONTROL PANEL</span></b>
  </p>
  <p>
    <hr>
  </p>
  <p>
    <table>
      <tr>
        <td>
           
        </td>
        <td>
           
        </td>
        <td>
           
        </td>
        <td>
          Status
        </td>
      </tr>
      <tr>
        <td>
          <b><span style="font-size:12pt">A/C</span></b>
        </td>
        <td>
          <form method="POST">
          <input type="hidden" name="PIN_OUTPUT2" value="1"/>
          <input type="submit" value="ON"/> 
          </form>
        </td>
        <td>
          <form method="POST"> 
          <input type="hidden" name="PIN_OUTPUT2" value="0" />
          <input type="submit" value="OFF" />
          </form>
        </td>
        <td>
          <b>
            <span style="font-size:12pt"><!--(IF PIN_OUTPUT2 = 1)-->
            <span style="color:green">ON</span>
            <!--(ELSE)--><span style="color:red">OFF</span>
            <!--(ENDIF)--></span>
          </b>
        </td>
      </tr>
      <tr>
        <td>
          <span style="font-size:12pt;"><b>HEAT</b></span>
        </td>
        <td>
          <form method="POST">
          <input type="hidden" name="PIN_OUTPUT3" value="1"/>
          <input type="submit" value="ON"/> 
          </form>
        </td>
        <td>
          <form method="POST"> 
          <input type="hidden" name="PIN_OUTPUT3" value="0" />
          <input type="submit" value="OFF" />
          </form>
        </td>
        <td>
          <b>
            <span style="font-size:12pt"> <!--(IF PIN_OUTPUT3 = 1)-->
            <span style="color:green">ON</span>
            <!--(ELSE)--><span style="color:red">OFF</span>
            <!--(ENDIF)--></span>
          </b>
        </td>
      </tr>
      <tr>
        <td>
          <span style="font-size:12pt;"><b>FAN</b></span>
        </td>
        <td>
          <form method="POST">
          <input type="hidden" name="PIN_OUTPUT4" value="1"/>
          <input type="submit" value="ON"/> 
          </form>
        </td>
        <td>
          <form method="POST"> 
          <input type="hidden" name="PIN_OUTPUT4" value="0" />
          <input type="submit" value="OFF" />
          </form>
        </td>
        <td>
          <b>
            <span style="font-size:12pt"> <!--(IF PIN_OUTPUT4 = 1)-->
            <span style="color:green">ON</span>
            <!--(ELSE)--><span style="color:red">OFF</span>
            <!--(ENDIF)--></span>
          </b>
        </td>
      </tr>
    </table>
  </p>
  <p>
    <span style="font-size:12pt;"><b>AIR TEMPERATURE</b></span>
     <!--(READ TEMPF0)-->ºF
  </p>
  <p>
    <span style="font-size:12pt;"><b>MOTOR CURRENT</b></span>
     <!--(PIN 1 ANALOG/5,2)--> A
  </p>
  <p>
    <form method="POST"> 
    <input type="hidden" name="PIN_OUTPUT5" value="1" />
    <input type="submit" value="ENABLE TEST" />
    </form>
  </p>
  </body>
</html>