Play it Cool: Solving Thermal Problems, Page 2
Once I had the entire system up and running, I found one thing was missing-temperature reporting on demand. Although I spent most of my time on a computer of one type or another, I found it inconvenient to pull up a Web page or otherwise access the current data. After all, I had the audio system set up to be called upon at any time; I just needed a method to call it.
Contrary to my digital roots, I decided an analog solution would be best-put a physical button on my desktop, and I could push it anytime to hear the current temperature.
A visit to the local Radio Shack netted the required hardware, shown in Table 1.
Table 1: Hardware for the analog switch
|Part||Radio Shack Reference Page|
|25-pin D-sub connector||http://www.radioshack.com/product/index.jsp?productId=2103240|
I already had a 9-to-25-pin serial cable (the reason I went with a 25-pin connector for my project), assorted wire, a soldering iron, and a Dremel.
Building the Switch
Building the switch itself was straightforward:
- Solder wires between pins 4 and 6 on the D-sub connector and the contacts on the momentary switch.
- Dremel out a slot in the project box for the D-sub connector.
- Drill a hole in the other side of the project box for the momentary switch (button).
- Mount the pieces in the project box and connect it to the computer.
Figures 1 through 4 show the completed switch.
Figure 1: The inside of the project box.
Figure 2: The momentary switch (button) mounts on the front of the box.
Figure 3: The D-sub connector mounts on the back of the box.
Figure 4: The switch sits nearby, where I can press it whenever I like.