PC based

Here we deals with some circuits which work with PC.Don't affraid about your PC.Then only you can win in this field.So first i want to say you should be courage and same time you want to give some attention about your pc.Before connecting the circuit to the Pc you must check it once more isevery thing is coorect and there isn't mistake.Use regulated power supplay only.If you have much knowledge in computer Programmming (C,C++,VB,DOS) then You can understoud the working of the circuit and program easily..


1)PC THERMO METER
This circuit can use to measure the temparature of your pc or anything elese .The out put is shown in the task bar of you desk top.Sou you can use this circuit to moniterize the temparature of any of your precious devices.The heart of th circuit is digital temperature sensor DS1621 /DS1631 of Dallas Semiconductor.It is a desital temparature sensor

 

Tech facts:

• displays both indoor and outside temperature on the Windows taskbar (see figure)
• plugs in any free PC com port
• range -20 ... +125ฐC   (-4 ... 257ฐF)
• basic accuracy and resolution 0.5ฐC
• Centigrade (ฐC) of Farenheit (ฐF) scale
• data logging on easily readable text file (good for Excel)
• sampling rate 1, 5, 30 or 60 seconds
• one or two temperature sensors (upgradeable up to 8)
• com port powered, no external power supply required
• easy to build, no exotic nor programmable parts inside
• no calibration required
• full source code available for free (educational and non-commercial uses only)