computoman

The figure shows a schematic of the IR receiver circuit. The heart of the circuit is MOD1, an infrared detector module that removes the IR carrier frequency and transmits only the data that are encoded in the received IR signal. A suitable IR module is available at Radio Shack (No. 276-137 which is no longer sold). Might try Model: 276-640, but check the specs for sure. You probably could pull one from an old vcr.  The IR module needs a clean 5-V power supply, which is provided by IC1, a 7805 regulator. Power is supplied to the regulator by 9-V battery B1. The output of the module is wired to a male DB-25 multipin connector. The infrared detector module receives a signal, filters it, and removes the 40-kHz carrier. The output of the module is a TTL-level signal consisting of long and short pulses. The PC records those voltage levels over time, while the signal is being sent, and stores the data in a file. The line normally used by the PC's printer port to ind...

Did you know that you can use the thermistor from a personal computer fan to tell relative temperature?

An author had a circuit for a temp sensor as seen here (from http://www.instructables.com/id/DIY-Miniature-Thermometer/ ) : So I redid it to see if I could make more sense of it, Here is the author's code if you want to try it. http://www.mediafire.com/view/qn615bapt9t91a2/PocketThermometer.ino