Decoding the telephone-generated DTMF is the purpose of building the DTMF decoder 2 which can be connected directly to a serial port and use a HyperTerminal on a PC to view the digits.
Measuring the torque in an automobile drive shaft is the purpose of designing this horsepower monitor device which can provide an output to a portable computer via an RS232 interface or a vehicle data recording system.
This Sun Tracker project was created in order to help people overcome the Seasonal Affective Disorder (SAD) by reflecting the sunlight into the house and keeping the reflection all day long.