The current concept incorporates a wireless transmitter and receiver and is thought to be used for remote controlled airplanes or appliances with two seperate parts. Build with Analog to digital converter NSC ADC12130, a Microchip PIC16F84 controller, a quad op-amp NSC LMC660, a Maxim MAX232 RS232 level shifter, and the Motorola MPXS4100A absolute pressure sensor.
http://www.trash.net/~luethi/microchip/projects/alti/alti.html