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Functional specification 20 characters x 4 lines LCD with four separate screens Pressure reading of 0 to 1050 mbar 16 bit adc giving a resolution of approximately 3 - 5 feet QFE and QNH offsets with quick toggle between the two Quick zero of QFE TAS readout from pitot tube Glide angle based on dial input (estimated) head/tailwind Glide distance until reach dial input height Barograph automatically records height, variometer, temperature and speed when timer runs Barograph can record every second Two barograph memories capable of storing 27 minutes of readings when taken every second Vario sounder updates twice a second Vario readout updates once a second, derived from altitude in software Vario resolution of 0.2 up/down (20fpm) to maximum of 25.4 up / down. Timer, with auto start and stop PC Interface at 19200baud 8N1 with additional engineering diagnostics Temperature sensor with 0.2 degree resolution Current consumption of 12.3 mA, 30mA when piezo sounding Assuming 400mAh PP3, battery life estimated as 22 hours No tetris, yet! Major components Microchip PIC16F76-I/SP running at 4MHz Analog Devices AD7705BN running at 1MHz Motorola MPX4100A pressure sensor for altitude Motorola MPXV5004GC7U pressure sensor for pitot tube TS3V914IN rail to rail low voltage supply op-amp AD680JT precision 2.5V reference MDLS20464-LV 20 x 4 LCD module MAX3223 RS232 convertor M24128N6 32 kbyte eeprom Back to top ...