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Extra info for Circuit Cellar (February 2003)
The indoor humidity sensor plugs into a circular well in the middle of the panel. greater than a threshold value, and outputs 0 V when the detector output is less than the threshold. With a time constant of many milliseconds, the threshold voltage adjusts itself to the average value of the detector output. The analog-to digital conversion is faithful if the threshold voltage settles at a value that is halfway between the minimum and maximum detector output; this will be true if the digital packet contains equal numbers of intermixed 1 and 0 bits.
0000 min. 0000 min. 0000 min. 0000 min. Greenwich Time (hour, minute, second) Upload time interval = basic upload time × upload time rate 0 means OK; 1 means alarm Byte 1: aberrance alarm Byte 2: over-speed alarm Byte 3: dangerous area alarm Byte 4: manual alarm Stop symbol of data package Table 2—Take a look at the 42-byte data package format and the following example ready to be saved: :10019999E121263457N311864290742160030000#. and NMEA initialization and configuration data messages are transmitted and received through port A.
SOURCES AD7713 sigma-delta ADC Analog Devices, Inc. com AT24C01, AT89C51/52 Atmel Corp. com 87C520/80C320 Dallas Semiconductor, Inc. , Santa Clara, CA, 1994. MCS-51 Microcontroller Intel Corp. com ———, Microprocessor and Peripheral Handbook, vol. , Santa Clara, CA, 1988. 75176 transceiver Texas Instruments, Inc. com CIRCUIT CELLAR® Issue 151 February 2003 29 FEATURE ARTICLE Ma Chao & Lin Ming GPS-GSM Mobile Navigator w What’s the more laudable engineering feat, designing a navigation system capable of tracking ships in Shanghai Port or placing at the top of a competitive design contest?
Circuit Cellar (February 2003)