A GPS data logger that records position data from the GPS module. The position data is received in NMEA-0183 format and store its sequence into any storage device. The position data can be processed with existing GPS utilities for interesting applications.

To store the tracking log, MMC/SDC is used for the recording media. The MMC/SDC is the most suitable purpose to collect the logged data to the PC. The GPS data logger is mainly used on automobile, so that its power supply circuit should pass the load dump surge immunity test. The operating power is got from only ACC line for good usability, and power switch is ommited. To detect brown-out and power-off, input supply voltage is monitored with the microcntroller. The controller part works at 3.0 volts and the GPS module works at 5.0 volts are tied via a level converters each other.

3.5 seconds after the power-up, logging operation is started. The log file, YYMMDD.log, is created in current UTC time. When same name is already existing, it starts to store from end of the file.

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