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The stored data can be output in CSV format. The number of data that can be stored is unlimited. (only graph, only table, both graph and table) Lap times are saved as data. There are three types of lap time display. He admits that the wiring is a bit questionable, but says that after about seven hours of rough use, everything is still intact and working great. Lap Timer Time is measured in increments of 0.01 seconds. The timer uses an ATMega32 to run the show, displaying relevant time and location information on an LCD panel he scavenged from the trash bin. He cut the receiver down to the necessary parts and then started work on the lap timer itself. He found what he was looking for after a bit of probing and hooked it up to his computer to see if the data contained NMEA sentences.
LAP TIMER FOR MAC SERIAL
Since he didn’t require routing functions to keep track of his lap times, he splayed the GPS receiver open and started hunting around for a serial bit stream.
LAP TIMER FOR MAC SOFTWARE
He scored a “broken” GPS receiver on eBay for a measly £4 and found that the receiver worked, but corrupted software prevented the unit from mapping routes. With the race budget running dry, he and his teammates needed something cheap, if not free, to get the job done. Hackaday forum member was training for an endurance race, and rather than having someone verbally call out his lap times, he wanted something he could keep in-vehicle to help keep track of his performance.