The next challenge was reading the data coming off the GPS sensor at 4800bps.The TI-84 Plus series of calculators have a series of interrupts that can fire at fractions of the 15MHz clock.

Learn more about how we select deals. TL;DR: The forever-useful Texas Instruments TI-84 Plus graphing calculator is on sale for $88 at Walmart, saving you $28. Since the dawn of time (okay ...