I have an arduino uno powered by a battery on a buggy with a sonar distance sensor. I have a program that calculates the speed it's going, and I want to correlate speed with stopping distance. I can measure the stopping distance manually, but I want the arduino to report to me the speed it was going when the motor was turned off. I don't have an LCD display - I wanted to print the number to the serial monitor, but plugging it back into the USB port resets everything I think, or at least the serial monitor.
Without buying more components, can I get the data (calculated speed) somehow?