Design and build a small DC-powered device with enclosure:
Input will be a 0-2V, 0-5V or 0-12V pulse signal, 0 to 3 Khz.
Device will use a CPU with precise clock interrupt to count pulses each second. Because the signals have a high degree of jitter (up to 10% of the duty cycle time), you cannot use a frequency counting method that measures time...
Skills: analog electronics, digital electronics, embedded systems, manufacturing, hardware design