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Arduino PulseIn Function Guide

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Basic Functionality: PulseIn measures high or low periods of signals in microseconds
Function works from 2-3us to 3 minutes
Can measure frequency by taking two measurements
Has timeout parameter (default 1 second)
Version Differences: PulseIn uses assembler code with fixed timing
PulseInLong uses Timer0 interrupt for timing
PulseInLong requires interrupts to be active
PulseIn works with interrupts off for better accuracy
Accuracy and Limitations: PulseIn measurements are empirical and error-prone
PulseInLong provides more accurate results for long pulses
Millis() function may not work with pulseIn without interrupts
PulseIn can take up to 1.5 periods to determine result
Implementation Details: Both versions use same algorithm to measure pulses
PulseIn waits for signal to go low before counting
PulseInLong uses micros() function for timing
Source code available in Arduino's hardware directory