Pin 4 (RESET): when a Low level is received at the pin, the timer will be reset and the output will return to Low level usually connected to positive pole or neglected Pin 3 (OUTPUT): outputs High or Low, two states 0 and 1 decided by the input electrical level maximum output current approx. Pin 2 (TRIGGER ): when the voltage at the pin reduces to 1/3 of the VCC (or the threshold defined by the control board), the output terminal sends out a High level The 555 is a complex hybrid circuit with dozens of components such as a divider, comparator, basic R-S trigger, discharge tube, and buffer. It is now widely used in various electronic products because of its reliability, convenience, and low price. The 555 IC was originally used as a timer, hence the name 555 time base circuit.
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