Tiny Cooling Fan programming principles

"Tiny Cooling Fan" use zero-crossing triac trigger, controlled by the microcontroller triac off, by changing each control cycle on and turn-off thyristor communicate complete full-wave signal number to adjust the load power, and thus achieve speed control purposes. Because INT0 signal reflects frequency voltage zero-crossing time, so "dota雷竞技 " as long as the external interrupt 0 interrupt service routine complete control door opening and closing, and the use of the interrupt service frequency counts to control the amount of n and judgment that every interrupted once, to be n minus 1 count, if n is not equal to 0, to maintain control level "1" to continue to open the control door; if n = 0, then the control level is reset to "0", close the control gate, SCR zero trigger pulse is not passed. Control volume requirements such "dota雷竞技 " can be obtained in accordance with the control process, to achieve zero-crossing triac control, so as to achieve the effect by controlling the amount of control to achieve speed is adjustable.