Use around the digital temperature sensor DS18B20 acquisition environment temperature, single-chip timer interrupt generating pulse width modulation control bidirectional silicon controlled rectifier, voltage change at both ends of the motor, so as to achieve the purpose of changing speed. Set in a certain temperature range, pulse duty ratio corresponding timer interrupt, and then form a corresponding duty cycle of the PWM wave, through the microcontroller pin to control the internal integration of a photoelectric coupling MOC3041 zero circuit, opto coupler to trigger bidirectional thyristor.

test_3.ddb

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