555 floodlight ultrasonic remote controller circuit

Published:2011/5/23 5:30:00 Author:TaoXi | Keyword: floodlight, ultrasonic, remote controller | From:SeekIC

As the figure 17-39 shows, the controller is composed of the ultrasonic remote control circuit and the control circuit, and it can be used in the application of light remote control switch. The astable multivibrator is composed of the 555 and the R1，RP1，C1, the oscillation frequency f=1.44/(R1+RP1)C1, by adjusting the RP1, we can keep the frequency between 40kHz+/-500Hz. The ultrasonic transmitter head uses the UCM40T piezoelectric sensor. If we adjust the RP1 on the output frequency load, the LM567 input signal will be larger than 25mV, the output port pin-8 has the low electrical level, VT3 is saturation conduction, SCR is trigger conduction, the light turns on.



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