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Monolithic liquid crystal display range finder circuit compo

2016-12-09 21:33  
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Monolithic liquid crystal display range finder circuit composed of the intelligent ultrasonic ranging integrated circuit 4Y4
The monolithic liquid crystal display range finder circuit which is composed of the intelligent ultrasonic ranging integrated circuit 4Y4 is as shown in the figure. The meter is composed of the ultrasonic transmitter, the receiver, the LCD displayer, the button switch and the buzzer (or the speaker), in order to simplify the lead, we directly weld the 4Y4 at the back of the LCD display board. The pin-2 ~ pin-4, pin-8, pin-23 ~ pin-26 and pin-28 ~ pin-30 are not needed. R1 is the current-limiting resistance of the transmission circuit. R2~R4 are the external components of the receiving amplifier. C3 is the automatic reset capacitance. The crystal oscillator circuit uses the low-cost 455kHz piezoelectric ceramic to instead of the quartz crystal (JT), C1 and C2 are the oscillation capacitance. SB is the button switch.