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Ultrasonic Range Meter

On these pages, I will introduce the Ultrasonic Range Meter with PIC16F873. As for the range meter which doesn't use PIC, refer to "Ultrasonic Range Meter". With this circuit, the following features of PIC16F873 are used.
Capture | The time which is reflected and returns to the object after sending out a ultrasonic is measured.
A/D converter | The propagation speed of the sound changes with the temperature. I used A/D converter to revise a display.
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