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Return to BlogPSoC Ultrasonic Range Finder
Posted Feb 06, 2012 at 2:47 pm
Figure 1
A simple ultrasonic range finder built around PSoC microcontroller and providing LCD, serial, and PWM outputs.
The circuit is an inexpensive distance meter that includes a PSoC CY8C26443 microcontroller, a 40KHz ultrasonic transmitter and receiver pair, and a few other passive components.
The range finder is basically measures the time between the start of a transmitted burst and the start of a received burst. Since this time period is proportional to the distance, it does the calculations and writes the result to the LCD.
Range of the meter is 25-220 cm with 1cm resolution. It requires 5V DC source and draws about 25 mA with LCD.
The range finder provides three modes of output, an LCD output, a serial output with a baud rate of 9600 and PWM output.
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