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The schematic below is the Sensor Head portion of the Ultrasonic Ranging System. See the additional main documentation for more details. The schematic below shows the Timing portion of the Ultrasonic Ranging System. Be careful when wiring up these two circuits to reduce the return signal from the Sensor Head to TTL levels before introducing it to the Timing circuit. The echo signal must dip below 0.8 volts before the TTL logic will recognize it as a low.