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[on:]

can a 4 pin ultrasonic range finder be operational using only 3 pins as on the parallax ping sensors?

Thank You

[Reply #1 on:]

No, with the 4 pin, they have split the data lines to Echo and Trigger, instead of a single line. The 3 pin code will work, you just need to tweak it to work with trigger and echo. HINT: one is input and the other is output.

[Reply #2 on:]

You want some code or just general advice whether to buy a 4-pin sensor but run the 3-pin code?

Here is code snippet:

    micros_now=micros();
    digitalWrite(sonic_ranger_init,LOW);
    delayMicroseconds(2);
    digitalWrite(sonic_ranger_init,HIGH);
    delayMicroseconds(15);
    digitalWrite(sonic_ranger_init,LOW);
    delayMicroseconds(20);
    micros_delay=pulseIn(sonic_ranger_echo,HIGH,35000L);
    distance_mm=micros_delay*343/2000; // This is round trip time so 1/2/1000=1/2000
    Serial.println(distance_mm);

Go ahead and but the 4-pin sensor.