TKJ Electronics

Today I recieved a Ultrasonic Range Sensor bought on eBay.

It’s much like the Parallax Ping))), except that it has got a Trig and a Echo pin, instead of the Ping)))’s multipin (Trig and Echo on the same pin)

I quickly made some code in the Arduino IDE and got it running quick…

Just a sidenode from the physics class; as the sound is travelling thru air with a speed of 340 m/s, this can be recalculated to 0.034 cm/microsecond, which is the same as 29.411 microsecond/cm

Arduino with Ultrasonic Sensor

For those who may be interested the code is here:

/* Ultrasonic Sensor

This sketch reads a ultrasonic rangefinder and returns the

distance to the closest object in range. To do this, it sends a pulse

to the sensor to initiate a reading, then listens for a pulse

to return.  The length of the returning pulse is proportional to

the distance of the object from the sensor.
The circuit:

* +V connection of the Ultrasonic Sensor attached to +5V

* GND connection of the Ultrasonic Sensor attached to ground

* Trig connection of the Ultrasonic Sensor attached to digital pin 2

* Echo connection of the Ultrasonic Sensor attached to digital pin 3
created 25. Januar 2010

by Thomas Jespersen
*/

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