Ultrasonic Transmiter

The photo depicts the schematics for an Ultrasonic Transmitter which will send a signal out into it's surrounding area. The Ultrasonic receiver will detect this signal once it bounces off from an object. The combination of these two sensors will allow the aerial robot to detect objects in its path and maneuver around the objects. These sensors will be attached in front of the plane. These sensors will also help the robot navigate through the halls of any building.. This tutorial will show how to construct and test one pair of ultrasonic proximity receiver and transmitter.

Motivation and Audience

Readers of this tutorial assumes the reader has the following background and interests:

The rest of the tutorial is presented as follows:

Parts List and Sources

US-based vendors to obtain material to complete this tutorial include:

To complete this tutorial, you'll need the following items:

TABLE 1: Parts needed to build Ultrasonic Proximity Sensor
LM555 precision timmer
Radio Shack30867 1
2N2222 NPN transmitter
JDR29911$0.46 per 100+ Unit1
0.0033 (0.0047) UF ceramic capacitorRadio Shack272-130 1
0.1 UF ceramic capacitorRadio Shack29663 1
Ultrasonic transmitter (40KHz)MPJA12941$5.491
8 pin dip socket
Radio Shack276-1995 1
1 K ohm resistor
Jameco29663 1
1.2 K ohm resistor
Jameco29735 1
2.2 K ohm resistor
Jameco30314 1
5 (5.1???) K ohm resistor
Prototyping Circuit BoardRadio Shack276-148$1.691


This section gives step-by-step instructions along with photos to the construction of Ultrasonic Proximity Transmitter. Because this is a very simple circuit, only a schematic for the sensor is shown here: (For the PDF format click here.)

Data Collected

Click here to see the data collected.

Final Words

This tutorial's objective was to help others built a ultrasonic proximity transmitter which combined with a ultrasonic receiver will be used as the eyes of a robot. Complete construction details and photos are included in this tutorial for the sensor. Once the concepts are conveyed the reader should be able to build their own sensor.

Click here to email me