1. Ultra Sonic Range Finder
Scott Jackson

2. What does it do? The ranger finder uses sound to measure distance.
The time between a sound being emitted and an echo being received tells how far apart the object and the range finder are.

3. Tech Specs Black Wire – Ground Blue Wire – Init White Wire – Echo
Red Wire – VCC
Black Wire – Ground
Blue Wire – Init
White Wire – Echo
Min
Max
Unit
Supply Voltage VCC
4.5
6.8 V
High Level Input Voltage VIH (for Init)
2.1
Low Level Input Voltage VIL (for Init)
0.6
Delay time: Power up to Init High 5 ms
Input current (with 2.1V in on Init) 1 mA
Transducer Output Voltage (Peak to Peak)
Typical: 400
Supply current during transmit period
2000

4. Speed of sound = ~760mph = 1114.67 ft/s
‘ For distance from time, use Y = rt/2
For time from distance,
Y = 0.5(rt)

5. What Can We Use It For? Costs about $36 Security Systems Robots!
Advantages
Fairly Accurate
Disadvantages
Outside noise can affect echo signal