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If you need some kind of simple "eye" for a robotics project this ultrasonic sensor could do well for finding and avoiding obstacles!
Use an HC-SR04 ultrasonic sensor to give your robot the perception of distance.
Application:
For collision avoidance projects, obstacle sensing Arduino tracked robot projects,autonomous vehicles and boats, physics lab classes
Features:
-Ultrasound modules/Ranging sensor works, both with Leonardo and mega.Great sensor for simple Arduino-based distance measurements, measuring distances Up to 30' and down to 3 inches.
- A lot of fun using these ultrasonic detectors for sonar on your Arduino powered obstacle avoidance robot.
--Objects as thin as cellophane or aluminum foil can be detected
How to Use:
There are 4 pins out of the module: VCC , Trig, Echo, GND.(Make the following connections from the HC-SR04 to the Arduino, respectively: VCC to 5V; GND to GND; Trig to any digital output; Echo to any digital input.)
The all process is : pull the Trig pin to high level for more than 10us impulse , the module start ranging ; finish ranging , If you find an object in front , Echo pin will be high level , and based on the different distance,it will take the different duration of high level. So we can calculated the distance easily.
Distance = ((Duration of high level)*(Sonic :340m/s))/2
Specification
1.Working Voltage : 5V(DC)
2.Static current: Less than 2mA.
3.Output signal: Electric frequency signal, high level 5V, low level 0V.
4.Sensor angle: Not more than 15 degrees
5.Detection distance: 2cm-450cm
6.High precision: Up to 0.3cm
7.Input trigger signal: 10us TTL impulse
8.Echo signal : output TTL PWL signal
9.Accuracy:+/-0.1cm(vary depending on the clock resolution real-time latency of the OS you use.)
Mode of connection:
1.VCC
2.trig(T)
3.echo(R)
4.GND

Measuring Module Ranging Ultrasonic Distance Sensor for Obstacle Avoidance in Arduino Projects Pack of 2 by Ardest

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