HC-SR04 Ultrasonic Rangefinder (datasheet)
Field of View
How it Works
(from the datasheet)
A brief HIGH pulse (10uS or longer) on the Trigger pin (Trig) triggers the ping pulse train. A short while later an echo pulse is returned on the echo pin (Echo). The distance/range to the target is proportional to the width of the echo pulse according to the equations in the image above.
Hardware Setup
Pin Connections
| HC-SR04 | Arduino UNO |
|---|---|
| VCC | +5V |
| GND | GND |
| Trig | trigPin |
| Echo | echoPin |
NOTE: This is a 5V device. The Arduino FIO does not have a 5V supply. If you are using an external battery pack or power supply with the FIO that does have 5V, you should be able to use this device.
Code
This is adapted from Examples-06.Sensors-Ping.