Description :
The SRF05 is fully compatible with the SRF04 and has a increased range of 3cm-4m. The sensor can operate using a single pin for trigger and echo freeing up valuable pins on your microcontroller. Alternatively it can use seperate trigger and echo pins like the SRF04.
A small delay is included prior to the echo pulse to allow slower controllers like the Basic Stamp and Picaxe to execute their pulse in commands.
There’s even a little LED on the back that blinks when the sensor is triggered so you know it’s doing something if you don’t have super canine hearing.
Here’s the beam pattern…
Specification :
The Devantech SRF05 is a dual-element ultrasonic distance ranger designed for excellent all-around performance. It’s not as “smart” as other ultrasonic sensors, but it has a very good operational range, and being dual-elements, you can read much closer distances than with a single-element ultrasonic module.
The SRF05 can run with 3 or 4 connection lines, depending how you want to use it. Two lines are power and ground.
In the 3-line mode, trigger and echo-detect pins are combined in function. Starting low, hold the trigger/echo line high for at least 10uS, then drop it back low again to initiate the pulse ping (sent on the falling edge of the signal). This line then toggles to an output, which will pull low when the echo is received back. Then it’s simple math to convert the distance using the approximate speed of sound in air of 0.9 feet per millisecond measured.
In 4-line mode, the trigger and echo-detect lines are separated, each needing a I/O line. Yes, it takes up another I/O line, but sometimes it’s easier to work your code that way, especially if you have I/O to spare!
Here are the specifications:
| Range | 3 to 400cm (1.18″ to 13.1′) |
| Power | 5V, 4mA (typ) |
| Frequency | 40kHz |
| Size | 43mm x 20mm x 17mm tall (1.69″ x 0.79″ x 0.67 tall) |
| Connections | Selectable 1 or 2 I/O plus power/ground |
