I got a question about CCS C and Ultrasonic Sensor.

Brian · Guest

Hello,

First of all, if the topic does not suit this forum, please let me know.

I am using PIC 16f877.

I bought a PING))) ultrasonic sensor from www.parallax.com

I have no idea how to use it. It looks like very easy to use (just 3 pins)but I do not know that how to write a C code to measure distance.

Does anyone get experience about this device?

Any help will be appreciated.

Thank you very much.

Sincerely,

tapasdas000 · Joined: 02 Apr 2009 Posts: 5

hi
The sensor u got is only three pins from which 2 are power supply so u
only got the pin is sig pin for your controller. I have not much idea about that sensor but in these type of obstacle detectors sensor if the distance changes there is a change in voltage level with the o/p pin i.e sig pin in your case so why don't u try adc to measure the voltage level change on sig pin.

i mean if the distance is propersonal to voltage level on sig pin your problem is solved.

Guest · Posted: Fri Apr 03, 2009 6:23 am

Hi,

That is not correct. The third pin is a shared digital I/O pin used to trigger the module, and determine the distance measured. Distance is determined by the pulse width of a pulse on this pin following triggering. The datasheet is available on the Parallax website, so this is really where you need to start!

Chuck

Brian · Guest

Hello,

Thank you for your reply.

I tried ADC but it didn't work.

Yes, I read the datasheet but I do not know how to measure the width of a pulse. I do not know how to write the C code.

I can trigger it to start but I do not know what the next step is.

I used output_high and output_low commands to trigger it and I saw the green LED on which indicates the device on active status.

I do not know what I should do in next step.

This is my first time to use this device.

Any help will be appreciated.

Thank you very much.

Sincerely,

Brian

languer · Joined: 09 Jan 2004 Posts: 144 Location: USA

You should use the search function before posting an open-ended question like this.

Look at the following post: Sonar - Ultrasonic Range Finder

PCM programmer · Joined: 06 Sep 2003 Posts: 21708

There is CCS source code on the internet. Search for this with Google:

Brian · Guest

Hello,

Thank you for your reply and suggestion.

I searched for it on google but I forgot to search this forum first. It is my bad. I am sorry about that.

I will take a look forum which languer gave.

By the way, I got some basic knowledge about C and maybe I am not so good in C so that is why I do not know how to start it. Anyway I try hard to learn about it.

I really appreciated you guys' reply and help.

Thank you very much

Sincerely,

Brian