0

Ultrasound vs. IR sensors
Moderators: adafruit_support_bill, adafruit

Please be positive and constructive with your questions and comments.

Ultrasound vs. IR sensors

by project_science on Wed Apr 19, 2017 6:36 pm

Hi,

I need to make a project which uses a detection trigger system, using either ultrasound or IR sensors. The system needs to run 5 sensors, each spaced 4 ft apart on a line.
I have two choices:

5x Sonar: https://www.adafruit.com/product/982

OR…

5x IR: https://www.adafruit.com/product/1031

Question: Which has a narrower beam width (less interference with other of the same sensors in the area): the sonar (ID: 982) or the IR sensor (ID: 1031)?

Thanks!

project_science
 
Posts: 83
Joined: Sun May 04, 2014 1:26 pm

Re: Ultrasound vs. IR sensors

by adafruit_support_rick on Wed Apr 19, 2017 7:27 pm

The sonar will interfere with each other. The IR sensors are what you want. If you do encounter interference you can put a baffle on the receiver to block out adjacent light sources.

adafruit_support_rick
 
Posts: 33058
Joined: Tue Mar 15, 2011 11:42 am
Location: Buffalo, NY

Re: Ultrasound vs. IR sensors

by adafruit_support_bill on Wed Apr 19, 2017 7:32 pm

Actually, the Maxbotix sensors can be wired to synchronize with each other to avoid interference. See page 5 of the data sheet: http://www.maxbotix.com/documents/HRLV- ... asheet.pdf

I've done this using sensors with intentionally crossed beam patterns for triangulation on a target and it works quite well.

adafruit_support_bill
 
Posts: 58326
Joined: Sat Feb 07, 2009 10:11 am

Re: Ultrasound vs. IR sensors

by project_science on Thu Apr 20, 2017 4:11 pm

I think I should have added, that the sensors will be run from different microcontrollers - 3 to be exact. Two of the UNOs will run two sensors, and then 1 UNO will only run one. I have reasons for this.

Given this situation, that's why I'm asking which has minimal change of interference. I'll be using a target detection range of 1-3 or 1-4 feet.

project_science
 
Posts: 83
Joined: Sun May 04, 2014 1:26 pm

Re: Ultrasound vs. IR sensors

by adafruit_support_bill on Thu Apr 20, 2017 4:19 pm

The Maxbotix sensor synchronization is independent of the microcontroller. You could wire a whole array of synchronized sensors and monitor their outputs with separate controllers.

adafruit_support_bill
 
Posts: 58326
Joined: Sat Feb 07, 2009 10:11 am

Please be positive and constructive with your questions and comments.