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Need a longer-range distance device.

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sj_h1
(@sj_h1)
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I need a sensor to detect up to 15 feet (4.5 meters). It does not need to be accurate, however, it does need to be consistent. Most of the devices I have look at are only good to 1-2 meters. The only exception is lidar which way out of my budget. Anybody got some ideas?

 


   
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Will
 Will
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Posted by: @sj_h1

I need a sensor to detect up to 15 feet (4.5 meters).

Detect what ? Goats, Humans, Extra-terrestrials ? Heat ? Motion ? Rising taxes ? Drones ?

Would a PIR work for you ?

It does not need to be accurate, however, it does need to be consistent.

Accurate in distance or direction ?

Experience is what you get when you don't get what you want.


   
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RCC1
 RCC1
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Check Amazon.  They have a waterproof Ultrasonic sensor ($16.99/2) that said it would do slightly longer distances than the normal SRO4 ones.   One place in the text description said 25 cm to 4 M. In the pictures on the left side, it shows 20cm to 600cm.  I have not personally used this item.  Just noticed it when browsing the site.

Amazon.com: HiLetgo 2pcs JSN-SR04T Integrated Ultrasonic Module Distance Measuring Transducer Sensor Waterproof for Arduino : Industrial & Scientific

You could ask the Amazon vendor a question about what the actual distance specification is.  One person in the FAQ's answered it was not good at detecting soft items.   I'm not sure if Extra-terrestrials are considered hard surfaces or soft surfaced?

RCC1


   
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sj_h1
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@rcc1 That would work but I only need 1 and was hoping to keep it under $10.


   
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RCC1
 RCC1
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Also worth watching, is the DroneBot Workshop video about that sensor as compared to others 

Waterproof Ultrasonic Distance Sensors - JSN-SR04T & A02YYUW 💧☔ - YouTube

You still have not explained your application.  There may be other sensors that fit.

RCC1


   
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sj_h1
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@rcc1 Its just a stop signal for parking the car in the garage. The garage has objects in the front of the garage, so it is not obvious when you have pulled in far enough but not too far. I am guessing the distance is 10 feet, but it could be farther. Since it is inside a garage it need not be waterproof.

 

 


   
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Will
 Will
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@sj_h1 

Just hang a ping pong ball from the roof of the garage so that it just touches the windshield of your car when it's at the proper distance into the garage.

Experience is what you get when you don't get what you want.


   
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sj_h1
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@will That only works if you always pull in forward. I need this for backing in too.

 


   
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Will
 Will
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@sj_h1 

Hang a second one (different colour) for reversing in.

Experience is what you get when you don't get what you want.


   
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sj_h1
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@will 3 cars

 


   
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Will
 Will
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@sj_h1 

You sure are a hard guy to please ... 🙂

OK, build a small wooden frame out of 2" thick wood (so that a car wheel or a shotgun can move over the top of it and have the interior protected). Cut a notch in it to allow wiring to pass underneath it to power the sensor pack.

Inside this frame, place an Arduino and a HC-SR04 sensor pointed UP at the minimum distance from the FRONT wall for the longest vehicle to be placed in the garage and glue the cord into the notch. Run the cord to a convenient power source.

Set the Arduino to flash the overhead lights, sound a siren, fire a cannon ... your choice of attention-getting devices. Set the Arduino to do all of this when the HC-SR04 finds an object within 14" above it (well within the capability) because that means a vehicle has just arrived at the minimum safe distance from the door of the garage.

If you restrict the locations to one specific slot for each vehicle, then place the sensor at a convenient distance from the front door to allow it to close safely in front of that specific vehicle. Doesn't matter whether you drive, back or push it in, the car's the same length in both directions.

Experience is what you get when you don't get what you want.


   
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sj_h1
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Still not the best answer.


   
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Will
 Will
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@sj_h1 

Well then, have a happy life.

Experience is what you get when you don't get what you want.


   
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DaveE
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Hi @sj_h1,

I have no relevant experience or recommendation to offer, but on searching I noticed:

The data sheet (click tiny red PDF button in middle of page) on the web page

https://www.digikey.co.uk/en/products/detail/adafruit-industries-llc/982/5356850?utm_adgroup=Ultrasonic%20Receivers,%20Transmitters

mentions range to over 6m (245 inches) ----

LV-MaxSonar®-EZ™ Series
High Performance Sonar Range Finder
MB1000, MB1010, MB1020, MB1030, MB10402
With 2.5V - 5.5V power the LV-MaxSonar-EZ provides very short to long-range
detection and ranging in a very small package. The LV-MaxSonar-EZ detects objects
from 0-inches to 254-inches (6.45-meters) and provides sonar range information 
from 6-inches out to 254-inches with 1-inch resolution. 
Objects from 0-inches to 6-inches typically rangeas 6-inches1.
The interface output formats included are pulse width output,
 analog voltage output, and RS232 serial
output. Factory calibration and testing is completed with a flat object.
 1See Close Range Operation

The data sheet discusses several different versions ... how this ties up with the single adafruit part offered by digikey is unclear.

I have no idea if it is supported by any of the Arduino libraries.

It might also be over budget. And it might not work...

But it might be worth a look if you don't mind doing some R&D!

Good luck, Dave

 

 


   
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sj_h1
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@davee The link you gave point to a sensor that has a range of 20 inches, however, the data sheet also includes the MaxSonar version which does have the distance, however, I have been unable to find them on Digi-key or amazon.

 

 

 


   
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