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Discuss Detecting vehicles in one direction only. How to do it? in the Electrical Forum area at ElectriciansForums.net

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I need to sense the arrival of vehicles along a driveway, to switch on security lighting at night. But only to operate when vehicles arrive, not when they are leaving and driving away.

I bought a USVD-4X ultrasonic detector:
Vehicle Detector | Drive Through Sensing - https://www.motion29.com/products/controlandsensing/drivethruvehiclesensorusvd4x/default.htm
I assumed the 'pulse on entry' and 'pulse on exit' settings determined the direction of travel of the vehicle (ie entry to, or exit from, a premises). But tests show otherwise: it means pulse on arrival and stopping by the sensor, and/or another pulse on driving away, like at a drive-through food place.

Is there any off-the-shelf device which will do what I need, without having say two PIRs or break-beams, then complicated logic in a microcontroller which will probably need rebooting or will otherwise go wrong. I want a fit-and forget industrial quality solution.

Any ideas?

Thanks, Mark
 
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marconi

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Mentor
Arms
Esteemed
One way to remotely detect both movement and direction is to use an active radar system with moving target indication signal processing. I found this microwave product which is easily programmable and can sense presence, movement and direction.

In its description it says:

The Herkules is supplied with default settings for a variety of industrial door applications, broad selection of evaluation options for people and vehicles with optional direction recognition and crossing traffic masking.

You might want to study it further and contact the manufacturer.

Microwave Motion Detector | Vehicle Detector - https://www.motion29.com/products/controlandsensing/microwavemotiondetectors/default.htm

Would you provide us with an update on your final solution please?
 
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B

Bobster

You don't want a micro controller but something like a Rockwell 810 or siemens logo with 2 photoelectric sensors would be simple, reliable and reasonable cheap.

It wouldn't take any more than 4 lines of code.
 

Charlie_

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Arms
The best and easiest solution for this problem would be a vehicle radar detector, using the Doppler effect
I have fitted hundreds of these devices to many traffic signal systems..
The best one out there in my opinion is the Siemens Heimdall..
Very easy to install and to set up, very robust and reliability is 2nd to none.
No need to write any code, the units have little dip switches for various parameters.
 
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DPG

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Advent Win
Does it really matter that the security light comes on when cars drive away? A bit of illumination would have been better if anything I would have thought.
 

Spoon

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Does it really matter that the security light comes on when cars drive away? A bit of illumination would have been better if anything I would have thought.
Most prob a fussy customer who is happy to pay 4 times the amount to get things done as he/she wants.
 
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  • #8
Does it really matter that the security light comes on when cars drive away? A bit of illumination would have been better if anything I would have thought.
A perfectly good point but yes, as it's wasteful and feels poorly engineered, as the sensor will be at the end of a 200m drive, so the 'bit of light' (actually about 20 LED floodlights around the site) is way behind you. There are a few normal PIR fittings to help with leaving.

Most prob a fussy customer who is happy to pay 4 times the amount to get things done as he/she wants.
Absolutely! The customer is a nightmare who over-engineers everything just for the fun of it.

ps. This is my own house:)
 
S

Squid

Tell you customer to work harder and to buy a house with a larger drive, one gate entry the other exit, simples......... ;o))))
 

static zap

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Advent Win
Most prob a fussy customer who is happy to pay 4 times the amount to get things done as he/she wants.
Then moan because "customers" sus out they can get carpark lit for their mates by driving out -Then "Reversing" --irresponsibly-- !
-- Any cyclists are likely to be flattened--
(and doubly peed-off)
 

static zap

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Advent Win
Hit button on wall -before leaving - Timer blacks out PIR for pre-detemined time( /or/shines discreet batman spot at day sensor of PIR ? .)
(leaving in stealth -very batman)
-Night vision building nicely-
 
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The Herkules unit mentioned earlier will do what you require, you just have to make sure you mount it on a firm surface and at least 3 meters from the ground. If you get in touch with us (Motion29) on Tuesday, we'll arrange an exchange of the USVD-4X with a Herkules.
 
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The Herkules unit mentioned earlier will do what you require, you just have to make sure you mount it on a firm surface and at least 3 meters from the ground. If you get in touch with us (Motion29) on Tuesday, we'll arrange an exchange of the USVD-4X with a Herkules.
Hi Andy
To find me on here you're either an expert stalker, or you have some very effective Google alerts going on! :)
Thanks for the offer to exchange. I'll get the old unit sent back asap.
It might be a good idea to amend the description from 'entry ' and 'exit' to perhaps 'arrival' and 'departure', so this doesn't happen again.
Many thanks for your exemplary customer service - If anyone else on here needs vehicle detection kit, you know where to go!
 
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  • #14
... Would you provide us with an update on your final solution please?
Certainly. I'll post a photo once it's done and actually working ...

Many thanks to you and Charlie for recommending Doppler radar. I should have thought of that myself!

cf. 'If this [red] sticker is blue, you're driving too fast' :)
 
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Hi Andy
To find me on here you're either an expert stalker, or you have some very effective Google alerts going on! :)
Thanks for the offer to exchange. I'll get the old unit sent back asap.
It might be a good idea to amend the description from 'entry ' and 'exit' to perhaps 'arrival' and 'departure', so this doesn't happen again.
Many thanks for your exemplary customer service - If anyone else on here needs vehicle detection kit, you know where to go!
Hi Mark,

No stalking going, just coincidence that the link you originally posted was used yesterday when I was covering our Web chat service. Happy to get you the correct solution working for your project.
 
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