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Author Topic: Question - Vehicle detection for automated gates  (Read 641 times)
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Anifkin
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« on: May 07, 2020, 01:28:45 13:28 »

Hello,

Someone has asked me to help with their automated gates. They have (had!) an inductive ground loop for the exit, which detects vehicles and opens the gate. Unfortunately this has failed. To replace it will need the driveway to be channelled for new cabling. This is not ideal. So, does anyone have any suggestions for vehicle detection? There are a number of considerations...

1. In addition to opening the gates when a vehicle approaches, it also needs to detect presence of a possibly stationary vehicle, to prevent the gates closing on it.
2. Ideally it will be a single box solution (as opposed to a beam break, with a transmitter and receiver/reflector.

It's not too difficult to detect an approaching vehicle - the bigger problem is the presence detection. There is a beam across the gates where they are hinged, but if the vehicle isn't blocking this then the gates will close on it.

I've looked at lots of options, but thought you guys may have some suggestions I haven't considered.

Thanks a lot for reading.
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HackAndCrack
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« Reply #1 on: May 07, 2020, 01:55:03 13:55 »

You can use HC-SR04 ultrasonic sensor as a cheap solution.

You can use for a better solution a infrared temperature reader to get engine temperature and use another temperature sensor for ambient temperature and based on that detect vehicle presence.

You can use vibration sensor which can detect the vehicle vibration.

You can use combination of above for better detection.

You can use RFID between vehicle and gate.

There are other methods also.
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tyildizak
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« Reply #2 on: May 07, 2020, 03:39:26 15:39 »

There is a beam across the gates where they are hinged, but if the vehicle isn't blocking this then the gates will close on it.

You may install a second IR safety beam to just outside of the opening area as below:

« Last Edit: May 09, 2020, 01:34:24 13:34 by tyildizak » Logged
millegps
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« Reply #3 on: May 09, 2020, 04:11:26 16:11 »

I suggest you to use some industrial sensors already designed for that purpose, attached you can find some links. Please note I never used them, so I can't suggest a particular model and I'm not linked with any of the companies.

I think this solution is better for safety and legal issue you could have. Probably there are also some guideline/standars to follow in your country that you should check
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Sideshow Bob
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« Reply #4 on: May 09, 2020, 05:25:09 17:25 »

Did you get any reason for why a new cabling was needed. Could be interesting to know.
« Last Edit: May 09, 2020, 05:29:00 17:29 by Sideshow Bob » Logged

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bobcat1
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« Reply #5 on: May 11, 2020, 08:31:46 08:31 »

Hi Anifkin
There is several option :

1) Use LPR (license plate recognition - free software ) running on RPI + camera (low cost solution)
2) Use UHF RFID where you can activate the gate about 1-3 meter in front (ST has higher cost kit).

Using the method above only your (or any other authorized car can pass the gate).

All the best

Bobi 
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vern
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« Reply #6 on: May 11, 2020, 10:28:40 10:28 »

I would use a camera with an object recognition software, the camera could check if a car is approaching and could also read the license plates, it could also detect stationary objects that block the gate.
But I would also always have a mechanical safety solution like a switch or pressure sensitive bumpers on the gates just to be sure no one gets hurt.
You are responsible for any damage!
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pickit2
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« Reply #7 on: May 11, 2020, 12:43:50 12:43 »

Topic Locked
op has not made any comment after starting topic

6 posts in 11 years a member. 4 made after mute was lifted - when board was made open
this is a knee jerk reaction, mini flood posting.
start a topic and leave it floating.

user muted: 7 days as a wake up call:
« Last Edit: May 11, 2020, 12:53:06 12:53 by pickit2 » Logged

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