Try googling " automotive radar "
This hit off the top of the list looks promising:
https://www.nxp.com/applications/so...bility/automotive-radar-systems:RADAR-SYSTEMS
JimB
Is this while you are on the move or to pick up if something is close to you while parking / stationary ?
You could have a look at microwave sensors if it is just to detect an object while driving.
Hi OE,Hi everyone,
I'm looking to make my own proximity wing mirror sensor project, but, can't pinpoint the type of sensors used.
For regular proximity sensors (parking sensors), the limit is 2,5 metres, max 3 metres.
(the kind used in this kit = https://www.ebay.co.uk/itm/New-Reve...655083?hash=item58cf37af2b:g:BF8AAOSwAYtWGN5U)
However, I'm looking to use sensors which sense up to 6 metres. Are there any
recommendations please?
thanks
Hi OE,
Your best bet would be to use an ultrasonic transmitter/receiver- the transmitter sends an ultrasonic pulse which is reflected by any object in the beam. If there is no object there is no reflected signal.
The reflected signal is detected by the ultrasonic receiver.
Electronics would then be required to calculate the time from transmission to the time of reception and from that time the distance of the reflecting object can be detected.
The simplest, lowest cost, quickest to implement, and best performing option would be to use a single board microcontroller (Raspberry Pi or Arduino) and an ultrasonic hat/shield.
The presence of an object could be indicated by illuminating a LED or a buzzer or both.
Of course, some software would be required, but nothing demanding.
spec
How would that work at speed with wind interference / doppler shift with fast moving vehicles etc ? You may well also have the issue of interference on rainy days.Hi OE,
Your best bet would be to use an ultrasonic transmitter/receiver- the transmitter sends an ultrasonic pulse which is reflected by any object in the beam. If there is no object there is no reflected signal.
good point my friend.How would that work at speed with wind interference / doppler shift with fast moving vehicles etc ? You may well also have the issue of interference on rainy days.
How would that work at speed with wind interference / doppler shift with fast moving vehicles etc ? You may well also have the issue of interference on rainy days.
Some interesting reading here : https://www.pepperl-fuchs.com/global/en/25518.htm
I was involved in a project similar to what you were after many years ago and investigated the ultrasonic side of things but there were too many variables at speed to accurately or reliably measure distance so gave up on that. You also have to bargain in other drivers ultrasonic sensors as they will also give you false positives.
I would now say ultrasonics are no go.so ultrasonic is a no go then?
As a matter of fact I have been busy with just this typeof project the last few days. See here for one of the best sensors available: https://www.aliexpress.com/item/US-.../2038168189.html?spm=2114.13010308.0.0.O9ulqDHi OE,
Your best bet would be to use an ultrasonic transmitter/receiver- the transmitter sends an ultrasonic pulse which is reflected by any object in the beam. If there is no object there is no reflected signal.
The reflected signal is detected by the ultrasonic receiver.
Electronics would then be required to calculate the time from transmission to the time of reception and from that time the distance of the reflecting object can be detected.
The simplest, lowest cost, quickest to implement, and best performing option would be to use a single board microcontroller (Raspberry Pi or Arduino) and an ultrasonic hat/shield.
The presence of an object could be indicated by illuminating a LED or a buzzer or both.
Of course, some software would be required, but nothing demanding.
spec
Some interesting reading here : https://www.pepperl-fuchs.com/global/en/25518.htm
I was involved in a project similar to what you were after many years ago and investigated the ultrasonic side of things but there were too many variables at speed to accurately or reliably measure distance so gave up on that. You also have to bargain in other drivers ultrasonic sensors as they will also give you false positives.
As a matter of fact I have been busy with just this typeof project the last few days. See here for one of the best sensors available: https://www.aliexpress.com/item/US-.../2038168189.html?spm=2114.13010308.0.0.O9ulqD
Temperature compensated, range of about 5m,..
Problem with longer ranges is that the sound signal gets "distracted" by all sorts of echos; the typical beamwidth is between 15 and 30 degrees, but the further you try to reach the more noise you get in the response signal.
If you are interested I can send you a summary for a program that drives a sonar and reads its responses but also removes spurious signals and does some signalprocessing to get a decent measurement.
How would that work at speed with wind interference / doppler shift with fast moving vehicles etc ? You may well also have the issue of interference on rainy days.
See here for one of the best sensors available: https://www.aliexpress.com/item/US-.../2038168189.html?spm=2114.13010308.0.0.O9ulqD
Temperature compensated, range of about 5m,..
Problem with longer ranges is that the sound signal gets "distracted" by all sorts of echos; the typical beamwidth is between 15 and 30 degrees, but the further you try to reach the more noise you get in the response signal.
If you are interested I can send you a summary for a program that drives a sonar and reads its responses but also removes spurious signals and does some signalprocessing to get a decent measurement.
If the OP could provide some concrete information ie type of vehicle and exact purpose of sensors ("..on the move..": at what speeds, what purpose,..?) I would be able to provide more relevant information.
U.S. sensors can measure distances very accurately but there ate a number of constraints for use in open air. For example, no obstruction is allowed between sensor and object, so how would you accomplish this on the front side of a car?
I know of a lot of applications where these sensors are used in stationary and/or relatively slow moving vehicles but some more information from OP would be helpful.
Given the fulfilment of some basic constraints I would opt hands down for this kind of sensor for distance measurement (if you choose the right one).
Programming too is "very" easy, even including signal processing to eliminate erroneous readings (if you know C++ a bit).
I doubt it's a problem. Ultrasound works at speeds of around 760 mph. The issues you're bringing up might effect only a few feet per second -- the percentage difference renders it negligible.
As far as rain goes, the beam width of the ultrasonic signal and its reflection is way wider than a drop of rain. Inherent filtering takes care of any other noise.
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