1. Home
  2. Electronic Components
  3. rangefinders....

rangefinders....

I'm thinking of making a device to watch for cars coming up my driveway. I know about the commercial monitors for this, but they have some drawbacks I'm trying to work around. So... I'm asking if anyone knows of a good sensor solution for this. The requirements are:

Range: 10-50 feet, narrow angle Ambient: daylight Senses: vehicle moving towards the sensor Reports: distance or speed

My idea is to monitor the signal and try to discriminate against non-vehicles (animals) as well as ignore vehicles moving *away* from the sensor. Bonus if it's precise enough to detect humans walking towards it (constant speed, specific size).

Low cost and low average power use is important too.

I have plenty of MCU experience, I just need a sensor solution.

Thanks, DJ

Reply to
DJ Delorie
Loading thread data ...

Would be difficult, particularly if said object is approaching at walking pace, is about the same size, and weight of a car, makes the same rumbling noises as a car, but is made entirely of organic material.

I mean, it would never be able to warn if the mother in law is approaching.

Ok, ok. I'll leave quietly.

Reply to
John Tserkezis

Police band receiver.

--
Adrian C
Reply to
Adrian C

The early Gunn diode based microwave alarms could detect anything that reflects a signal, including people. The direction can be sensed as well, but requires more circuitry. The return signal is beat against the CW microwave signal, giving an audio signal. Early solid state police RADAR used them, along with the automatic door openers in retail stores.

Please do.

--
Anyone wanting to run for any political office in the US should have to
have a DD214, and a honorable discharge.
Reply to
Michael A. Terrell

driveway.

knows

the

towards

material.

approaching.

Perhaps a FM CW radar. Can give you distance and Doppler as well cross checked by per interval delta distance. Triangle (linear) FM.

Reply to
JosephKK

ElectronDepot website is not affiliated with any of the manufacturers or service providers discussed here. All logos and trade names are the property of their respective owners.