Need to Build Two Circuits That Sense Proximity To Eachother

In summary, the individual is seeking to build two circuits that can detect proximity to each other with a range of 10-20ft. The circuits would increase in output voltage as they get closer to each other and should be cost-effective. Possible technologies that come to mind are RFID, Bluetooth, and using three coils or antennas for receiving to avoid orientation sensitivity. There is also a suggestion to use a Microchip RFID chip with a three coil arrangement.
  • #1
marineman78
1
0
Need to Build Two Circuits That "Sense" Proximity To Eachother

Hi all,

I am trying to build two circuits as part of an experiment that can "sense" proximity to one another. So basically, as they the two circuits get physically closer to each other (starting at a range of maybe 10-20ft), an output voltage increases in each of the units which I could then measure or connect to a small speaker. So the closer they get, the higher the voltage. Thoughts that come to mind are RFID, Bluetooth, etc. but I'd be interested in any ideas you guys have.

I also don't have a $100 to spend on this so it'd need to be relatively low cost. Thanks in advance!

-MM
 
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  • #2


Most receiver chips have an RFSS (RF signal strength) line that can give an idea of the signal level coming in.
Unfortunately, any RF technology you use has the weakness of being orientation sensitive. The angle of the antennas or coils will influence the reading greatly.
However, with three coils or antennas used during receiving, you can work out the vector sum of the input and get away from this weakness.
I think (not certain) that Microchip has an RFID chip used for vehicle key locks that has this three coil arrangement.

Best of Luck

- Mike
 

1. How do proximity sensors work in circuit design?

Proximity sensors work by emitting an electromagnetic field or beam and detecting changes in that field or beam caused by the presence of an object. This information is then used to trigger a response in the circuit, such as turning on an LED or activating an alarm.

2. What types of components are needed to build circuits that sense proximity?

The main components needed to build circuits that sense proximity are a proximity sensor, a microcontroller or integrated circuit, and any necessary supporting components such as resistors and capacitors. The type of proximity sensor used will depend on the specific application and the desired range and precision of detection.

3. Can proximity sensing circuits be used in both digital and analog applications?

Yes, proximity sensing circuits can be used in both digital and analog applications. Digital proximity sensors provide a simple on/off response when the proximity threshold is reached, while analog sensors provide continuous data output that can be used for more precise measurements or control.

4. How can interference be minimized in proximity sensing circuits?

Interference in proximity sensing circuits can be minimized by using shielded cables, proper grounding techniques, and careful placement of components to avoid overlapping fields. It is also important to choose the appropriate proximity sensor for the specific application to minimize the effects of interference.

5. What are some common applications for circuits that sense proximity to each other?

Circuits that sense proximity to each other have a wide range of applications, including security systems, touchless switches, motion-activated lighting, and robotics. They can also be used in industrial settings for detecting the presence of objects on a conveyor belt or in assembly lines.

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