Radio / wifi / RFID Orienteering

Projects General Guidance
1

Hello ! I want to build an Orienteering based on radio / rfid / wifi proximity detection.

The idea is to give to a children a map with an area in which you can find an arduino which emit a signal (wifi / rfid / radio - fm/ ?). The children has a recepter (arduino) which beep stronger when he get closed to the emiter.

What's the best way to realise that ? We want the "beep" to be hearable at about 5 to 10m from the emiter.

I looked in wifi, bluetooth, rfid and fm technolgy but I'm not sure which is the best to do it...

Waiting for any reply :wink:

Best Regards,

2

Wow, i recently researched for something similar.

Drone poker.

If you use 125 Khz RFID tags you can get a range of about 1 metre.

Beyond that you need active tags, with a battery.
These are often used in car keyfobs but are difficult (expensive) for the home builder.

Using Bluetooth may work but i am not sure about the range being reliable.

EDIT.

If all the arduinos talk to each other via WIFI and are equipped with GPS, that should give you the required range but equipment cost could be high.

3

Actually, as has been explained here, short distance rangefinding as such is quite impractical.

The mode which better suits is radio "foxhunting" using directional antennae. A popular pastime in the Amateur ("Ham") Radio fraternity, which is where you need to direct your research.

Nothing to do with Arduino however.

4

Yes not really suitable for children though.

Ultrasonic beacons perhaps ?

5

Paul__B:
The mode which better suits is radio "foxhunting" using directional antennae. A popular pastime in the Amateur ("Ham") Radio fraternity, which is where you need to direct your research.

Boardburner2:
Yes not really suitable for children though.

Not so....have a look at the paragraph "year end function" and photo here. (Hammies being a South African Radio League initiative for junior hams (ZUxxx calls).

6

Ok, OP just said children though not hams.

I used to do that stuff myself but it was as a HAM not an orienteer.

7

ISTR one of the arduino puzzzle/trasure hunt groups was experimenting with ibeacons at one point , not sure if they had sucess with it though.

Do the children have to find the arduino or is proximity enough (unmanned checkpoint type thing)?

8

Boardburner2:
Yes not really suitable for children though.

And why on earth would it not be? Children love it.

Only requirement is that someone in control be licensed.

9

OK OK i get it .

I will pick my words more carefully next time.

I happen to have done both as a youngster, both with the cubs, scouts and ham community.

The requirements of orienteering and foxhunting are slightly different.

I will wait and see if the OP responds to clarify.