I need a critical help in designing a magic toy

[salvazero]

I want design this project for magic shows, and I would like to include this in the act.
How Can I design a circuit so I can make the ball move? I need to design circuit for it.

The wand will have the transmitter.
The ball will have the receiver in it.
I want to make it stop when the wand is less than 1 feet away and or plus 2+ feet away.
Start at 1-2 feet, spacing is not critical. Close is good enough. Parts I think I need.

The Wand
1. An adjustable transmitter
2. Battery The ball
1. A receiver
2. Motor-is not included in the circuit
3. Battery
4. Gears- is not included in the circuit

I need for you to advise me on what is the best way to make this magic toy. I just need the circuit without the motor or gears.
See the example


This is an example only

I need a correct circuit for it.

1. I need a transmitter to transmitter only at a distant of 1-2 feet only. I was told that I would need an adjustable transmitter and Receiver.
2. I will be removing the on and off switch in the ball and replacing it with the receiver, to tell it to come on or off. The receiver will open and close the circuit for the battery to activate the switch.

Can you supply me a schematic showing me the wires to connect and what type of transmitter and Receiver to buy and any other components that I might need to complete the circuit?
I want to know Schematic showing me the wires to connect and Parts I will need.

Any help will be appreciated.

Thanks in advance

 

[shrtrnd]

It seems to me that this would be simpler if you just use an electromagnet wand, and a metal ball.
Or a variation on that depending on what exactly you want to do with it.
For example, you could have a table or mat with magnets or electromagnets, and have a metal ball do things
on that via wand.
This sounds like you have a specific trick in mind with this. If my first options won't work for this, you'll probably
get other ideas from the other forum members.

 

[davenn]

The wand will have the transmitter.
The ball will have the receiver in it.
I want to make it stop when the wand is less than 1 feet away and or plus 2+ feet away.
Start at 1-2 feet, spacing is not critical. Close is good enough. Parts I think I need.

I doubt that this will work using a radio transceiver pair. This is because radio signal doesn't just stop at a particular distance
it just gets weaker and weaker the further apart the transmitter and receiver are
your tx/rx pair will still be in easy contact at anything up to 20 - 30 ft or so

electromagnets as shrtrnd suggested may be something to try

 

[chopnhack]

This is because radio signal doesn't just stop at a particular distance
it just gets weaker and weaker the further apart the transmitter and receiver are
your tx/rx pair

Good point, dave.

OP - the schematic you included has a microprocessor - that could be used to give your ball the roll on/off signal based on feedback (i.e. distance) from the ball. The transmission and reception would be ongoing at all times, so you would need to make sure you use low powered μcu's and rx/tx devices so that your total power draw is low. Are you able to cram all the circuitry, battery and gears into your selected ball size? Will there be any risk of transmission interference?

 

[Alec_t]

Rather than use a radio link, a magnet in the wand and a Hall sensor in the ball might be simpler.