Control Separate Circuit with motion sensor

Using Arduino Motors, Mechanics, Power and CNC
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Hello everybody, I’ve been searching a lot for a solution but couldn’t figure it out.
I need an expert suggestion,

Anyways, my project is Arduino UNO - connected with a motion sensor so it works as a switch for on and off command.

The problem is how can I connect a separate circuit electric toy, which it has it’s own battery to work. I think the toy cannot work with the arduino output voltage and current not enough to preform the toy. That’s why I need to use the toy’s battery to make the toy work.

So the motion sensor give a command to toy circuit to start once the motion sensor detects a movement.

I finished with the motion sensor, assembly and programmed.

My problem is how can I connect the toy circuit into the arduino board, So the motion sensor can switch on the toy circuit?

  1. Should I just disconnect the push button switch which it is in the toy circuit and just connect it direct to the Arduino pins?

  2. Can the motion sensor command the toy’s circuit to start?

  3. Should I use zenerdiod so the toy’s battery won’t go the arduino board?

Please advises my friends

Anyone know how to solve my case, I will be thankful :tulip:

IMG_6473
IMG_64734032×3024 2.55 MB

IMG_6474
IMG_64743024×4032 3.04 MB

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How is the controller powered?
Use an NPN transistor capable of handling the toy current. Let it switch the low side of the toy. Make sure the transistor can handle the toy current. Connect battery minus and controller GND. Use a serial resistor between controller output and the base of the transistor.

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