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Movement sensor to trigger an electric motor - supercheap! Answered

Hello Any electronics whizzes out there? I want to develop a kids toy that reacts when a child moves within a certain range of it. (Remember that game "Grandmothers Footsteps" where you have to creep up on somone but become motionless when they turn around - if you're caught moving you're out.) The sensor and the circuitry (and some moving parts) need to be able to fit inside something the size of a pint glass, run off batteries and preferrably be drawing no current when no-one is in range. Please - if you have some ideas on this drop me a line and I'll explain further. thanks for looking this far! Julius (London, UK)



9 years ago

Hey that make me think of this billy fish that start to sing and to move( with a motor) when you past beside, its exactly what you need ( movement trigger motor), you can take the same component and the basic of the circuit to build your toy . It run on 2 AA battery and I don't think it drain battery and all the components can easily fit inside a pint glass, look at this picture.(try this in google for more picture: billy singing fish or boogie bass )

Ive just found the perfect things, this is a website that show how this fish work , I think you will have everythings you need there(it explain the circuit)
here is the links:


Reply 9 years ago

nice idea. I used to have one of these but the fish's skin started rotting! I found that the light-sensor was only effective in certain lighting situations. I'll see if i still have my fish in the attic. Julius


Reply 9 years ago

Correction : it run on 4 AA battery, and the movement sensor seem to be a photosensor