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PostPosted: Wed Apr 17, 2019 2:07 pm 
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I am considering a bell target for myself for practising here in the workshop. I want it to look like a proper original version so steel plate and box however with a modern twist:

Two LEDS, one green showing ready to shoot and one red if the 'bell' is rung.
An audible output such as a buzzer or even a WAV file to replace the bell
A remote control to reset from green to red for the next shot if required.

Is this a Raspberry Pi candidate or a simple circuit project, bearing in mind I am crap at electronic design and I equally would like to keep costs down.

Thoughts anyone?

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PostPosted: Wed Apr 17, 2019 2:34 pm 
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Interesting project - Could be done with a hinged plate and a micro switch to momentarily sound a buzzer/LED but you would need a transistor/capacitor circuit to set some sort of delay so buzzer sounds for half a second or so.

Could certainly be done with a Ras Pi, although I've never used one. Could be done with an Arduino with a bit of thought, they're as cheap as chips, you could set your sound/lights on delay to whatever you want.

You could detect your shot with a microphone.

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PostPosted: Wed Apr 17, 2019 2:40 pm 
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I considered doing this (though I've yet to get round to it, using one of the plug in accelerometer modules for the raspberry pi.

Stick the module to the back of a hanging steel plate, and hopefully the accelleration caused by an impact will supply an output.


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PostPosted: Wed Apr 17, 2019 2:51 pm 
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An accelerometer is a nice idea however the .177 pellet is going to be striking at anything up to around 10-11ft lbs energy which is enough to sting a bit so I do wonder how long the printed circuit would last.

Arduino is an alternative I had not considered.

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PostPosted: Wed Apr 17, 2019 2:59 pm 
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"An audible output such as a buzzer or even a WAV file to replace the bell"

That is just so wrong on every level.

Why make a "not a bell target"! wallhead

Just because you can doen't mean you should, is nothing sacred from digital destruction?

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PostPosted: Wed Apr 17, 2019 3:09 pm 
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Ovenpaa wrote:
An accelerometer is a nice idea however the .177 pellet is going to be striking at anything up to around 10-11ft lbs energy which is enough to sting a bit so I do wonder how long the printed circuit would last.

Arduino is an alternative I had not considered.



If its behind a suitably sized lump of steel, it will be fine, the physics means the g-forces experianced by a 200gram lump of steel when struck by a 0.5gram pellet shouldn't be too excessive (I did the maths a while ago for .22LR and a ~2Kg plate and it was well within the limits of the cheap one I'd found which i think was 60 or 80g.) Think of it as lorry vs smartcar.. the lorry often won't notice the collision.


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