We can make *anything* (7 Feb, 2020)

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We can make *anything* (7 Feb, 2020)

Postby aardvark_admin » Fri Feb 07, 2020 5:15 am

This column is archived at: https://aardvark.co.nz/daily/2020/0207.shtml

Okay, given the limitations of budget and available technology (no time machines I'm afraid), tell me what you'd like to see me build.

It can be mechanical, electronic, aerodynamic or just about anything else that falls within the scope of my knowledge, understanding and experience.

Fire away... I'm all ears and the project that most captures my interest will be documented online as I attempt to turn the idea into a reality.
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Re: We can make *anything* (7 Feb, 2020)

Postby cjet » Fri Feb 07, 2020 9:56 am

Three nine gram servos

One RPi4 to control three servo

Hot glue one to a base
Hot glue second base to firsts servo arm offsetting the pivots
Hot glue third servo base to seconds servo arm again offsetting the pivot axis

Python language to control servos

Aim of the program is not to tangle the control wires

But to artistically demonstrate all range of movement

Is AI to explore range

Map the third servo arm with pencil and draw underside of a card

Use softest pencil

See if a website can receive designs

And cards printed designs at a distance.

Make a card holder above the servos. With legs to the base first servo affixed to

Use gravity and weight of card to put pressure on pencil lead

First design request on card
A. Three concentric circles 5mm in radius difference.
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Re: We can make *anything* (7 Feb, 2020)

Postby pid@ifm.net.nz » Fri Feb 07, 2020 1:49 pm

* CNC Machine
* 3D Printer using more exotic materials
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Idea Needed

Postby Perry » Fri Feb 07, 2020 2:16 pm

(Shades of Popular Mechanics?)

Thefts and burglaries are becoming increasingly common.

Locksmiths and copsmiths tell me that surveillance cameras are only useful after-the-fact.

Power can be cut. Phone lines can be cut. Both severances nullify most recording devices. Even a UPS doesn't solve all the risks.

Impeding easy access is the gist of the advice given.

Perhaps arresting egress / departure could work?

Whatever it is, the approach does need to be one of outside-the-box thinking.
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Re: We can make *anything* (7 Feb, 2020)

Postby phill » Fri Feb 07, 2020 2:42 pm

an easy design to take the output of the kitchen smoke alarm into another room
sp .. the battery types

a mod on how i run mine
i have a wired burglar alarm system with 2 smoke sensors on it
the central sensor runs through the alarm system as usual
the kitchen sensor ( because it goes off in most houses on a regular basis ) drives a separate dedicated piezo alarm in the main bedroom
wakes me up for any genuine kitchen fire .. is sufficiently remote not to annoy if working in the kitchen and it goes off
( ,,,,,,,, ....... A E I O U use em sparingly theres probably not enough )

i might live and eat in a sewer .. but hey look how many of these shiny things i have got
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Re: Idea Needed

Postby aardvark_admin » Fri Feb 07, 2020 4:01 pm

Perry wrote:(Shades of Popular Mechanics?)

Thefts and burglaries are becoming increasingly common.

Locksmiths and copsmiths tell me that surveillance cameras are only useful after-the-fact.

My workshop has three alarms.

One is image-motion activated, notifies me via the Net and sends video to the cloud.
One is PIR and sends me an SMS
One is PIR and activates (without a delay) a 132dB siren which is right by the door.

Anyone that tries to steal stuff will be easy to find by following the trail of excrement that gushes from their shorts when that siren goes off right in their ear :-)
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Re: We can make *anything* (7 Feb, 2020)

Postby Perry » Fri Feb 07, 2020 7:42 pm

Right. And if the low-lifes cut the electricity supply first - what then?

A home that's going to be empty at least till the end of the day, or the w'end, would be another matter, would it not?
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Re: We can make *anything* (7 Feb, 2020)

Postby joeseph » Fri Feb 07, 2020 9:20 pm

Must say braincells are not the most common supply among a lot of thieves - our last telly was stolen (along with the smashed cabinet top it was still bolted to) whilst the remote was left sitting on the mantlepiece next to it...
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Re: We can make *anything* (7 Feb, 2020)

Postby aardvark_admin » Sat Feb 08, 2020 3:39 am

Perry wrote:Right. And if the low-lifes cut the electricity supply first - what then?

Cutting the power triggers one of the alarms which notifies me and everthing has battery backup that's good for over 12 hours.

I can also get a live video feed from a camera so if the alarm advises me that the power is off I just pull out my phone and take a look around to make sure it's nothing more than a power failure.

It's sad that one must invest so much effort/money in protecting your property from those who believe they're entitled to take whatever they want :-(
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Re: We can make *anything* (7 Feb, 2020)

Postby Perry » Sat Feb 08, 2020 7:34 am

Bruce wrote:It's sad that one must invest so much effort/money in protecting your property from those who believe they're entitled to take whatever they want :-(

So true. In a daylight burglary here, the offenders were confronted and they were totally brazen. (And looked like they were 'high.')

That was months ago and despite providing the police with photographs, positive IDs vehicle rego, they're still on the loose and still stealing.

Now we have to 'live' with road gates which remain locked, so a big inconvenience every time we come and go. Plus let visitors in and out.

Time for that little ditty, again:

Crime fighting costs
But motorists pay
Cars we will stop
While crims get away.
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