Volume controlled alarm

[Colliex]

Hi there,
Would anyone have some suggestions as to which modules I should purchase and how I should design a circuit to go from a vibration sensor to a micro controller to a volume controlled alarm with a back up battery power supply.

 

[alec_t]

Welcome to ETO!
What sort of vibrations are we talking about? Fly's wing? Earthquake? ...?
Is the alarm just a personl one, or does it have to be broadcast to a large audience? ...or?
What battery do you plan to use?
Backup battery suggests you have an alternative power source. What is it?

 

[Andrei_D12]

Hi!
You should give us more details about the project you want to build, to know exactly how we can help with your project!

 

[Mikebits]

In this post someone is making a vibration doo hicky. https://www.electro-tech-online.com/threads/question-for-the-oscilloscope-experts.145961/unread

 

[Colliex]

I'm talking about the vibrations from a mobile phone. The alarm would be loud enough to hear through out a standard size house. I would preferably be able to power it via a USB power supply so the battery back up would need to be able to cover this.
Thanks
Mark

 

[alec_t]

Ok. What do you want the micro to do?

 

[Colliex]

As you can tell I am an electronics amateur but I presumed I would need a micro controller to power an LED for ready state and to switch off the alarm when the vibrating phone stops or at a predetermined amount of time. I am on call 24 hours a day and need to be able to hear my mobile ring when it is on the charger. The idea I have is to set up the vibration sensor on a component box and attach it to a tray which is mounted by flexible supports into which I can place my work phone when it is charging.

Thanks

Mark

 

[alec_t]

Do you have the equipment and skill set to scratch-build a system from a schematic and discrete components, or will you have to work with off-the-shelf modules? Do you have a charger for a small sealed lead acid battery to be used as the back-up power supply?

 

[Mikebits]

Why use the vibrator? When in vibrate mode, ring sound outputs on the headphone interface. You could plug your phone via the headphone jack into a wifi headphone to amp thingy.

 

[Colliex]

I am a tradesman so I do have the skills and equipment to solder components together. I would prefer to use modules if there is something available. Do I need a lead acid battery?

 

[dr pepper]

If you do a google you can do this without sensign vibrations, 'phones transmit before they ring or vibrate, and there are a few circuits on the web that detect the rf from the transmit and light a led or sound a beeper.

 

[alec_t]

Do I need a lead acid battery?

No; some other type will do. Alkaline cells would be ok, but if you want a rechargeable type then SLA or NiMh would be easier to keep topped up than, say, a lithium battery. You are likely going to need more than a few volts if you want an alarm to sound throughout the house.