Robust Big Piezo Button

A Robust Diy Button, Nearly Indestructible

Alain Mauer

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Description

It seems that people are interested in these buttons, so I made a project description just for them.

For a project I need a few robust buttons.
I could not find buttons in a certain size, so I decided to create my own.When you push or tap the front side of the button, you will get an impulse of +-1sec.The piezo will generated a small impulse, which is amplified by a transistor. A Ne555 in monostable mode gives me a 1sec impulse.

Details

This Button was created for a Project for my son. Each time you touch the front of the button or tap against it, you will get an impils of 1sec. You can change the length of the impuls, by changing the capacitor and the resistor of the timer cirquit. It is also a solution to use these buttons for older peoples or for People with disabilities.

Files

piezobu.zip The Gerber files for the Button x-zip-compressed - 37.17 kB - 05/03/2016 at 05:59		Download
taster2.dch The PCB in Diptace dch - 71.66 kB - 05/03/2016 at 05:58		Download
taster02.dip The shematic file in Diptrace dip - 93.87 kB - 05/03/2016 at 05:58		Download

Components

1 × 55mm Pipe Stop End
1 × Ne555 Discrete Semiconductors / Power Transistors and MOSFETs
1 × BC548 Discrete Semiconductors / Transistors, MOSFETs, FETs, IGBTs
2 × 10K Resistor
1 × 330R Resistor Electronic Components / Misc. Electronic Components

View all 11 components

Project Logs

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Shorten the impuls time
Alain Mauer • 09/09/2016 at 14:20 • 0 comments

The buttons have an impulstime of 0,7sec. I decided to change the 56k resistor R4 against a 10k resistor. Now the impulstime is 0,1 sec.
Mounted
Alain Mauer • 05/09/2016 at 16:55 • 0 comments

Here is the button mounted in the wood plate
Better to see
Alain Mauer • 05/04/2016 at 06:38 • 0 comments

I placed the 3mm Led on the backside.
It was easier to see the light of the Led from the outside than from the inside :)
Where I used these buttons
Alain Mauer • 05/03/2016 at 08:52 • 0 comments

I used 6 of these buttons here:
https://hackaday.io/project/11000-scotttv-a-simple-mediaplayer-for-my-autistic-son

View all 4 project logs

Build Instructions

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1

Step 1

Test Setup
2

Step 2

The housing for the button
I used a 55mm Pipe Stop End. I sand the piece to remove the irregularities.
In the pipe stop end, I glued a 35mm Piezo element inside it with epoxy glue
3

Step 3

The PCB
Because I need about 6 buttons, I decided to create a PCB.
I used DipTrace for the layout, and I ordered them at http://www.pcbway.com/