Questions about button types, button debouncing, button interfacing, etc.
3
votes
3answers
74 views
Energy efficient one button on/off with extra function
(Old) cellphones have a button to turn it on (when off), end a call (when on, short press) or turn it off (when on, long press).
I need something similar for a microcontroller. The device is ...
3
votes
1answer
73 views
Electrical properties of keyboard keys
I'm looking to hack together a keyboard by taking an existing keyboard and connecting it to switches that I'll assemble separately.
What I want to know: What should be the electrical properties of ...
0
votes
1answer
64 views
How to wire a Normally Open Button to a BeagleBone Black?
This one should be simple, but I'm fairly new to this.
The button has a COM and an NO terminal. Beaglebone pins can only take 6mA, so I don't have much room for error. My question is, how do I wire ...
3
votes
1answer
143 views
What's this button called
Whats the correct name for this button, it's 12mm high measured from the PCB with 6.5mm base. It is flexible in that it can move around in the switch base.
The button is used on an instrument panel ...
3
votes
1answer
185 views
Is it possible to use just a capacitor to debounce a button?
I have been wondering: why cannot you just hook up a capacitor to a button to debounce it? I have been figuring out how to reduce the work my microprocessor has to do, but I have very limited space on ...
6
votes
2answers
137 views
How do these modern power buttons on devices work
In the older days and still now we have buttons where one way is off and the other way is on, its mechanically built to connect or disconnect an electric path physically.
On modern devices like ...
0
votes
1answer
73 views
Why the Locking Buttons? (Project for blind user)
I was trying to build this: http://www.shaungehring.com/2013/01/03/raspberry-pi-project-1-pandora-streamer/ for a blind user. The large buttons are a key aspect for this target user. But, I've noticed ...
3
votes
2answers
177 views
Sending data through the iphone headphone jack
I recently bought a TRRS Pigtail on sparkfun and I want to have two buttons attached to one end of the cord and another end connected to the iphone in the headphone jack. I would like to be able to ...
6
votes
5answers
209 views
Connecting push button to a controller pin
This problem is decades old but I do not see a direct answer to it on this site. I want the following:
This circuit just allows to check the state of the button from inside the micro-controller. ...
-1
votes
2answers
182 views
Robotic button pusher [closed]
I purchased a Gigapan Epic Pro a while back (www.gigapan.com).
I love this device but I would like to be able to access the buttons on it, from a distance. (I want to mount the unit on top of a ...
2
votes
4answers
234 views
Playing a small MP3 file
simulate this circuit – Schematic created using CircuitLab
I'm creating a hand-held device with a momentary push button that will activate an LED and play a sound or MP3 (I didn't include ...
3
votes
2answers
128 views
What values / components do I need in this flip-flop circuit?
I need a circuit to make a relay toggle when pushing a push button. I found this circuit here:
It looks good for me - please tell me if it won't work.
I intend to work with a push button to Vcc ...
1
vote
3answers
300 views
AVR Button Interfacing
I am a beginner of the micro-controller and I have the kit for AVR. I am currently using an ATMega16 to learn the basics. I have tried a few simple experiments with this micro-controller using LED's. ...
1
vote
1answer
76 views
Replacement IC for the touch-button QT1081?
A project I'm working on needs several touch buttons. I found the datasheet for the Atmel QT1081, which supports up to 8 capacitive buttons, with the added advantage for our circuit that there are ...
-1
votes
1answer
59 views
Kensington trackball button
I'm looking for replacement button for Kensingtons "Orbit Trackball with Scroll Ring". I'm hoping to find at least something similar.
Here is how the original button looks like:
Button dimensions
...
11
votes
3answers
468 views
Physics behind switch bounce when opening?
I was surprised to learn that a mechanical switch (SPST) bounces when it is opened. What causes the contact to temporarily return to touching?
Does this phenomenon only happen with certain types of ...
0
votes
2answers
168 views
Is this a SPST Off-(NO) N/O NO Latching Push Button Switch
I bought this from ebay
expecting it to be the style of switch that when you push the button it connects the circuit until it is pressed again then it breaks it, like a ballpoint pen..
instead upon ...
1
vote
1answer
164 views
Multiple switches to multiple inputs - what kind of diode?
I have six buttons going into a microcontroller on six IO pins. I have a seventh pin that acts as an interrupt and wakes the microcontroller, which is always asleep until a button is pressed (this is ...
2
votes
1answer
383 views
What is a momentary SPST Push Button Switch?
I want to buy a switch (push button) where you press it to break the circuit and then press again to connect the circuit.
I believe that this is what I'm looking for:
However, I'm not entirely ...
1
vote
2answers
71 views
Time parameters of pressing a tact button by people
Sorry for bad English.
How fast people can press a tact button? I.e. what is minimal time of holding a button pressed people can get?
What is typical bouncing time when people press tact button?
I ...
2
votes
5answers
94 views
device for outputting HIGH when input have been HIGH?
I am looking for a device or circuit that outputs HIGH when a pushbutton has been pressed (if the button is pressed again it is supposed to still output HIGH), also, if possible, another pushbutton ...
2
votes
1answer
53 views
Options of Button Labeling
I've made a few electronic devices, and most of them had buttons or switches, but I had to rely on my memory to remember which button did what.
What kind of hardware options are out there for ...
5
votes
4answers
270 views
Does a switch need to be debounced when opened?
Suppose that an input on a microcontroller has a pullup resistor to 5V and a switch to ground (normally open) connected to it. I know that a switch should be debounced (in my case, in software) when ...
0
votes
0answers
127 views
Merging two PCB boards [closed]
I have a PCB board from an all-in-one computer I want to be able to use with a spare laptop motherboard. The PCB button board has momentary switch and 3 square LEDs for the power on indicators as ...
1
vote
3answers
338 views
How can I get this button to be more reliable for my arduino program?
I have been working on this program for a simple controller. I have a prototype all wired up and working however the momentary push button is not very reliable. Sometimes it reads and other times it ...
-2
votes
2answers
84 views
Sponge-thing that makes buttons pop back out is torn, any fix? [closed]
I'm not sure if this question is fit for this forum. This is my problem, I have a USB game controller (generic) and the spongy thing that's supposed to make the buttons pop back out is slightly torn. ...
5
votes
1answer
566 views
How is this Pushbutton Debounce code?
I am monitoring a pushbutton with a microcontroller where I am trying to take care of four things together:
50-msec debounce upon push-begin and 25-msec debounce upon push-release
identify a ...
0
votes
2answers
157 views
Arduino - connecting a button to a digital pin [duplicate]
Possible Duplicate:
Pull Down Resistors
I'm new to Arduino, can you please tell me why in this scheme the gray wire and the resistor are needed? Why won't it work without them? Thank you!
...
0
votes
0answers
115 views
Button Pad Design
I want to design a button pad similar to the one shown below.
I've tried searching for information on what goes into designing something like this but have found nothing. Particularly, what I am ...
2
votes
1answer
105 views
Rewiring KVM Buttons
Background: I'm working on a project that would allow a number of people to hook up their laptops to a single monitor through a KVM and use buttons on the desk to control who has control of the ...
-1
votes
1answer
86 views
12 VDC Power to Illuminated Button
I want to hook up a push button on my photobooth following this guide.
I already have a serial cable and a port on my machine. The button I will be using is this one here.
It is an illuminated ...
2
votes
2answers
523 views
What does the tamper button on my STM3220G-EVAL board do?
Reading through the reference manual of the STM3220G-EVAL development board (an ARM Cortex-M3 dev/eval board) I see that it has a "tamper button", also weirdly referred to as an "anti-tamper button".
...
1
vote
2answers
291 views
Triggering buttons with a diode
total newbie here.
I was reading this post:
http://dduino.blogspot.com/2012/02/trigger-buttons-with-arduino.html
It is basically trying to trigger a button in an IC from an arduino(green) pin.
I ...
2
votes
3answers
123 views
Substitute a button for a timed event?
Disclaimer: I am a total newbie
I have something I bought that once is switched on does something each time I press a button, now, I want that to happen periodically(no accuracy needed) so I was ...
0
votes
3answers
369 views
How to wire up a circuit with a button that cancels other circuits
What I really want to do is slightly more complex than this but I can distill it down to the following concept. Let's say I have 4 buttons and 4 LED lights. Each button turns on 1 LED light. If any ...
0
votes
1answer
503 views
Arduino external power source causes timing issues
I was prototyping a project (basically a servo and piezo controlled by a button with some LEDs to indicate the state) everything was going fine. So I decided to take the project off the ardiuno board ...
4
votes
2answers
329 views
Connect(solder) a Arduino to some buttons
I don't have much experience with electrical engineering and teachers have given us(mostly me, I'm the Software Engineer the rest are Media Designers) a pretty challenging task. We have been given a ...
1
vote
1answer
158 views
How can I 'bridge' and unbridge connections between two inputs
How can I make a non physical switch so that when in one state the two wires will be connected and in another they are not.
IE: Current going through into I/O 22 and being connected or not connected ...
1
vote
2answers
2k views
digitalRead sampling rate for Arduino Uno
I am attempting to send a character across the serial port when I press an external button the button is attached to the digital IO pin 3, I used the code from the SerialCallResponse example, and ...
0
votes
3answers
369 views
RS232 which pin i can connect together to receive a input signal in my Java application listening on ttyUSB0 or ttyS0?
I am trying to make a very simple BUTTON (simple wire RED/YELLOW only). Now if the Button is pressed (RED touch YELLOW) i want to receive input signal in my Java application (that button was pressed).
...
0
votes
3answers
301 views
Multiple pulses from single button press
I am working with a 74HC193 binary up/down counter, and am trying to set up a button to increment or decrement it. The procedure to increment a single step as I understand it is:
Set pin 4 high
...
0
votes
4answers
2k views
Multiple buttons on 1 analog VS one digital per button:Power Consumption
im working on a bluetooth watch project.
You may have already seen it on hackaday
http://hackaday.com/2011/08/23/bluetooth-wristwatch-based-on-an-arduino/
i kinda need to add some buttons onto the ...
0
votes
2answers
324 views
What kind of power supply should I be using to power the incandescent bulb inside the Big Dome Push Button?
I have a Big Dome Push Button as the activation switch for a photo booth project I'm working on. The problem is, I don't know how to power the incandescent bulb inside of it. I don't want to do ...
1
vote
1answer
105 views
Looking for buttons
I'm looking for similar buttons to this . A button where I can solder directly on the pcb. I plan to CNC mill out an acrylic bracket on top of this pcb, and was hoping i could just mill out a round ...
0
votes
4answers
240 views
Illuminating buttons
I'd like to add some kind of illumination to the buttons on my project. To that end, I was thinking of illuminated pushbuttons, with built in LEDs. However, the ones I found are very big (I'm looking ...
12
votes
7answers
2k views
Debouncing buttons
I recently read an article about button debouncing and was wondering if I should keep this in mind when working with, for example, an Arduino (ATMega mC)? I assume it is an issue, especially when ...
0
votes
5answers
4k views
Fix remote controller button contacts
On almost every remote controller the buttons stop reacting after a while, and you end up squeezing the remote out of his life while trying to switch the channel...
I found some link where it ...
4
votes
9answers
3k views
hardware for pushing buttons
Many times I want my computer to interface old hardware. Such as radio, light switch, etc. This mostly involves pushing pressing and moving various buttons and switches.
I don't want to buy new ...
1
vote
1answer
405 views
Spartan-3E to PIC16f887
I am a beginner wanting to know how to interface the spartan 3e board with the pickit2- PIC16F887. I have so far connected j2- pin a6(spartan) to port a Pin1 on the PIC, the ground Pins and j2 pin e7 ...
