Questions about button types, button debouncing, button interfacing, etc.

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1answer
51 views

Reading switches without a common ground from Arduino

I'm trying to interface a steering wheel control interface with an Arduino. The interface connector has 6 pins, A to F. These ...
0
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0answers
60 views

One-shot sound button/trigger for Arduino Sound Player

I've succeeded in making a simple Arduino ATMega328 sound player on my breadboard following this guide. . . http://highlowtech.org/?p=1963 http://playground.arduino.cc/Code/PCMAudio But, here's my ...
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vote
2answers
40 views

Custom push-to-talk button on a handheld two-way radio

I want to make my own PTT for this two-way radio. How can I determine how it is realized? I've figured out that the two "potential rings" with the biggest diameter on the 3.5mm and 2.5mm plug are ...
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0answers
53 views

Rubber button contacts for stripboard

How can I make button contacts on a stripboard (or any other kind of board)? They are meant to work with the black circular carbon conductors underneath the rubber keys on a gamepad (like this). ...
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2answers
175 views

PIC programming - Get value of multiple buttons to a port

I'm learning PIC (pic18f4550) and pretty new to microcontroller programming. I'm trying get value of three button on PORTA and send it to a 8x8 led matrix as X coordinates through a 74LS595. The ...
2
votes
1answer
93 views

Best way to short these pins?

The pins that the arrows are pointing to are for the power button on my camera. If I take a small piece of wire and touch the two leads (they seem microscopic), then the camera turns on and off. I ...
0
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1answer
56 views

specific type of illuminated push switch [closed]

(editing to try and remove from 'old hold' status) I've been looking for a specific type of push switch for a little arduino/pi project I'm working on - it's the sort of illuminated push switch that ...
2
votes
1answer
137 views

I need to replace this button in this circuit board with a relay

I have a circuit board with a button in it (the clear white button pictured below is the one I'm targeting). I need to somehow remove the button from the circuit and put a relay in it's place. I'm ...
0
votes
1answer
152 views

Launchpad MSP430 incremental blink with button

I'm new with this. I'm trying to make an incremental blinking LED with every time that I push the button, I'm using Energia and Launchpad MSP430, I don't know if somebody can give a example code to do ...
2
votes
2answers
121 views

How do I use a button to wake up an atmega32?

Sorry for any noobiness, I'm more of a software engineer. How do I use button interrupts in general? As in, if I put my microcontroller to sleep, I'd like a button to wake it up. How should I go ...
3
votes
1answer
82 views

Inverting SCR Action?

I'm curious if there is a way to reverse the way an SCR works(Current flow to load UNTIL a gate signal arrives). I think this would come in handy for a bunch of hobby circuits I may want to ...
2
votes
1answer
292 views

How to use MOSFETS for single-button on-switch and input signal to microcontroller [duplicate]

I'm trying to create a single button circuit for the purpose of both powering on a microcontroller (probably an arduino) and then allowing the microcrontroller to control its own power (power itself ...
0
votes
2answers
113 views

Detecting length of button-press using a microcontroller

I'm interested in creating a seek button panel (2 buttons - back and forward) that will connect with my Android's native music player, similar to the CD player in my car. I'd like for the buttons to ...
-4
votes
1answer
83 views

Where can I get a big, cheap, simple, push button? [closed]

Right now I have a circuit which connects a battery to a motor which propels an 80 pound robot forward. I'd like to add a simple pushbutton to the circuit that allows me to instantly make or break the ...
1
vote
2answers
83 views

6 way switch to USB card reader

I am looking for a way to redirect 6 pcb traces with a push of a single button. There is micro controller with a SD card connected and I would like to access the SD from a computer without needing to ...
2
votes
1answer
55 views

Coolpix L27 trigger mechanism

I plan to do a 3d scanner with low-grade digital camera. I opened a coolpix L27 and found this : Does anybody knows how this kind of button is called (may be it is normalised and finding a ...
0
votes
1answer
124 views

4 pin headset pinout / pushbuttons interface [duplicate]

You all know smartphone headsets. Most of them have a microphone integrated and additional pushbuttons for increasing/decreasing the volume or to pause the current track. I am wondering how this is ...
2
votes
0answers
180 views

Ardiuno Uno R3 Plus Digital Pins Overused?

I have an Ardiuno Uno R3 Plus with 14 digital pins, but they don't function well. Or maybe they do, but the point is, I think I am overusing them. I have an LCD connected to ports 13-7, 4 LED lights ...
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vote
2answers
219 views

Launchpad blink with button

I am trying to make LED in MSP430G2 Launchpad keep blinking / off with button like Switch example (http://www.arduino.cc/en/Tutorial/Switch) in Arduino/Energia but I seem to miss something stupid and ...
1
vote
2answers
114 views

Circuit for 2 Switches and 2 LED's

I have a circuit with 2 switches and 2 LED's. I want to control one LED with 1 button (which is a simple circuit). But I also want to turn off one of them, when the other is On. Is there a simple way ...
0
votes
1answer
96 views

ATMega32, Using PORTA as digital io has digital “crosstalk”

I have multiple switches connected to portA on an atmega32. They are set as an input with internal pullups. There are no external pullups. The switches ground out the pins. I'm not debouncing the ...
1
vote
3answers
155 views

Limit Number Of Pulses From 555 Or Similar

I need as small a circuit as possible that can produce 2 pulses (say maybe 200 milliseconds long and apart) when I press a button. My thought was to use a 555 timer and set it up for my desired pulse ...
0
votes
1answer
66 views

Circuit to emulate 2/3 button presses

I am attempting to build a simple circuit to to control sound on my Android phone. All the controls are accomplished by tying a control pin to ground, so all I do in between is just about resistance ...
0
votes
2answers
119 views

Solteam switch with 5 pins

I am very new to electronics, learning by my own. I extracted a lot of switches, buttons and other components from old computer parts, and now I am wondering can I use this as direction switch for ...
4
votes
4answers
281 views

Will I need diode if I add button to this schematic?

Here is some pre-story. I removed ignition switch in my car which had five wires connected to it (accessories, ignition, starter, +12V for ACC&IGN, +12 for STARTER), and connected the wires to the ...
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0answers
32 views

Trigger button press via mspdebug

I am experimenting with a MSP430 (inside a eZ430 Chronos), and I’d like to debug my code while the device is attached to the USB debug board. It seems that the buttons do not work while the device in ...
1
vote
0answers
982 views

How to wire a button for input on an Attiny85 using Arduino code?

I am trying to "shrink" my arduino project to an Attiny85. But for some reason I cannot get an input button to work on the Attiny85? To simply the circuit and to make sure I didnt make a mistake ...
2
votes
3answers
108 views

Finding a small, low-actuation pushbutton

I'm looking for a small kind of pushbutton that I'm not even sure exists. I want it to have these properties: ...
0
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0answers
95 views

isolate switches in resistor ladder

I am looking to re-purpose some automotive switches in a project. My goal is to extend or relocate the buttons of a garage door opener to my dash board. The buttons on the dash board have 3 ...
2
votes
4answers
745 views

How do emergency stop buttons work?

When using emergency stop buttons and kill switches, are they designed in such a manner in which their role is more physical, such as interrupting a power supply (apparently in some of the models, ...
6
votes
1answer
319 views

How to get 1-button-press to output 1-“active”-tick according to a clock

Background: I'm a software engineer with only a little knowledge of circuits--all informal--trying to build an 8-bit sum-carry binary calculator from basic logic gates. Question: Are there well-known ...
2
votes
3answers
143 views

Looking for an inexpensive button that can withstand hits from a baseball bat

At work, we're decomissioning a pile of servers. However, they are all virtual, so we can't celebrate office-space style. However, I was thinking - if I could hook up something that acted like a ...
2
votes
1answer
137 views

cooktop touch buttons [duplicate]

How cooktop buttons works? In this picture can see circles (marks) from control board. Here are control board with buttons. If i touch that black "buttons", it is like dish wash sponge. How that ...
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votes
1answer
106 views

Need help in ID'ing a push button type

Can someone ID thing button for me? I need to replace it and not sure what to buy. It's burned out so i cannot with a meter to figure it out - it's not doing what it's suppose to.
0
votes
1answer
80 views

Switch and Pushbutton Combo

In a circuit I'm designing I want the user to be able to switch the power off and on (with an SPST style switch), as well as depress a push-button (push-to-break) that will temporarily disable the ...
4
votes
2answers
359 views

How can a shift register be used to debounce a switch?

This is the problem: This is the proposed solution: What I don't understand: The button bounces in the setup/hold time of the input of the circuit, making the FF go into a metastable state ...
-3
votes
1answer
675 views

Push button switch plus 10 LED's

How to insert a push button switch in this circuit? 6 Volt Power Supply 10 LED's 10 resistors. I can do it with just one resistor and 10 LED's. I have a 6 pin push button switch. Here's my circuit ...
0
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1answer
217 views

why and how do I use a capacitor in a switch circuit?

I have seen many designs of switch circuit: I know that a capacitor will help anti-shake but I realy do not know how i can anti-shake. Does it work like a decoupling capacitor or a low-pass RC ...
6
votes
3answers
201 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
139 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
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1answer
2k 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
165 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
2k 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 ...
8
votes
2answers
284 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
102 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
837 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 ...
7
votes
5answers
583 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
604 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
1k 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
602 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 ...