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

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136 views

Why use a resistor for Pull-Up?

I just got my first Arduino and had a question about pull-up resistors. I was trying to connect a push-button to the Arduino at pin 2, and if it's HIGH then I write HIGH to pin 13. Now, in the ...
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0answers
49 views

A small board with button, pull-ups and capacitors [closed]

Gentlemen! I need a button that is already soldered on a small PCB with all other parts: capacitors, pull-ups, etc. Cannot you advice me one? I need it for fast prototyping purposes in order not to ...
0
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3answers
116 views

What are the mechanisms at work in a pull-up or pull-down resistor circuits with a push-buttons and a GPIO?

I have a question regarding the GPIO (from a Arduino board for example). How does it work exactly when you use it as an input pin? What are the mechanisms at work when you use it in a pull-up and ...
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0answers
40 views

Two Sided Push Button Latch

so I have here a push button latch that is tried and tested and that works beautifully. But I need help making a variation of it that will switch between two circuits instead of just turning one ...
0
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1answer
47 views

Microcontroller self-shutdown with MAX682

I have read How to implement a soft power switch controllable by microcontroller? and am wondering if something similar would be possible with a MAX682. What I want, is a device that is turned on by ...
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3answers
136 views

I'm trying to implement interrupt from RB pins. But it doesn't work

I'm new to PIC programming. I made a program to get interrupt from RB pins. but it doesn't work. My code is as follows: ...
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3answers
99 views

Double tap push button which resets if not pressed twice in quick succession?

I'm new to electronics, so don't know where to begin - I'm trying to create a push button which needs to be pressed twice in quick succession, to actually power on a device. Pressing it just once, or ...
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2answers
97 views

How do I simulate a physical push button from an AVR

I've been messing a bit with EL wire that I purchased from amazon, I dissected the control unit and it appears to consist of a transformer, timing circuits(s) and a push button. When you push the ...
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1answer
106 views

Self-made Arduino pushbutton bank not working

So I'm trying to make a 5 key keypad like circuit, but with increased tactile feel, so I forwent actual store bought pushbuttons. I rigged up keys with some aluminum foil and pieces of plastic and ...
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2answers
76 views

Push button switch terminology question

What is the proper term for the upper part, the one we push on push button switches? Is it button or knob (I also saw it referred as head and actuator)? I am asking because I want to buy some for a ...
0
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1answer
87 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 ...
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0answers
239 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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2answers
144 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
62 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
308 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
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1answer
97 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
62 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
180 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
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1answer
375 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
264 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
88 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
571 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 ...
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2answers
173 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 ...
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votes
1answer
96 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 ...
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2answers
101 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
56 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 ...
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1answer
177 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
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0answers
207 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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2answers
411 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 ...
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2answers
136 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
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1answer
103 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 ...
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3answers
230 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
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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
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2answers
154 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
359 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
37 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 ...
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0answers
2k 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
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3answers
118 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
105 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
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4answers
1k 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
520 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
148 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
171 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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1answer
114 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
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1answer
87 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
658 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 ...
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1answer
944 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 ...
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1answer
294 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
244 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
140 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 ...