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

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2
votes
2answers
49 views

Using a toggle switch to act as push button

Basically I want to use a toggle switch to turn on my computer. I need some sort of circuit so that the toggle switch will act like a push button. IE, I turn on the toggle switch but it only sends a ...
0
votes
0answers
25 views

Multi Circuit Button [on hold]

I'm a complete beginner in terms to electric circuiting. I'm trying to add a additional audio circuit to a toy but still use the buttons and circuit already there. Before I try I just want to ask, can ...
0
votes
0answers
38 views

Bluetooth keyboard button lost. Turning it on without a button [closed]

I lost my power button on my hp bluetooth keyboard. How do I turn it on without a button? I have tried to tip it with my key and pencil, but it doesn't work. EDITED: I did try to swap the button ...
1
vote
2answers
81 views

Standard SMT button size? [closed]

I need an SMT pushbutton on my PCB. I'm drowning in options on Mouser and just want to select something that is future-proof. Is there a standard size and footprint for pushbuttons that I can use to ...
2
votes
0answers
35 views

Combine Bluetooth Buttons (Volume up / Next, Volume Down / Previous)

I have a question regarding the control of a bluetooth device, which I would like to connect to some old headphones. Bluetooth SMD Module - BC127 There are some pins on which I can connect the ...
0
votes
3answers
158 views

Why use a resistor for Pull-Up? [duplicate]

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 ...
0
votes
3answers
143 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 ...
0
votes
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
votes
1answer
61 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 ...
0
votes
3answers
184 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: ...
0
votes
3answers
104 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 ...
1
vote
2answers
113 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 ...
0
votes
1answer
135 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 ...
1
vote
2answers
79 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
votes
1answer
91 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
votes
0answers
302 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 ...
1
vote
2answers
171 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 ...
0
votes
0answers
64 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). ...
1
vote
2answers
333 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
100 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
votes
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
194 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
414 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
331 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 ...
4
votes
1answer
94 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
668 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
185 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
98 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
107 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 ...
1
vote
1answer
192 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
240 views

Arduino UNO R3 Plus Digital Pins Overused?

I have an Arduino 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 ...
1
vote
2answers
446 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
141 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
105 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
242 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
67 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
166 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
400 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 ...
0
votes
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 ...
2
votes
1answer
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
votes
3answers
119 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
votes
0answers
109 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
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
559 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
149 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
184 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 ...
-1
votes
1answer
116 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
89 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
717 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 ...