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

learn more… | top users | synonyms

0
votes
2answers
40 views

How to use CR2032 button cells for excitation of load cell

I am using a load cell that required 9-12V excitation voltage. Can I use a few, say 4 CR2032 button cells to generate 4x3V=12V of excitation voltage for the load cell? I could also use a 9V batter. ...
1
vote
1answer
49 views

How to create an on/off indicator for a SPST in a circuit?

I've recently started to work with electronics and I'm truly a beginner. Our teacher asked us to create an on/off indicator for a SPST button in a circuit. When the button is pressed the green light ...
0
votes
0answers
27 views

Wire button to hall-effect sensor

I'm a little stuck at the moment. I'm trying to wire paddle shifters to my car and the only way to do so is the hard way by wiring the paddles directly to the sequential output on the gear selector. ...
0
votes
2answers
44 views

Replace 5-pin push button in my laptop [closed]

I have a 5 pin push button in my laptop, that doesn't work. I have to replace that button, but in my town I don't have any in stock and I can't wait for the delivery from China. How can I replace ...
0
votes
3answers
90 views

Wiring Emergency Stop button to disconnect two independent circuits

I am trying to use one emergency stop switch to disable two batteries that function in independent circuits. My circuit diagram is attached below. A motor controller connects to each of the exposed ...
0
votes
2answers
76 views

How should I connect / design this tactile push button on PCB & schematic?

I have need for a tactile push button that I am using to cause an interrupt on a microcontroller. I have found my desired switch (linked above) but I am having trouble deciding the best way to design ...
2
votes
4answers
375 views

Understanding interrupts and software button debounce

I'm quite new to AVR programming (avr-gcc). To react on button-press, I am using a PCINT ISR with the internal pull-up resistor enabled like this: ...
1
vote
1answer
58 views

Wireless Panic Alarm

I have made a panic button with a simple circuit with a wireless doorbell button connected wirelessly to the chiming box with the output of that connected to a relay powering a 12v flasher and siren, ...
1
vote
1answer
45 views

Touch control hob (electric stove)

I have a hob with the touch button but not responding enough. It's a Fujistu Siemens. The touch buttons are cover by aluminium case. In the image above that is touch button. If I can say is a touch ...
1
vote
1answer
52 views

Magnetic contact circuit

Which is the best circuit for using a magnetic contact for turning on a LED strip? I would like to turn on a strip led with 12V 7A battery, but: 1 - if I use only the magnetic contact it will be ...
1
vote
0answers
60 views

Convert a NO push button into an On/Off button

I'm building a boombox, and it needs a couple of switches for main on/off, voltmeter on/off and LED lights on/off. Since I don't have any metalworking tools I am going to buy a premade front panel, ...
5
votes
1answer
588 views

Rubber push-button

On lots of electronic devices, such as this Korg drummachine/sampler, there are some soft rubber push buttons. What are they called? (I'm looking for the most common name, so I'll can find them ...
2
votes
3answers
94 views

How do I detect human touch on a point on the PCB?

I want to print buttons in the silk screen of one side of the PCB. And, I want to detect if a human finger touches any of these areas. What kind of sensor should I use? Can I do this without using a ...
0
votes
1answer
32 views

flow power around button laser module circuit

I have a red laser pen module: http://space-linker.com/Uploadfiles/UploadFile/2010178127739.jpg I want to be able to have it always on. How can I short the button, without having to glue or tape it ...
1
vote
3answers
128 views

How to programatically simulate a click on a capacitance-sensitive button?

I am tearing apart a SONY HT-XT1, which has capacitive buttons to put it in a different case for a project: I've taken it apart already and am now met with a motherboard with 3 pads on it. Touch ...
2
votes
2answers
85 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 ...
1
vote
2answers
86 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
72 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
203 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 ...
1
vote
3answers
251 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
51 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
76 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
367 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
133 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
175 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
147 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
86 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
106 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
516 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
289 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
69 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
407 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
101 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
273 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
527 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
537 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
101 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
910 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
232 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
110 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
126 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
57 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
303 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 ...
3
votes
1answer
295 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
539 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
165 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
112 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
296 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
71 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 ...