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

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1answer
30 views

arduino boot up button and shutdown mode on regulator

We've a projet with an important autonomy concern. We use an homemade arduino (atmega328), and for the moment we're using interrupts on buttons to wake up the atmega. so we have: sleep ->(button ...
0
votes
1answer
51 views

Momentary Button as Switch

I have a project that uses a computer case and PSU, but not motherboard, to turn on the PSU, all we know is to put green cable to GND. The problem is the ON Button, it's momentary and I need to keep ...
0
votes
1answer
34 views

Latching push button with electronic reset [closed]

I'm looking for a latching push button switch that can be reset electronically. After much searching I managed to find this post: Resettable mechanical switch? which links to this switch: ...
1
vote
1answer
58 views

capacitive sensor and wire length

I'm a newbie and I've been playing with the awesome Adafruit CAP1188 capacitive touch gizmo. As long as I keep the length of the wires from the CAP1188 to my copper sticky pads to a couple of feet, ...
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4answers
174 views

6 Buttons, 2 Wires, 1 Microcontroller

First off I should probably mention that I'm a beginner when it comes to electronics. I am planning on adding some buttons to a controller but have limited space for wires. Only 2 of the wires I have ...
2
votes
3answers
99 views

How to create a locked door detector?

I'm trying to build a device that alerts me when I leave home without locking the door. I have a little space inside the door (width 8mm x height 130mm x depth 8mm) where I plan to install the ...
1
vote
3answers
37 views

Reducing parasitic capacitance in momentary latching circuit

I'm using this circuit (http://www.edn.com/design/power-management/4427218/Latching-power-switch-uses-momentary-pushbutton) to get latching on/off behavior from a standard momentary switch (an Omron ...
2
votes
2answers
44 views

How could I make a water-resistant touch/tap sensor (similar to push button) for all-weather outdoor use?

I am building an Arduino-based device to be used outdoors (on a bicycle), and it is expected to work in all weather conditions. The device will have some buttons to turn lights on and off, honk the ...
2
votes
2answers
447 views

How does this button work without any circuit closing device?

This may be a stupid question, but I have searched online for a little bit and can't seem to find my answer. I am working on a circuit board that uses buttons that i've never seen before. These ...
0
votes
1answer
48 views

Can you help me find the part number for this push button cap? [closed]

I've been searching high and low for the part number and manufacturer for this button cap. I've tried it out and it works perfectly for my project. Note: I do not want the button itself, as I've ...
1
vote
2answers
126 views

Need to get more analog inputs Arduino Uno

Im making BattleShip on the Arduino: 2 x grid ((10x10 push buttons) + (10x10 led 5mm)) 2 x grid ((10x10 reed switches) + (10x10 led 5mm)) I made a 10x10 grid of push buttons by setting 10 buttons ...
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2answers
65 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
65 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
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0answers
37 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
60 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
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3answers
219 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
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2answers
138 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
1k 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: ...
0
votes
1answer
79 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
69 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
65 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
109 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
706 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
129 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
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1answer
43 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 ...
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3answers
182 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
119 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
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2answers
88 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
100 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
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3answers
221 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
315 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
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0answers
55 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
93 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
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3answers
463 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
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3answers
154 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
268 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
153 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
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2answers
97 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
117 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
617 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
430 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 ...
1
vote
2answers
459 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
106 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
64 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
365 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
559 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
680 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
105 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
1k 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
277 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 ...