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

learn more… | top users | synonyms

-2
votes
0answers
34 views

Laptop power button not working. Where should i look? [on hold]

Hello i'm trying to fix my laptop's power button. The button is attached into USB adapter module. I checked switch and all connecting pins to motherboard with tester (connection was solid and well). ...
1
vote
1answer
74 views

Convert capacitive touch sensing back to mechanical switches?

Capacitive sensing seems to replace often mechanical switches. Is there a way to convert them back to mechanical switches? Problem at hand is a cooking device with interfaces with the user via the ...
0
votes
0answers
16 views

Arduino with multiple buttons - will power be an issue? [migrated]

I have a, hopefully simple, question related to creating a circuit with an Arduino board; feel free to dismantle the idea, I'm, unfortunately, not well-versed in electronics. I have a spare Arduino ...
0
votes
0answers
25 views

Why doesn't this debounce function work? [migrated]

A little while ago I made a function to debounce a button and return its value. The void loop then read the button to know whether or not to blink the LED. It worked perfectly. I am now using this ...
0
votes
5answers
64 views

Is there a device that can push down on a button with a wireless remote control?

I'm looking for a device, perhaps one that releases a small piston, tiny object, or block, that can press down on a button via wireless remote control. The button is about the size of a dime, and is ...
0
votes
1answer
50 views

Trigger capacative button

My washing machine is equipped with a capacitive start button. A "button" is marked with paint on the plastic front and on the backside of the panel there is a spring extruding from the control PCB, ...
-1
votes
1answer
70 views

Sharing a pushbutton with multiple boards

I would like to have several identical boards (arduinos) each with its own power supply, and daisy chained with some wiring, each board being able to receive a signal to an input pin when a pushbutton ...
1
vote
1answer
164 views

MCU push button triggered by electrostatic discharges

In a simple project based on an STM32 microcontroller, I needed a couple of extra push buttons. So I connected each button between a pin on the STM32 and GND, configured the pins as input and ...
3
votes
1answer
53 views

Best way to multiplex button lines on existing circuit

I have a target device that has push buttons that when pressed send a constant 3.3v signal to the MCU button input GPIO's until released. Externally from a different device (perhaps a Raspberry Pi) I ...
0
votes
0answers
52 views

Reset button from Playstation 1 is always connected.. even when clicked?

Hopefully you can help me with my small project here. I am currently trying to use this switch from my Playstation 1 as a.. button, basically. What I want to do is complete a circuit when the button ...
1
vote
4answers
110 views

Create binary sequence to use less inputs

Let's say I have 63 buttons, but there are only a few inputs on Arduino. I want to know which one was pressed. To minimize the number of inputs used, I could tell from a binary sequence. If I press ...
-1
votes
2answers
100 views

How to make a USB Circuit board with 176 button? [closed]

I just want to make my own Piano 88 key (176 button), each key should have atleast 2 buttons to calculate velocity, Circuit board should send a message to a computer through USB like this : "1 200ms" ...
0
votes
0answers
66 views

What are my options to force this intervalometer light switch on?

Attached is a photo of the innards of a 'Calumet Pro Series Digital Shutter Timer Controller' (aka 'Intervalometer'). The top left button, marked 'SW7' controls a backlight for the LCD display. ...
1
vote
2answers
84 views

Close/open a physical button circuit via Arduino

I have an electronic dog door that is triggered by an ultra sonic collar on the dog: Electronic Dog Doors are NOT All Created Equal The end game is to be able to trigger this door using an ...
0
votes
1answer
72 views

Connectors on Device prototyping

I´m drawing my own PCB and I´m searching for components to use for this purpose. Since I´m not an expert in this fields, I have some unsolved questions: (I´m using Eagle Cadsoft) I need to create a ...
2
votes
2answers
242 views

Can I use a button in place of a clock crystal?

So basically, I'm wanting to finally get into electronics. A little while ago I bought a few MCP3008 chips and analog pressure sensors. I've been wanting to build an compressed air system with it. ...
-1
votes
1answer
25 views

Modelling switches & time in NGSPICE

I want to model the behaviour of a circuit in response to 'pushbutton' actions by a user. That is, Initial state; Simulate momentary button press & new state following; Likewise with a ...
0
votes
1answer
71 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
86 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
73 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
261 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, ...
0
votes
4answers
207 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
162 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
72 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
103 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
582 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
55 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
182 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 ...
0
votes
2answers
98 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
93 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
67 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
103 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
633 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
353 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
3k 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
123 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
77 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
196 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
935 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
194 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
50 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
245 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
190 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
97 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
145 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 ...
1
vote
3answers
302 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
461 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
1answer
111 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
632 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
192 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 ...