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

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2answers
160 views

How does this simple contact debouncing circuit work?

I made a contact debouncing circuit using a capacitor. The main idea was to charge the capacitor, so that the bouncing on the signal would be "smoothed out". It works, but It's been a while since I ...
0
votes
2answers
47 views

What to make of this strange snap dome switch configuration?

I'm trying to figure out how to interface a microcontroller with a cheap MP3 player that used snap domes for buttons. I do not have a datasheet for anything on the MP3 player board, because I can't ...
0
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2answers
43 views

Buttons for a timing game

I want to create a game with arcade style buttons using arduino. I know there are simple loops you can have to check for a button closing a circuit, but if buttons are checked sequentially in an ...
0
votes
3answers
91 views

Hardware buttons debouncing crosstalk

I'm using a hardware-based debouncing circuit to trigger an interrupt on a Particle Photon development board. I use a similar circuit with two buttons: Sometimes when a button is pressed, the ...
0
votes
3answers
84 views

Rotary encoder to 2 buttons

Please excuse me if this question is a very obvious one, I have searched on here but my electronics knowledge is very very basic. Here's what I'm trying to do, I have taken an old Android phone ...
20
votes
3answers
1k views

What's the purpose of traces that are later punched out?

I've found this odd feature on an FPC in a Camera than handles button and switch input. You can see there are traces that look like they were once connected and later punched out to be cut. The one ...
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votes
5answers
105 views

Arduino power on button problem

I am trying to build a circuit that will allow my arduino board to be turned on by a button (switch). Much like a power button on PC. Here is my schematic. In real life I used a phone charger ...
0
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3answers
96 views

Digitally Pressing a keyfob button with a microcontroller

For a project I'm working on, I need to press a car keyfob button with a microcontroller. So I soldered two wires to the circuit thing on the keyfob so I can send signals to it. This is what it ...
2
votes
1answer
54 views

Making a positive edge clock pulse with a button?

Is it possible to have an input, say a button, that does one positive edge clock pulse? So I want to press this button once and it does a 0->1->0. I can't think of anyway to do it because it changes ...
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votes
1answer
114 views

Detecting open circuit, very low power

We need low power consumption (1nA - 1uA) while the circuit is closed, and then wake the microcontroller when the circuit is opened. A the moment the design includes a custom metal switch which will ...
1
vote
1answer
111 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
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5answers
204 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
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1answer
57 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, ...
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votes
1answer
72 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
224 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
67 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 ...
1
vote
4answers
120 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 ...
-2
votes
2answers
142 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" ...
1
vote
2answers
138 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
81 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
252 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
30 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
103 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
110 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
127 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
410 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
257 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
377 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
100 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
170 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
686 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
64 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
213 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
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2answers
114 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
121 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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2answers
142 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
1k 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
686 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
5k 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
172 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
86 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
294 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, ...
6
votes
1answer
1k 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
234 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
53 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
280 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
251 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
102 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
165 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
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3answers
488 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 ...