Questions tagged [debounce]
When a mechanical switch closes it's contacts typically do not close "cleanly" and tend to bounce or chatter. This rapidly switching signal could be misread in certain situations so it is usual to attempt to reduce this bouncing to ensure a clean switch detection. the danger is that if the switch is not de-bounced you can detect multiple events from one opening or closing. Can be accomplished using analog circuits or digital circuits.
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Issues with switch debouncing
I am having some issues with debouncing a switch with an RC filter and 74HC14 Schmitt-trigger inverter IC. I am using a standard circuit that is linked in the datasheet. The circuit in question here ...
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STUSB4500: Contact Ground Issue
I'm working with the STUSB4500 for USB PD Sink. My PD circuit is the same as the Sparkfun Power Delivery USB-C board, and everything works well, except for the fact that the ground is super sensitive ...
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How do I flash LED with signal from 555 timer ONLY when button is pressed?
I am trying to make a circuit in which an LED is off until a button is pressed, and then it flashes with a 1Hz signal from a 555 timer. Currently, its default state is flashing with 1Hz and when the ...
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How does this debounce circuit (from Arduino Portenta Edge Control) works?
I stumbled upon this part of the schematic (page 2) of the Arduino Portenta Edge Control (shown below), which – in my eyes — seems to be a debounce circuit, but more complex than the one shown in this ...
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LS19-S, what to do with unused inputs>
I am using a LS19-s switch debouncing IC, and the datasheet does not specify what to do with unused inputs. I know for CMOS chips it standard to ground unused inputs and for TTL chips the unused ...
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Should I debounce everything?
I am a newbie in electrical engineering and recently learnt about debouncing. While it's obvious why I should debounce a push button that is connected to a microcontroller, I'm wondering why there are ...
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Triggering a signal on the falling edge of an input, and not re-triggering when it stays low
I have a 555 in monostable mode that will generate a signal from the transition to low from one of it's inputs (as they do). The issue I have is that the trigger will out last the signal by an order ...
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Should I buffer my switch button input?
I have external switch with 24v/open circuit.
I think that I only need voltage divider and drive the FPGA input, but something feels weird for me, maybe I need some capacitor for noise? maybe some ...
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Is debouncing necessary for a power switch?
A few months ago I asked for help designing a circuit for powering on a microcontroller using a tact switch, and I finally just prototyped the circuit that @Jonathan-S. suggested. It works great. ...
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Debounce switches on car stereo bluetooth receiver
I have retrofitted a Bluetooth receiver to an old car stereo, replacing the cassette. Although this generally works fine, there has been some issues with the three play-pause/ff/rw momentary switches ...
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Why does my switch debouncing circuit still result in occasional false presses?
I have an issue where my switch debouncing implementation isn't working. I have a custom STM32 board with switches connected to an interrupt pin on the STM32. The pin is configured to be interrupt on ...
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How to debounce a normally closed switch?
The 74LS192 IC's up count (pin 5) needs a logic 0 in order to count up. I'm trying to debounce the switch so that it doesn't give multiple inputs to the IC.
I've tried this circuit that is used for ...
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Is this a functional debouncing circuit?
Is there anything wrong with this debouncing circuit, aside from the fact that it can be made with a single Schmitt trigger and a capacitor that is charged when the button is not pressed?
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Edge detection circuit causing multiple inputs
I am trying to build a shift register using only 2 inputs - a button to enter high, and a button to enter low. Since I'm not using a separate button for the clock, I need to make an edge detection ...
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How to connect an EC11E rotary encoder to a microcontroller?
I'm connecting a EC11E rotary encoder to a Adafruit Feather 32u4 Bluefruit LE. The EC11 has 5 pins: 2 for the switch, and 2 for the knob.
Connecting the encoder itself would be easy, but I'm having a ...
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