Questions tagged [debounce]

Contact bounce (also called chatter) is a common problem with mechanical switches and relays. Debounce or debouncing is an a hardware or software technique to eliminate this effect.

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Toggle button switches through case statements with button debouncing

The overview of my code is that I want a toggle button to be pushed and each button push will move the code to the next case statement. In each case statement, there will be different LED functions. I ...
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Push button unexpected increment/decrement. I'm using attachInterrupt

I'm new to Arduino and need assistance from knowledgeable people. I'm having a problem with my code, which allows the user to increase or decrease the number by pressing buttons. From time to time, ...
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Serial.print() Inferferes with my digitalRead()

I'm running into issue properly reading a button connected to a digital I/O pin on my Adafruit Feather HUZZAH ESP8266 device. I've implemented the debouncing script exactly as the Arduino provided ...
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Basic hardware debouncing

I was watching Jeremy Blum's Arduino tutorial series, and he explained the need for debouncing in a simple circuit involving a pushbutton. Pressing the button once should mean the led stays on, and ...
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Debouncing interrupt using capacitor

I'm currently working on nodeMCU and need to use interrupt pin. I find out there are bouncing problem when using interrupt thus i use capacitor 100uF to solve this problem. The question is by using ...
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Please help with my tinkercad code. Debouncing stopwatch with lcd

#include <LiquidCrystal.h> LiquidCrystal lcd(12, 11, 5, 4, 3, 2); int ssPin = 8; int resetPin = 9; bool cntrRunning = false; int sec = 0; int min = 0; double currentMillis; void setup() { ...
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Understanding Debounce code

I don't understand the following Debounce code. (The complete code is at the bottom.) From what I understand, when the pin reads something, we wait at least 50 milliseconds before performing anything. ...
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2 votes
1 answer
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Problems with detecting button digital state

I am trying to start an event after pressing and holding the FLASH built-in Nodemcu button for a specific time, I wrote two functions, one for debouncing and detecting the state, the other is to ...
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Debouncing Switch Issue

I’m trying to use a LDR to monitor the light levels and if the LDR is covered and the button is pressed, the LED should switch on. I’m in the process of adding debouching but every time I run the code,...
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How to add indicator lights to button sketch

I would like to add leds to each button switch in the first code, The first code sends midi messages to a DAW I would like it to also turn on a led as an indicator light. The switch needs to turn the ...
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24/14 second countdown timer or shot clock for basket ball start/stop button doesn't respond well

Start button doesn't respond correctly, i can't figure out whats wrong with the code ? pls help, this code is for 24 second and 14 second countdown timers in a same unit comes with three physical ...
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Measure revolutions per second with reed switch

I'm trying to measure speed of a fly wheel with a reed switch with one magnet (1 pulse per full rotation). I have an 100nf cap connected to switch to help with debounce. #include <Arduino.h> ...
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3 votes
2 answers
10k views

Debouncing a button with interrupt

I tried to follow the answer here: https://arduino.stackexchange.com/a/18545/51302 Unfortunately I can only get the interrupt to go once (on serial monitor is the time of that first interrupt), then ...
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Code test the duration press of the button

I wrote code that tracks the duration of a button click. It has bounce protection and frequent clicks. (Freeze) My code: bool freeze_time, btn_read, debounce; unsigned int freeze_timer, btn_timer; #...
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Will a simple RC filter work with my mechanical rotary encoder, or do I need a Schmitt trigger?

I bought some incremental rotary encoders online https://www.bourns.com/docs/Product-Datasheets/PEC12R.pdf The spec sheet for those suggests a filter circuit for the outputs of the encoder that ...
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Reading a rotary encoder using digital pins of Mega 2560 directly using port registers?

I'm trying to write an interrupt service routine for an Arduino Mega 2560 to decode a quadrature rotary encoder. I've got an ISR (Interrupt Service Routine) that responds to the falling edge of ...
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Elapsedtime variable not resetting

I am new to Arduino programming. Let me describe the application I am working on. I am pressing a button for a certain period of time (30 sec). I can not hold it in a pressed position for all the time....
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Custom Debounce Code Not Working

It's my custom debounce code It keeps the led on by flipping the required threshold value when triggered after the led has turned on to keep the led in a high state and vice verse triggered again, ...
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Control multiple LEDs with multiple buttons

Problem 1: LED1 needs to be on only when button1 is held down. Right now it takes several presses to turn on and off and stays on. Problem 1: LEDs 2,3,4 do not turn off with buttons 2,3,4. They are ...
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4 votes
2 answers
690 views

Interrupts: use of the "volatile" keyword with a structure pointer for button debounce

I've written a small sketch targeted at the Arduino Uno (ATmega328P) to debounce a mechanical pushbutton using the summing/integration technique: #include <IntegratingDebounce.h> #define ...
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minimal code for multiple buttons de-bouncing

i have 4 buttons attached to 4 pins configured as inputs with internal pull-up activated... is this function sufficient to get a debounced state of the pressed button? byte buttonPressed(){ byte ...
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Debouncing Multiple Buttons

I'm creating a binary calculator with my Arduino. This will take two different binary numbers and add them together. I am focusing right now on the Byte One Input screen. For this, I can use two ...
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Why can I measure two pins simultaneously?

I would like to do an action if both buttons on my arduino pro micro are depressed simultaneously. I'm getting some strange results: // Buttons Bounce button0 = Bounce(); Bounce button1 = Bounce(); ...
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1 vote
2 answers
530 views

State Machine Logic problem with added states monitoring safety switches

I have been working on getting a state machine to work correctly but am having trouble with adding in the last bit of logic. What it needs to do is several things: Read two button inputs. Make sure ...
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3 answers
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Problem with Dual Safety Switches Initiating Timed Relay

I have been working on an Arduino project that has me kind of stumped. What it needs to achieve is that two momentary safety switches need to be pushed and held within a specified time frame as ...
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Soft debouncing from an interrupt during stand-by

My current setup has the arduino in 'stand-by' power saving mode, therefore i am unable to use any means of a traditional soft debouncer, such as Bounce2, as far as I know. I went ahead and attached ...
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2 votes
2 answers
282 views

Avoiding false rising and falling edge when using demultiplexer

I have 8 sets of 8 push buttons. There is a Teensy and a demultiplexer. The demultiplexer has 8 outputs. When an output is selected it is pulled low. Each output is connected to a group of 8 push ...
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4 answers
518 views

Debouncing, or problem with my code?

I'm using a simple microswitch on pin 2, to activate an external interrupt. void pause() { Serial.print("\n\nPause\n\n"); delay(1000); } void setup() { pinMode(2, INPUT_PULLUP); ...
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2 votes
1 answer
1k views

Interruption triggered twice when set to FALLING

I have a simple sketch with a button that triggers an interruption set to happen when the button pin goes from HIGH to LOW. It has debouncing so no repetitions happen when the button is pressed, but ...
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2 answers
820 views

How can I make this button toggle the position of a servo?

I am trying to make something so when I press the button it sets the position of the servo to 50 and then when I press it again, it sets it to 150. The button is momentary not a toggle switch. This is ...
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3 votes
0 answers
2k views

Encoder + Bounce2 Library

I am working towards debouncing my keyes rotary encoder using the Bounce2 library found here ( https://github.com/thomasfredericks/Bounce2 ). I believe the problem lies in my code as there isn't much ...
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1 vote
3 answers
228 views

Help Improving Debouncing

In short, I am attempting to debounce several buttons using something like a while loop instead of delays. This code runs in a box with a series of buttons on it, if the correct sequence of buttons ...
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1 answer
196 views

Servo Speed Changer with Buttons

ok so yesterday i was in trouble with the buttons, with help from you i got over it and everything worked fine with the 1st speed of the servo, then i added the other 2 speeds and it looks like it all ...
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1 answer
2k views

Rotary Encoder problem with LCD Display

Program reads rotary encoder correctly without bouncing in this code: int val = 0; byte clkPin = 3; byte dtPin = 2; bool lastClk; bool lastDt; void setup() { pinMode(clkPin,INPUT); pinMode(dtPin,...
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0 votes
1 answer
539 views

Instantiating bounce library inside a class

I am trying to get my head around how to instantiate objects from existing libaries inside a class object. Specifically I am trying to get the bounce2.h debouncer working. At the moment my code ...
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2 votes
4 answers
912 views

Why doesn't this debounce function work?

Edit 2 I made a function that works, but I'm still confused about just one thing... I'm very confused about how variables work in C++. In this program... boolean debounce(void) { static ...
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2 answers
1k views

Two commands in Void loop?

So basically I'm making 2 buttons turn on and off 2 different LEDs using debounce. I got that settled with one button to turn on and off 1 LED. But how do I make it so I can use the same lines but ...
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1 vote
2 answers
1k views

Instead of 1 and 0, make display say On or Off

So for my project, I am making a button that turns on and off an LED, but also display the state of the led on an LCD and by Serial. But my issue is, I don't want it to just show a 0 or a 1, I want ...
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2 votes
1 answer
920 views

Arduino sending keystrokes via push-buttons. Proper bouncing and manually setting buttons?

I have a simple set of 8 push buttons wired to a Teensy 3.2 board (which uses Arduino via Teensyduino plugin). The 8 buttons are on pins 1-8 and their common ground line (one line soldered to each of ...
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2 answers
3k views

How to simulate delay() to debounce mechanical button using millis()?

Im trying to use the millis() function as a replacement for the delay() function in order to debounce a mechanical button. This is for an electric drum kit I am building. Im using a teensy Arduino to ...
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1 vote
1 answer
909 views

Debouncing a limit switch in Arduino ISR with delays

I have a limit switch attached to an arduino Mega 2650 for motion control. The limit switch's two Normally Open contacts are connected to an Arduino Pin and ground, such that when the Limit Switch is ...
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1 vote
1 answer
172 views

Help with button library, hold>2s doA else doB

I'm using JChristensen's Button Library to debounce my buttons and provide extra functionality. I'm trying to use his press & hold function to do something if the button is pressed and held for ...
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1 vote
1 answer
88 views

Can anyone identify why this incrementer is losing count?

I am working on a project where the end result is to count the number of cycles of a moving piece of metal using an inductive sensor. For now I am using an Arduino Uno and have created a breadboard ...
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7 votes
7 answers
16k views

Good button debouncing/stateChange library

I need debouncing/stateChange for a push button configuration. Is there a good library for debouncing/stateChange buttons in Arduino (without delay)?
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2 answers
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Newbie needing help with debounce errors in arduino

So I found a code I would like to use and not sure how to edit the code properly. #include <Debounce.h> void matrix(char matrix[7]) { int map[10]; map[0] = 2; map[1] = 3; map[2] = 4; ...
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3 answers
1k views

Unintended reaction: Sketch makes LEDs turn on and of randomly/LEDs don't react

Update: This piece of code does not do the same as the one in the right answer, it also reacts when one lets go of the button. int button_prev = 0; int button = 0; void loop(){ button_prev = ...
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