Questions tagged [timers]

Timers are the hardware in the processor used to count and time events. Use this tag for questions about the hardware timers.

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Converting human readable date to a unix timestamp [duplicate]

Can anyone provide a sample code that would convert a human readable date like 2019-10-27 22:10:35 to a unix timestamp like 1572214235? I found many topics about it, but they eider refer to out of ...
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1answer
101 views

Trying to create a delay function whilst performing other functions, using Timer.h libraries. Arduino uno

I am having a compilation error saying invalid useof template-name 'Timer without an argument list.
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334 views

Running loop for a specific time period

I currently have a loop that runs without a time condition: unsigned long previousMillis = 0; // will store last time LED was updated int WET=4;//wet line int DRY=5;//dry line int Inhale=1000;...
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59 views

Alternative for Particle Photon's Timer

I am converting a program made for particle photon to a Mega, everything is working except for the interrupt timer. The code that is of concern is (it's a .cpp file being included in the main .ino) ...
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1answer
60 views

Variable updated in ISR is miscounting

I'm using a timer to fire a interrupt in configurable time periods. In that ISR, a pin is toggled, and a uint32_t variable is incremented. In the main program, a while loop waits until that variable ...
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1answer
52 views

Can an arduino Uno control led, sound and smoke?

I'm pretty new to this and I've not seen anyone answer this question yet - so I figured I would ask. I have a vape mod that is set up to expel smoke with a trigger. I want to merge this trigger to ...
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0answers
738 views

Arduino Every 25k PWM signal

I have written a class for generating a 25khz pwm signal for the Arduino Nano. This works great (pin 9 and 10 only) on the Nano. I want to switch to Arduino Every; this code does no longer work (the ...
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1answer
452 views

5 minute timer output time remaining

I am trying to create a timer that outputs the time remaining in minutes. I am using an Adafruit Circuit Playground Express. For example, if the timer is 5 minutes, then every minute it should output ...
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0answers
130 views

Send ECG data using buffer in real time to the server without using delay

I am trying to make a ECG monitoring system using Arduino, GSM and ECG sensor which data should be sent to the private server in real time. Those data are then collected via Matlab on the remote ...
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1answer
312 views

Set PWM by period? And have it variable?

In this other stack QA I'm asking about generating a pulse signal with a period ranging from 63 ms to 6.5 ms. There is a popular PWM library however it doesn't compile and also since 63 ...
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2answers
324 views

control 3 relays with 1 button

Is there a way to control 3 relays with 1 button? My idea is: There are 3 modes; mode 1 for relay 1, mode 2 for relay 2 and mode 3 for relay 3. With a long press you switch between modes (After 3 ...
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1answer
331 views

Arduino Mega TIMER1 one second interval

Is this timer set correctly for Arduino Mega? It should count exactly one second. And why when I print in serial monitor (seconds_passed++) is it incremented by 2 not by 1? Full code on Pastebin: ...
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1answer
34 views

Check if a set of events occur in a limited time period

I am making a project in which I am using 4 Infrared sensors to take an input. The way I want it to work is such that when one of the sensors is triggered, the code listens for input from the other ...
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1answer
2k views

how to set buzzer on and off

I have a project that require me to use magnetic contact sensor. I will put the sensor at the door. So the idea is i want every time someone open the door, the buzzer will make a sound, but it will ...
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0answers
81 views

Turning on controller with button and turning off with a timeout

I am making a device controlled by an ESP 8266 and am wanting to save power by having it power down when not in use. The desired behavior is for a momentary button press or vibration sensor activation ...
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2answers
206 views

maximum interrupt-based PWM frequency at 500 Hz

I need to control a 24 kHz ultrasonic transducer and decided to use an arduino uno I have lying around. Using tone() or the atmega's hardware pwm is not very suitable because I need two 50/50 square ...
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1answer
2k views

Timer Countdown to control relay (multiple functions in void loop)

I'm trying to build this project with a simple code. Object is to hit up button to increment minutes or down to decrement minutes then hit start to start countdown, while its counting relay will turn ...
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1answer
217 views

How to code 4 relays to go off in intervals and not in sequence? [closed]

Code : //FOR AEROPONIC SYSTEM WITH ROOM TEMPERATURE AND HUMIDITY SENSOR //AND 4 GROW CHAMBERS WITH DIFFERENT SPRAYING TIME // RELAY CONTROL #define RELAY1_PIN 2 #define RELAY2_PIN 3 #define ...
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1answer
83 views

RDTSC alternative for Arduino

To calculate an operation execution time, I was saving the millis() result before and after the operation to calculate the interval time. Is there an alternative on the Arduino Uno like the RDTSC ...
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1answer
102 views

Arduino Timer0 Piggyback

As described here https://learn.adafruit.com/multi-tasking-the-arduino-part-2/timers I use timer 0 to get my own timer with a milliseconds resolution. It is setup like this: void setup (void) { ...
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1answer
729 views

Arduino Timer with increase time button

I have an Arduino project to do, which requires a countdown timer(which I've already done). I connected a push button, and when I press that button I need it to increase my countdown timer by +10 ...
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0answers
270 views

Why does my TFT keep turning white after moments?

Alright, seems there is something wrong I am doing that I don't understand. Before I start explaining, my question is different than this white screen question. First of all my TFT ST7735 is working ...
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2answers
201 views

Start / end events using milis

I want to start a relay, have it run for 3 seconds, stop for 10 seconds, repeat. I can't use delay, because I have a motor driver starting / stopping every 100 milis. So I put together this code, ...
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2answers
654 views

esp8266 deep sleep timer slightly inaccurate?

I'm making a door open timer using a hall sensor and have a wemos d1 mini that uses a deep sleep to sleep for 1 minute after checking the hall sensor state and printing the value on the serial port. I'...
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2answers
203 views

How to drive Arduino UNO as a counter triggered by 555 timer's output (astable mode)

I have an Arduino Uno and a 555 timer configured to astable mode. What I'm trying to do is to program my Arduino to increase a "counter" variable (counter++) everytime it gets triggered by 555 timer'...
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2answers
361 views

How to increase the serial port's data throughput

I have an array of numbers that will be subtracted from the ADC readings of a 50 Hz sine wave. Using Serial.begin(57600);, I can only output 25 samples per sine wave cycle, or about 1,250 samples ...
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1answer
243 views

Arduino Mega - Enabling CTC mode disables timer

I'm trying to use timer3 on an Arduino Mega 2560 in CTC mode. However, enabling CTC disables the code entirely. Here is the function I call in setup() to setup the times. void SetupInterrerupt() { ...
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1answer
54 views

How do I start a task and have it run for a set amount of time?

I have a project where I need to turn a 24V solenoid on for a set amount of time, then have it turn off. I am rather new to Arduino and not certain how to do this or really where to start. Ideally the ...
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1answer
926 views

Measure cycle count and time of Digital Input

I am currently working on a project which is read a digital input signal from a machine. The machine operation is as below: when the mold close, the machine gives the "HIGH" signal, when mold is open ...
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1answer
335 views

Why is no PWM signal generated using Timer 2?

I managed to work with timer 0 and 1 but am unable to generate a PWM with timer 2 in my atmega328p. This is the code: #include <avr/io.h> int main(void) { /* PD6 output */ DDRD |= (1 &...
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1answer
308 views

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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1answer
2k views

Enable and disable individual interrupts

I am working on timer interrupts and external interrupts. for external interrupts I understood the functions like attachInterrupt. detachinterrupt for individual interrupts ,noInterrupts() and ...
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1answer
159 views

Force TCNT to stay below OCRxA on ATmega328P

I'm using a timer and the TIMERx_COMPA ISR to generate a signal in "the background". This ISR is triggered when the timer reaches a certain value (OCRxA), which in turn can be changed by the user. ...
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1answer
235 views

What does "Update of OCR1x at" mean in the WGM table of ATMEGA328?

I just finished a reading a couple of online guides on how to use timer registers with pulse width modulation, so I'm still new to its concept. When I looked in the ATMEGA328 specification sheet, I ...
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0answers
352 views

Millis() is Not Working

I have a sketch that uses two timers using millis() from a library I created to keep time. The timers seem to be working correctly, but when I print the start time of each timer, it is clearly wrong. ...
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1answer
655 views

timer library on Arduino DUE

I'm trying to call an interrupt routine (let's call it handler() ) every second on my arduino DUE. I thought the simplest way to do this was to use this library but it seems that i don't know how to ...
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1answer
2k views

Handling overflow in micros() [duplicate]

The documentation for micros() says: Returns the number of microseconds since the Arduino board began running the current program. This number will overflow (go back to zero), after approximately ...
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0answers
860 views

timer interrupts on an esp8266

Folks. I'm working on an ESP8266 and keen to switch to using: an object approach -> sorted; physical interrupts on the hardware pins -> sorted; timer interrupts -> driving me crazy! My problems are ...
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2answers
51 views

Can I use a pot to vary duration of timer circuit without writing code for each time interval? [closed]

I would like to be able to use an Arduino as a timer control to switch on/off a 120VAC load. I think I can do that with the Arduino triggering a small relay controlling the 120V contacts. But I need ...
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2answers
1k views

Button for Delay Select

My target is to make an Arduino system that is able to change modes with different delays by pushing a button. For example, if I pressed the button, it will go into mode 1 with loop 1 that has a 30s ...
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0answers
210 views

How to generate 4 square signals using Arduino Mega 2560 below 30hz using timers

I would like to generate 4 square signals of different frequencies below 30 hz using timers of Arduino Mega. I was able to generate 30.6hz signals but I have no idea how to generate lower frequencies....
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2answers
73 views

Please Correct my Delay Code without using delay();

This is my loop()function: if(Serial.read() == 't') { tarestate = true; } while(tarestate == true) { timeNowTare = mills(); if(mills() - timeNowTare >= 3000) { Serial.println("Tare"); ...
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1answer
534 views

Does enabling the Timer1 CompareA interrupt instantly triggers an interrupt?

I am learning Arduino interruptions and I am unable to explain the behavior of a minimalistic interrupt driven project. The project is the following: an Arduino UNO is connected to two LEDs, on ports ...
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1answer
2k views

How to find the difference between two timestamps

I'm using this time library to access the properties of unix timestamps like hours / minutes / etc. What I want to do is get the current time, and an estimated arrival time, and find the difference ...
2
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1answer
752 views

Triggering a soft reset (Arduino Leonardo)

I want to trigger a soft reset on my Arduino Leonardo, and after some searching settled on using the watchdog timer, as it seemed to be the easiest and cleanest way to do it. However, I don't think ...
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1answer
786 views

Trying to run Timer1 in ATmega2560 with assembly

I have a slight problem with Timer1 in arduino (ATmega2560) while coding it in assembly. I try to run the Timer1 in CTC mode - I configure everything well in my opinion, but the TCNT1 just doesn't ...
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1answer
55 views

How to set time for 15 seconds

When user used one password after close the servo the password will valid for 15 seconds then it will not work. Other 9 will be same process Here is code I need just this to set int locker = 13; ...
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1answer
178 views

Can I use arduino to generate 8mhz frequency ultrasonic pulses in piezo discs?

void setup() { pinMode(freqOutputPin, OUTPUT); Serial.begin(9600); // Set Timer 2 CTC mode with no prescaling. OC2A toggles on compare match // // WGM22:0 = 010: CTC Mode, toggle ...
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1answer
521 views

Using timer classes within classes

I am trying to develop a class for a pump that works on a stepper motor, it should be simple but its not working the way I thought it would. Once I move the timer object into the class the code wont ...
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1answer
125 views

What is the smallest duration that can be measured using micros()? [closed]

What is the least value of time that I could measure(count) using micros()?

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