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Questions tagged [timers]

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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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I have three RF24, all of them are connected to one arduino-uno each. The first one has sensors that sends data to the second one then the second one passes it to the third one. The first pass from ...
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I want to use my arduino to turn a light off for 16 hours and on for 8 hours. I know the general code, just using delays and the relay shield code as well. I want to know how accurate this will be? ( ...
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I want to sample an ADC at very regular intervals. Right now, using millis/micros (which are driven by the internal RC oscillator), I'm off by around 3000 ppm, and it drifts. Here are some things that ...
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I have had to use Timer0 with phase correct PWM and a prescaler of 1. This results in a 32khz PWM frequency and obviously impacts millis, delay and micros. (Timer1 and Timer 2 are also in use so ...
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Is there a way to set a time for instance 8.00 PM to make the arduino-uno start or stop at that time?
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I'm writing a code where analogRead() reads ADC value from load. After reading ADC value, if it is not in range, I need to manipulate Timer1 value. Which is also getting changed. But, after changing ...
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I'm working on a project of differential drive control in which I use speed encoders for the odometry. I count the number of rising edges using counter0 and counter5 (on Arduino Mega 2560), which ...
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This example is a simplified version of what I really need to do, but I think it demonstrates the problem (= my misunderstanding?). I need to use a timer to count microseconds; my code shows how I ...
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we are asked to create an Arduino code that would run a 4 Bit Binary UP counter once a push button switch is pressed and then 4 Bit Binary Down counter on the second click. Then vice versa. This ...
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The op of pin 11 should be inverse of pin 3. I used digitalreadfast and digitalwritefast and used simple if else. But the delay is high as 10us. What should i do? I found this code in forum but its ...
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I'm a beginner into Arduino so I have a little problem where I'm trying to do a countdown on LCD using while loop but I'm also trying to get a key input inside that same while loop. Problem is that ...
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I am using an arduino Micro to generate 8 square waves on 8 pins. The idea is as follows: on pin 13 is the main square wave. It represents a certain BPM (beats per minute). The other 7 pins should ...
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I'm having difficultly using an internal timer interrupt with my Arduino Nano to properly capture a specific value from a linear potentiometer and then instantly stopping the actuator. I basically ...
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Do you have to upload the UNO after the applied power is disconnected? Does the UNO retain the code without any power? And when the power is disconnected, if the code is retained, will the timers ...
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I'm trying to use a library function in my ISR function that uses the internal timer to trigger every 1 ms. The chip that I'm using is an ESP32-C3-MINI. Here is my current code: main.cpp #include <...
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I have a Teros 11 moisture sensor that I have managed to make it work with the SDI-12 arduino library. However, this library does not work with SoftwareSerial and this is critical for me. There is a ...
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I'm using the hardware timers on the 328 for phase angle control of a triac with zero-crossing detection. I am encountering some strange behavior with the "Set on Compare Match" feature not ...
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I've run into an issue trying to combine 2 different Arduino timer projects I've found online. For both projects I'm using a DS3231 RTC, but have been able use the DS1307 library just fine in my ...
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I want to read the data from an IMU (MPU9250) periodically. To do that I use a ticker as shown in the following code: #include <Ticker.h> #include "MPU9250.h" constexpr int ...
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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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I have three analog sensors like voltage, temperature and pressure. I need to measure the voltage and temperature every 10 ms and I need to measure the pressure alone every 30 ms by using the timers ...
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I'm learning how to code a "BOE Shield bot" with a partner at my university (first year). To clarify for those that do not know: a BOE Shield bot is a small robot equipped with 2 servo ...
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I'm trying to get warning with buzzer while I get same values on 3 seconds. But first warning doesn't wait 3 seconds. Second warning is correct. Code is attached. BlinkLED1() method is same BlinkLED2. ...
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I have a 32.768 kHz signal at the ATmega328P input. I need to get 2 signals from this signal: 1Hz and 32Hz. How well will it work? How to do this with a ATmega328P Timer/Counter? What gain will the ...
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3 answers
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I programmed an Arduino Uno R3 to trigger a relay once every 24 hours from the moment it is powered on. I calculated milliseconds and used the function delay(). 24 hours * 60 minutes each hour * 60 ...
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