Questions tagged [timing]
This tag is for questions about timing code execution, or external events.
73 questions
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How does `delay()` differ from using `millis()` in terms of processor efficiency and responsiveness?
In many Arduino sketches, especially beginner ones, delay() is commonly used to pause between actions. However, I’ve seen more advanced projects use millis() instead to handle timing.
From a ...
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Difference Between delay() and a while Loop with millis() in Arduino?
What are the practical differences between using delay() versus a while loop with millis() for timing in Arduino projects? I assumed both methods are blocking, but I'm not completely sure.
Example ...
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Arduino Uno Serial.write() how many bits are actually transmitted at once by UART and effect of baudrate on other interrupts
With Arduino Uno Rev3, I am trying to maintain a delicate timing while handling data transmission. I want to send 6 bytes at a time, which takes around ~44 us when I time Serial.write(). The time it ...
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Software debouncing a button when released
I'm having some trouble with software debouncing on Arduino UNO. There is a condition in my code where an unwanted debounce registers as a button push.
I'm using an interrupt for my button press, ...
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I need a 10KHZ PWM signal from pin 3 and 11 using timer 2
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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Serial Buffer stays empty as soon as it becomes empty once
I have a question regarding serial buffer readout.
At program start, I send a serial command to a sensor that 1. activates him and 2. let him send data - that works.
When I unplug the sensor, the ...
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best practice for performance: empty loop() when using interrupt?
I'm working on a little midi hardware project and I'm using attachInterrupt() to assign a callback function to an interrupt pin.
Nothing gets done in the loop function, so it looks like this:
void ...
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I goofed: I used a digital output rather than an analog output
OK, I have a little hardware issue I need to fix in software for the time being. I say, "For the time being," because I already have the PC Boards printed, and I need to make do for this ...
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delayMIcroseconds and micros execution time not explainable
i just experimented with the timing accuracy of my Arduino Uno R3 using this code:
unsigned long beginTime;
unsigned long endTime;
void setup() {
Serial.begin(9600); // open a serial port
}
void ...
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Arduino Timer Drift Issue
I have two Arduinos that communicate over serial. Each arduino runs a TDMA algorithm where each arduino is assigned one timeslot. The arduinos should transmit during their timeslot, which does work ...
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How can I SPI "Latch" (LE/CS/SS) for a specific number of SCLK cycles?
Context
I am working on a project which includes 13 cascaded STMicroelectronics LED1642GWs. These LED drivers are essentially 16bit shift registers, whereby the buffered serial data can be loaded to a ...
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How do I run 4 LEDs sequentially based off of a push button input?
I am trying to create a program that runs 4 LEDs sequentially while also being able to do other things with different inputs and outputs. Because of this, I am using the millis function and not the ...
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Synchronizing an internal frequency to an external one
In this question:
Procedure for changing frequency of Nano or similar, @EdgarBonet gave a very nice method of generating timings that don't divide the system clock evenly. He also said that it would ...
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How fast does the Arduino execute code?
I am using the Arduino Nano every. Take this example where I am measuring two things A and B.
Loop{// this loop runs once every second
//Read A,B
//Change something using analogueWrite which ...
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How can I read the Timer direction in phase correct PWM?
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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