Questions tagged [calculation]

A mathematical determination of the size or number of something.

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Unexpected Behaviour w/ Arduino Uno Calculation

I have a really simple snippet of code wherein the same calculation outputs different values depending on how I do the calculation. The platform that I am running this code on is an Arduino Uno - with ...
Archit K's user avatar
2 votes
1 answer
320 views

how accurate is the calculation in stm32?

I have a project plan in which there are calculations that require high precision, which later will have calculations with numbers after commas such as 245.5431657288. from some of the information ...
sagise's user avatar
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4 answers
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Issue with incrementing PWM over time

First post here. So I have an issue, which I have identified, but I'm not quite sure how to fix it. I'd really appreciate some input and suggestions. I realize that my "pwmDelta" is the problem, but I ...
gfritz25's user avatar
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1 answer
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How to execute commands over desired amount of time

I have a program that receives 4 commands on 4 channels to change the color of an LED using mqtt communication. Lets just focus on two of the channels, the time and the red. I am sending a length of ...
Jordan Klaers's user avatar
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1 answer
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Rounding float number

I want to enable user to change the duration of PWM from 0 to 255, the number should be in minute and increase/decrease with two push buttons. (X) x 255 / 60000 = minute In above example each time ...
ElectronSurf's user avatar
-2 votes
1 answer
770 views

What should the cut-off frequency be? [closed]

To convert a PWM signal to a DC voltage it must be filtered with a low pass filter. How can you know which cut-off frequency should be used and how do you calculate the values for the resistor and ...
Sophie's user avatar
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1 answer
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How to map integer values and round to a count of tens/thousands?

I'm mapping a potentiometer from 0-1023 to 1000-120000 (1 sec to 2 minutes) for a timer, like: maxDelay = map (pot2, 0, 1023, 1000, 120000); Both variables are integers. Now I would like to convert/...
Emerson's user avatar
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1 vote
3 answers
743 views

How to filter or eliminate earths magnetic field readings around 3D Magnetic sensor?

Im using the SparkFun MAG3110 3D sensor: https://www.sparkfun.com/products/12670 My application is essentially to make a contactless "magnetic joystick" using a local magnet for accurate and constant ...
dandev's user avatar
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2 answers
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Using modulo for negative values

I want to wrap a random number using modulo, so that values exceeding 11 starts over from 0 and greater. However, i would also like numbers less than 0 to dividend 11 or less. Please correct me if i'...
Erik's user avatar
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2 answers
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C++ Adding Two 16 bit binary numbers together

I am trying to add two 16 digit binary numbers together. Each binary number will have been entered by the user and saved as: int binaryOne[16] and int binaryTwo[16]. Originally, int binaryOne[16] = {...
Katie's user avatar
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1 answer
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How to calculate actual Baud Rate and its percent error?

I am using an Arduino Uno, and I need to create a program that calculates the actual baud rate and the percent error for all standard baud rate in Arduino monitor program.
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When i press a button to subtract 1 from 5 it skips to 3

When i press a button to subtract 1 from 5 it skips to 3, it's the same when I add 1 to -5 it skips displaying - 4 and goes straight to -3. This is the code that i am using: //Testing the use of ...
Liam's user avatar
  • 167
-1 votes
3 answers
398 views

How do I create boundaries for the possible values of an integer? [closed]

I want to create an integer whose total value cannot go beyond a range of numbers when added to and subtracted from. For example, if the "total_value" started at 0 (of a total possible range between -...
Liam's user avatar
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0 votes
2 answers
6k views

How to calculate step delay? [closed]

I'm struggling with get suitable step delay while driving a stepper motor. How to calculate exact step delay for 1.8deg/step stepper motor? Give some example calculation.
user_fs10's user avatar
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4 answers
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Reading pressure sensor using Arduino analog

I'm using a Arduino Uno to read pressure and I want to know if I have wired/coded the sensor correctly. I'm not sure I'm getting the correct readings (it could be the right readings - I just want to ...
resolver101's user avatar
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1 answer
559 views

Unsigned long overflow? Or something else?

I have been looking at this for hours and can't figure it out... Take the following code I ran on an Arduino Mega: #define MINUTES 0 #define SECONDS 1 #define MILLIS 2 #define ...
Andre Courchesne's user avatar