# Questions tagged [calculation]

A mathematical determination of the size or number of something.

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1 answer
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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 ...
• 23
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 ...
• 31
2 votes
4 answers
622 views

### 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 ...
• 21
0 votes
1 answer
50 views

### 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 ...
0 votes
1 answer
2k views

### 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 ...
• 794
-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 ...
0 votes
1 answer
148 views

### 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/...
• 105
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 ...
• 53
0 votes
2 answers
979 views

### 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'...
• 261
1 vote
2 answers
2k views

### 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] = {...
• 43
2 votes
1 answer
1k views

### 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.
• 21
1 vote
2 answers
200 views

### 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 ...
• 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 -...
• 167
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.
• 187
2 votes
4 answers
13k views

### 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 ...
• 155
0 votes
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 ...