Questions tagged [code-optimization]
The process of improving the efficiency of a program such that is uses less memory and/or less computational time.
106
questions
0
votes
0answers
48 views
Reduce time between two consecutive SPI transfers on ESP32
I'm trying to drive an external DAC via SPI interface using ESP32 chip. But I cannot achieve the desired speed (>1M transfers/sec, each transfer consists of 16bits). The reason is not the SPI speed ...
0
votes
2answers
83 views
Is there a variable type of half byte? Is there a workaround?
I have this long array of 64 values going from 0 to 15, values which only cost 8 bits, for a pulse width modulation.
So I made a test to see its cost in space, commenting one of the two arrays.
const ...
5
votes
4answers
2k views
What are the traditional ways to optimize program memory usage?
While doing big projects using Arduino boards (Uno, Atmega328P MCU). I used to get warnings like this
Sketch uses 13764 bytes (44%) of program storage space. Maximum is 30720 bytes.
Global variables ...
0
votes
0answers
29 views
combinate two codes [duplicate]
i am trying to put these two codes together someone would be so kind to help me.
""#include
const int photores = A0; // Photo resistor input
const int pot = A1; // Potentiometer input
const int led =...
0
votes
0answers
27 views
Division with big constant number. Ideas to make it more efficient?
Im reading the voltage applied to my microcontroller using the internal voltage reference.
Here the topic is talked, and there are some working examples.
Im NOT using this examples, im using my own ...
1
vote
1answer
48 views
Thermocouple and multimeter
I've put together this script that should allow my Arduino Mega to be show thermocouple readings on the serial monitor, whilst also showing readings of voltage and ohms across a given component. I'd ...
-3
votes
1answer
56 views
What is PWM actually? [closed]
tcommand=(pwm_value-480.0)/8.22;
flapmag=(pwm_value-880)/41.0+10;
In this piece of code used in arduino, I don't understand why PWM value is subtracted and divided like this. This is not my code. Any ...
0
votes
1answer
84 views
Plant irrigation system
I'm very new to the Arduino game I wanted to make a small auto watering system for my plants. I bought these items
5V 1 CHANNEL RELAY MODULE FOR ARDUINO PIC AVR DSP ARMB
9 VOLT BATTERY SNAP ...
0
votes
0answers
47 views
Dragino Lora shield for Arduino sensor use
I am new to arduino and lora technology and i have dragino lorashield for arduino Uno and dragino gateway. I have also MQ-3 gas sensor and I want to detect the alcohol value and to send it to the ...
0
votes
1answer
45 views
FIXING BUG when Using Wire library to obtain compass heading
I am using the HMC-5983 magnetometer module to obtain the compass heading of a autonomous car I am building using the arduino platform.I'musing the
Z axis and X axis to obtain the heading.
However ...
-1
votes
2answers
34 views
multiple invdividual servo controll arduino
I want to declare 11 servo motors in my code. Is there a better way to do that than just declare everyone under each other. The reason is that i have a code that will set the rotation for one at a ...
0
votes
1answer
63 views
Modular Coding - What types of code portions to convert into library files? Rationale and methods?
I'm working on documentation and combining 2 pieces of code for testing parts of a larger project.
I'm supposed to comment and make the code very clear to people who will use it later and make sure ...
-1
votes
1answer
77 views
Refactoring bad design?
Could someone help me how to refactor old very complex code ?
Original used just setup and everything else was in single ISR.
But as it was bigger and bigger, code is quite slow and quite random ...
0
votes
1answer
288 views
Using Serial.write() to send a uint32_t send one byte x4 or send 4 bytes x1
In the IRremote library, IR signals are decoded and held in results.value. My project uses the NEC protocol which is 32 bits, so the IR code will always be 4 bytes.
uint32_t dCodedIR;
//
// code ...
-1
votes
1answer
259 views
Optimizing for speed using const, static, constexpr etc in a function
In an ISR I want to keep things quick. At the same time I want to limit variable scope. Storage space is not a factor.
I have this line:
const char trigs[] = "aAbBcCdDeEfFgGhHiIjJ";
When this is ...
1
vote
0answers
271 views
Optimizing Teensy 3.6 for data sampling?
So, I have a very basic project where I cycle through 8 IR individual transmitters. After setting the individual transmitter high, I cycle through all 8 IR receivers and print their values, RX_CYCLES ...
0
votes
2answers
152 views
28 BYJ stepper motor runs faster using delay() and little slower using millis(), why?
I'm working to develop a code for the stepper motor to use it in a project. And since using delay() isn't as efficient as millis(). So I first developed the code that use delay with 1ms delay between ...
0
votes
0answers
49 views
Combining sketches
I have two codes for my to sensors and they work separately. However, I need to combine them in one program please can you help?
The pulse code
/* PulseSensor Starter Project and Signal Tester
* ...
1
vote
0answers
191 views
FIltering, FXOS8700, FXAS21002C optimization
I'm working on an inverse pendulum project, and am using an adafruit NXP_FXOS8700_FXAS21002 along with an Arduino due, and an esp8266 (two separate projects, same code however). I'm using a Magdwick ...
0
votes
3answers
107 views
Is there a more elegant way to check highest / lowest sample data?
N00b question,
Is there a better way for readability / elegance / DRY etc to check various sensor values for high/low record value? This code works, but looks like the long way round.
void ...
1
vote
0answers
139 views
Why does the program size increase so drastically with these switch-cases?
EDIT: The problem is my op-code catch is op >= 0x20 || op <= 0x2F rather than op >= 0x20 && op <= 0x2F and so most of the switch-case was being optimised away!
This is a really ...
-1
votes
1answer
285 views
how to code LED turning signals on smart car [closed]
this question is regarding how to add turn led signals on arduino powered smart car. I have 4 leds to give turn indications on my smart car(line follower, obstacle avoider, Bluetooth mobile controlled ...
1
vote
2answers
1k views
Best practice to declare a 'static' text and save memory
I'm working on a project where I need to create a JSON to send back state of an object. I created the code to achieve it and all works fine, but I used this to declare the JSON fields:
static const ...
0
votes
2answers
57 views
Merging of two functions
This is my Arduino code that checks the water Level of two different water reservoirs via 2 water Level Sensors A and B:
#define Water_Level_A 5;
#define Water_Level_B 6;
boolean Water_Level_Check_A(...
-1
votes
1answer
158 views
Need help optimizing snake game code for Arduino Nano
Here's the code:
https://pastebin.com/ypWe4NZw
This is the output when I compile:
Sketch uses 13086 bytes (42%) of program storage space. Maximum is 30720 bytes.
Global variables use 1456 bytes (71%...
2
votes
0answers
2k views
Sending data from webserver to Arduino
Hello Arduino enthusiasts! I've been working on a keypad lock system for school lately and I need some advice.Basically, my code checks if the entered passcode is the same than a predefined passcode ...
0
votes
3answers
610 views
Switch case does not work after booting system
int value1;
int value2;
int runs1 = 0;
int runs2 = 0;
#include <Wire.h>
#include <LiquidCrystal_I2C.h>
LiquidCrystal_I2C lcd(0x3F, 16, 2);
int inPin = 6;
int val = 0;
int push_count = 0;
...
2
votes
3answers
139 views
Conditional randomization gets stuck
First-time poster here...
I have the following code to randomize note values and store them in an array loop1[i], where i is a specific step in the loop:
nextNote = random(-2, 3);
note = note + ...
1
vote
1answer
101 views
LED Programme where it delays the amount written in the Serial Monitor
I have written a simple code to delay the blinking of LED 13, the delay time is set by us.I have incurred a problem when I enter a 2 digit value in the serial monitor.There is some problem with the ...
7
votes
2answers
550 views
Storage usage of methods compared to copied code
When you have really small snippets of code that are repeated several times in your micro controller program, is it better to write a method? I mean better in terms of performance and storage usage. I ...
2
votes
3answers
770 views
Reducing Memory Usage lots of Floats
Im using an Arduino Uno - All code at github.com/robbrad/AirQuality
Current sketch usage:
Sketch uses 23186 bytes (71%) of program storage space. Maximum is 32256 bytes.
Global variables use 1428 ...
-2
votes
2answers
3k views
Counting number of people inside a room [closed]
I want to count the number of people in a room using a microcontroller (Arduino Uno).
I have 2 ultrasonic sensors at a doorway about a 1.5m apart from each other. I want to increment the number when ...
1
vote
2answers
1k views
Const data optimisation for Arduino
I'm taking a course on Arduino Uno programming and on today's talk I heard that the const data is optimized by Arduino, so that it occupies less space than the actual data type (namely, a const int ...
1
vote
4answers
141 views
Porting code from Arduino IDE to other IDEs - expected code size reduction
Could I realistically be expecting some 25% - 50% code size reduction if I abandoned Arduino IDE's framework and moved to something more rudimentary such as AVR Studio ? I am using the EEPROM, Timer1 ...
0
votes
3answers
376 views
Breaking up for loop with ISR
I am curious if the following scenario is possible.
EICRB |= (0<<ISC60)|(0<<ISC61);
EIMSK |= (1<<INT6);
ISR(INT6_vect) {
myISR();
}
void myISR() {
digitalWrite(led_off, ...
0
votes
2answers
3k views
Controlling the Serial Monitor for 10 seconds
I am an amateur with Arduino and coding and I am learning in my lab class. My project consists of using a photoresistor to measure the brightness of a white LED. I have the following circuit built.
...
1
vote
1answer
1k views
Super-fast USB communication; how is it possible?
On Arduino forums, there's a post where someone improved the USB communication and made it super-fast. I don't understand how he did this, and I'm trying to recreate this, but failing.
My test code
I ...
1
vote
1answer
3k views
Optimizing Arduino File Selection from SD card
the following code will display the files on an SD card in an Arduino and allow the user to open a file of their choosing. Here's the code with a walkthrough of what it does.
In the Init state, I ...
0
votes
2answers
408 views
Correct use of interrupt vs monitoring switch
Background:
I have a uni assignment which requires an autonomous robot to do a number of tasks and then finish in a set spot after being triggered to start by an outside physical interaction. I've ...
12
votes
5answers
4k views
Does an Arduino get worn out by too much command execution?
Excuse me if it is a silly question, but I couldn't find an answer.
I've been wondering for a while whether an Arduino (or generally any other micro-controller) gets happy if the code is light and ...
2
votes
1answer
604 views
Error in IR receiver project
I'm trying to receive remote information with an IR receiver and this is my code:
#include <IRremote.h>
int RECV_PIN = 11;
IRrecv irrecv(RECV_PIN);
decode_results results;
void setup() {
...
-3
votes
1answer
58 views
Create an a message from two inputs[Programming Help] [closed]
I'm a bit new to this and I have the following function that I'm having trouble getting it to compile. The intent is to create a message to write out to a software serial port. Inputs are two int ...
1
vote
1answer
62 views
Array Addressing
Is it possible to use a name instead of a number to address an array? I was reading about enum lists and thought it might be possible.
ie
int array[3] = {something, somethingElse, somethingMore]
...
0
votes
1answer
449 views
Switch Statement Alternative
I am working on a project where I've mapped an IR remote control to certain functions. I am currently using a massive switch statement to control the program based on the IR remote button pressed.
Is ...
2
votes
1answer
212 views
Is setting clock divider worth changing on delay() to save power?
Along all the "advanced" methods described in this article, does simple method as downscaling processor while delay makes a difference on power consumption? How much time does the clock alternation ...
0
votes
2answers
512 views
code optimazation 6x6 Matrix
I planed a 6x6 matrix with a Arduino Nano as controller.
Its only possible to let one LED in the matrix lighten up.
Any idea how I get the Code smaller? (Im a C Noobie ^^)
~Nico
Circuit diagram:
...
1
vote
2answers
1k views
Low Power Library 4 seconds ON, 10 minutes OFF
Could someone please demonstrate how to use a counter with the Arduino 'low power' library to wait for 10 minutes then digitalWrite 4000, HIGH and loop. (I don't mean the simple 'blink' sketch).
I'm ...
0
votes
3answers
3k views
Arduino Blink two LEDs without Delay(amount of repetitions)
Arduino community. I have had experience with Arduino for 3 years now and have finally come to the conclusion to get rid of the delay function entirely.
Below is the code to blink two LEDs a ...
0
votes
2answers
528 views
Is this example for playing music without delay correct?
I've followed the directions from this answer, to try and play music without delay. This is my code so far:
#include "pitches.h"
int melody[] = {
NOTE_C4, NOTE_G3, NOTE_G3, NOTE_A3, NOTE_G3, 0, ...
1
vote
1answer
587 views
Optimization Teensy 3.6 Arduino IDE fast I/O Multiplexing Led Matirx
I'm currently working on a 10x10 LED Matrix which is controlled by 5 Shift registers using multiplexing. I've the problem that the Teensy 3.6 is too fast/slow.
One part of my code is the Shiftout ...
