Questions tagged [code-optimization]
The process of improving the efficiency of a program such that is uses less memory and/or less computational time.
126
questions
7
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4
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957
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Optimizing code for ATtiny10
I'm trying to squeeze code onto an ATtiny10, but I'm just not getting there. I'm using 1060 bytes and only have space for 1024 bytes.
The code is simple enough; I need to read a button pin. If high it ...
2
votes
2
answers
140
views
How to swap byte order
Background
I'm reading a 24-bit ADC value into a uint32. Using SPI bus, here's the logic:
value = SPI.transfer(0); // read first 8 bits (MSB first)
value <<= 8; // shift bits ...
- 121
-2
votes
1
answer
60
views
How do I create a code that lets me use an array of 10 thermistors on one arduino?
I am new to programming and am trying to create an array of 10 thermistors on one arduino. So far I have found a code for Temperature Sensor Using NTC Thermistor that is only for one thermistor. How ...
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0
votes
1
answer
53
views
Optimised random alphanumeric string generator
I'm trying to build arduino nonce generator, but the only thing I found is this question on arduino forum but I can't find out how to make it work for me. I checked and Serial.available() is always 0 ...
- 305
1
vote
0
answers
31
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How do I optimize this IRremote code?
I am using a ATTINY85 Digispark board with an IR receiver to light some LEDs in my project. The Digispark has a limitation that does not allow it to use the IRremote.h library. I know that there a ...
- 123
0
votes
1
answer
59
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Parallel I/O - maybe use Machine code function call
I'm a newbie to arduino but been programming lots.
I have a project where I would like to output 4 bits to adjacent pins and read 4 bits from another (4) adjacent pins. (Imagine a matrix keyboard ...
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1
vote
0
answers
54
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Can a Windows 10 computer use Arduino IDE 1.8.10 sometimes AND use Arduino IDE 2.0.0 the rest of the time?
Can Windows 10 computer use Arduino IDE 1.8.10 sometimes, AND use Arduino IDE 2.0.0 the rest of the time?
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1
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0
answers
372
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converting int or float into bytes array in arduino
I am trying to send data from one arduino to another over ethernet using udp protocol.
In arduino writing data over udp is like this
UDP.write(buffer, size);
where buffer is an array to send as a ...
1
vote
1
answer
131
views
send and recieve analog data from one arduino to another arduino via web/ethernet
i am able to send audio signal through mic and send it via arduino and receive it on speaker.
i need two things
1.) The voice i am hearing on speaker has on speaker has lots of noise with it. i need ...
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0
votes
1
answer
24
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Change character sequence
I turn on the transmission of one key that works to open the door, but after a certain time I need to close the door, and for this I need to use the second key. I want to do without additional buttons,...
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1
vote
3
answers
758
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Generate a true analog signal using Arduino
I am looking for a way to create a true analog output with the arduino uno. I am constantly reading an analog input on a0 pin, all i want to do is send the same signal as output. I know arduino ...
1
vote
0
answers
134
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How to stop my 16*2 lcd blink?
Here I wrote code for my weighting scale measurement. In which I added an on/off switch for my LCD display. But in defined delay time my LCD is a blink and I do not want it. I want my LCD switch on/...
2
votes
0
answers
50
views
Am I maximising my A0 readout rate with this peak-detection code?
I have a pulse going into A0 on a Nano, and want to detect the peak voltage. With low-pass filtering to slow down the input pulse I'm still reading marginally too slow.
The code overall inhibits a ...
- 146
0
votes
1
answer
48
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How to shorten this code (because my sensor reads slowly)?
I'm making a fare meter for our school project. I have too much lcd.print code. This code is not finished yet. My only concern is how to minimize the usage of lcd.print. I think it's the one that ...
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0
votes
3
answers
71
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I have made a Nano send 4 pot values to an Uno please help with code
Happy New Year!
So I have made a Nano send 4 pot values to an Arduino Uno over serial but I have a problem: I don't know how to separate these values. Here's the code:
Master:
int Pot = A0;
...
1
vote
2
answers
91
views
Code Optimization: Interrupt when a value reaches 0
I have this working program that I wish to improve efficiency as much as possible.
It will blink slow, then faster and faster until it restarts.
It works, but my main concern is, currently, I am using ...
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3
votes
2
answers
1k
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How to move a servo quickly and without delay function
Im trying to move a servo from one place to another while using the typical for loop you find in the servo's library example.
int lightON = 180;
int lightOFF = 90;
for (pos1 = lightOFF; pos1 <= ...
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3
votes
2
answers
100
views
How to move a servo with a function
Im currently moving a servo from one side to another by using the typical for loop like this:
int lightON = 180;
int lightOFF = 90;
if (buttonState == HIGH) {
digitalWrite(LED, HIGH);
for (pos1 =...
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-1
votes
1
answer
90
views
Port manipulation
My UNO having some stability issues because of heavy memory use, I'm now optimizing the code
now looking to reduce the digital read memory use with the help of port manipulation. I got the code for ...
- 41
5
votes
1
answer
375
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Does the compiled binary of a sketch include uncalled functions from a library?
I am writing a GUI using a TFT display and the Adafruit GFX library and its default font on Arduino Nano.
I want to be memory efficient and I assumed that the 'optimise for size' default setting of ...
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1
vote
0
answers
49
views
Automatic water pump Trigger System - I need my code FIXED
int out = LED_BUILTIN;
int strt = 3;
int stp = 9;
void setup() {
pinMode(out,OUTPUT);
pinMode(strt,INPUT);
pinMode(stp,INPUT);
}
void loop() {
while(true) {
if(digitalRead(strt) == LOW) ...
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0
votes
1
answer
46
views
How might I add a delay, close the servo and go to the start again?
#include <Servo.h>
Servo myServo;
const int piezo = A0;
const int button = 2;
const int yellow = 3;
const int green = 4;
const int red = 5;
int knockVal;
int buttonVal;
const ...
1
vote
0
answers
687
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 ...
- 111
0
votes
2
answers
438
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 ...
- 167
6
votes
4
answers
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 ...
- 185
1
vote
0
answers
39
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 ...
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2
votes
1
answer
66
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 ...
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1
vote
1
answer
235
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 ...
- 11
1
vote
0
answers
81
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 ...
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2
votes
1
answer
105
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 ...
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-1
votes
2
answers
37
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 ...
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0
votes
1
answer
76
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
1
answer
87
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 ...
- 113
1
vote
1
answer
810
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 ...
user57451
-1
votes
1
answer
480
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 ...
- 221
1
vote
0
answers
509
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 ...
- 55
0
votes
2
answers
212
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 ...
- 183
1
vote
0
answers
57
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
* ...
- 11
1
vote
0
answers
296
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 ...
- 121
1
vote
3
answers
113
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 ...
- 11
1
vote
0
answers
268
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 ...
- 111
-1
votes
1
answer
452
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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 ...
2
votes
2
answers
2k
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 ...
- 155
0
votes
2
answers
143
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(...
- 117
-1
votes
1
answer
173
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
0
answers
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 ...
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0
votes
3
answers
763
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;
...
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2
votes
3
answers
157
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 + ...
- 215
1
vote
1
answer
106
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
2
answers
552
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 ...
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