The process of improving the efficiency of a program such that is uses less memory and/or less computational time.
0
votes
1answer
23 views
FFT 8192 points with Arduino Due
I'm working with an Arduino DUE, trying to achieve a 8192 points FFT. I saw this post at Arduino Forum, but most of the links are broken.
http://forum.arduino.cc/index.php?topic=225204.30
I found ...
0
votes
1answer
106 views
Multiple if statements - stuck
I have a robot that uses two motors to skid steer. The robot gets input from three ultrasonic sensors (left, middle, and right) and a passive infrared sensor. If the robot detects a person in front of ...
-1
votes
1answer
44 views
Why is integer-to-string not working in this sketch?
I am using a Pro Mini to read analog values and to send them via serial.
Goal of the sketch is to stream these values to Serial as fast as possible, to obtain a steady stream of at least 1000 ...
-2
votes
0answers
23 views
How to fix these Arduino 101 BLE code?
I have been trying to understand this error message. I have tried changing it many times and I couldn't find out what was wrong. It would give me great assistance.
"Arduino: 1.8.0 (Windows 10), Board:...
0
votes
1answer
22 views
Arduino Mega prototype analog timer interrupts: newbie question
I am currently using an Arduino Mega with a fast vibration sensor to trigger the components operation (force sensor, temperature sensor) and also toggle sleep mode.
I am very new at this and I have ...
0
votes
3answers
17 views
Merging strings and constants causing scope errors
I'm getting a few errors when merging strings with constants.
Here's the pertinent code...
#define STATION_ID ABC123
#define STATION_PASS XYZ987
void loop(){
String path = "/weatherstation/...
2
votes
0answers
64 views
Faster output of Serial.print() data coming from TSL1402R sensor [closed]
I am reading a TSL1402R with an Arduino Mega2560. The code is based on the sketch from the arduino playground here:http://playground.arduino.cc/Main/TSL1402R
The application is a digital caliper for ...
3
votes
1answer
31 views
Read time digits from DS1307 and run code based on return
I am currently reading a DS1307 adafruit breakout board and I need to drive two nixie tubes from a shift register. The shift register is running two 74141 IC chips. I have code that loops through all ...
3
votes
1answer
86 views
PCF8547 Wire.write explanations
I am using an ESP8266-12E with a PCF8547.
I have managed to turn on and turn off LEDs using these two things.
I am using these three commands to do it.
Wire.begin(SDA_PIN,CLK_PIN);
Wire....
1
vote
1answer
43 views
Sim800L's library can not compile on Arduino Due
Sim800L's library can not compile on Arduino Due. Is there any way to create a library for Arduino Due?
#include <Sim800l.h>
#include <SoftwareSerial.h>
Sim800l Sim800l;
char* text;
char*...
0
votes
1answer
50 views
Is it possible to pass HIGH and LOW values as parameter in a function?
I've created the following function:
void runMotor(int _dir, int _step, int wait){
digitalWrite(_dir, HIGH);
for (int x = 0; x < 3200; x++) {
digitalWrite(_step, HIGH);
...
1
vote
1answer
40 views
Code Optimisation [closed]
I have tried fading the RGB Led with different colour format and sequence.
Working of Code :-
When value of number is 1, the Red LED fades gradually and glow up with the delay interval of 10ms with ...
1
vote
1answer
73 views
Results for GP2Y1010AU0F Dust Sensor
I am using Dust Sensor GP2Y1010AU0F
I downloaded the code from the manufacturer here:
http://www.waveshare.com/wiki/Dust_Sensor
/**********************************************************************...
1
vote
1answer
23 views
ble_write slows down my sketch causing problems (Blend Micro & NRF8001)
I'm working on a prototype which uses the RedBearLabs Blend Micro with the NSC's nrf8001 ble chip, but have ran into a problem that I'm not sure how to solve.
I have two tactile buttons connected to ...
1
vote
1answer
63 views
Help avoiding floating point math
I'm using a Texas Instruments DRV2605 haptic controller in my project to drive a LRA vibration motor. I would like to calculate the LRA rated voltage during run time using the formula below as ...
0
votes
3answers
379 views
How do I repeat a piece of code
For a school assignment I need to make a LED blink on/of 3 times then stop.
Now I have come up with the following code:
I think it's ''clean'' enough for what it has to do, but I have a feeling that ...
2
votes
3answers
204 views
A more elegant way to deal with timers without using delay()?
I am looking for a more elegant way to write a function that performs timer-based tasks as in the case of the code below, which essentially collects 5 sample values from a microphone module over a ...
0
votes
1answer
45 views
Faster and lighter approximate timing code without using timer
I want to use loop() iterations counter to execute some tasks periodically or tasks like debouncing. My other sketch is running every loop() at least 20 ms, and if i am using 5 ms time to wait to
...
3
votes
1answer
351 views
OOP vs procedural programming on arduino
It seems like the majority of Arduino applications are written without using classes / objects. Is there a reason for this? Does is slow down the Arduino or somehow present undesirable behavior?
4
votes
3answers
152 views
Set EEPROM from PC before program
I have been working on an arduino program, which has gotten rather large. I am close to hitting the 32k limit on Flash for my ATmega328p. I would like lower my program size by saving some of my many ...
1
vote
1answer
85 views
What is the proper way to implement PID?
I'm having some trouble conceptualizing how to go about implementing PID into my drone. There are a few ways I'm thinking about implementing the pipeline:
Having one PID Object for each of the six ...
1
vote
3answers
413 views
Storing an array of function pointers
I have some Arduino code that looks like:
char packet = ser.read();
switch(packet){
case 'a':
someobj.somefunc();
break;
case 'b':
otherobj.otherfunc();
...
0
votes
2answers
46 views
Interrupt numbering
I'm using an Arduino Mega and four of its interrupts. Each interrupt is only used to start/stop a timer, depending if it's rising or falling, so effectively runs the same function. Does anyone know if ...
0
votes
4answers
57 views
Refactor to save bytes?
I'm a painful 128 bytes of my max for this Trinket. Any refactoring I could do to get down the size?
#include <Adafruit_NeoPixel.h>
#include <Wire.h>
#include <RTClib.h>
#define ...
2
votes
2answers
81 views
Possible to condense this if statement?
I have this if statement:
if (now.hour() == 5 && now.minute() == 10 && now.second() == 0 && now.dayOfTheWeek() != 1 && now.dayOfTheWeek() != 7){
Is there a way to ...
0
votes
1answer
46 views
How would I refactor this code, given how similar most of the lines are?
I have a set of buttons and a set of NeoPixel LEDs. There's lots of very similar constants (button1pin, button2pin, etc) so there's almost certainly a more efficient way of coding this.
Any ideas?
#...
0
votes
4answers
88 views
Can I short this code?
int r = 12;
int g = 11;
int b = 10;
int sw = 4;
int x;
int c = 0;
void setup() {
pinMode(r, OUTPUT);
pinMode(g, OUTPUT);
pinMode(b, OUTPUT);
pinMode(sw, INPUT);
pinMode(13, OUTPUT)...
0
votes
2answers
462 views
Convert uint8_t array to ascii character for serial transmission
I am trying to send packets of via bluetooth data that include 6 bytes read from a sensor and stored in a uint8_t array. Instead of sending over the data as numerical digital, I would like to send the ...
1
vote
2answers
49 views
Port Manipulation - fastest implementation
I'm working on an Arduino program but am getting bogged down on what is the 'correct' implementation. I understand that multiple versions may work, so for my needs the 'correct' version will be the ...
-3
votes
1answer
110 views
How do I learn C? (was Computer project) [closed]
Can you help me writing a code for this question guys??
You have an Arduino Uno with 8 LEDs connected to digital pins 2 to 9.
Create an array of 8 elements. Fill it with random numbers between 2 and 9 ...
1
vote
2answers
55 views
Digital Vs. Analog Sensor
Background: I'm using an Atmega1284P to add sensors to an off road racing truck onto a CANBUS network. The standard automotive sensors are thermistors, but the Dallas 1 wire temp sensors (DS18B20) ...
4
votes
2answers
101 views
Problem with inaccurate delays between sensor readings
During the last two months I have been working on a project that consists of using a Seeeduino Stalker V2.3, two AM2305 sensors, a TSL2561 sensor, an HC-05 XBee module, a 1,800 mAh 3.7V LiPo, a 7 cm x ...
0
votes
2answers
74 views
How to prevent inclusion of unnecessary libraries?
How do you save space by preventing the inclusion of unnecessary binaries?
When I compiled the ROS Blink example, I received the warning:
Global variables use 1,951 bytes (76%) of dynamic memory,
...
2
votes
4answers
2k views
What is better: one sprintf() or multiple strcat() and itoa()?
I was creating Arduino function which sends two int and additional chars between them and at the beginning and end of char array - then print that array to the serial port in almost real time. (For ...
1
vote
1answer
278 views
Arduino Due SPI speed reduction
I need to reduce the SPI clock speed of the Arduino Due down to about 100 kHz. Unfortunately my hardware doesn't support higher speeds.
With the current maximum divider of 255, I can only reach a ...
1
vote
0answers
36 views
Phone-Arduino system [closed]
Is there any application or program that can allow a user to change particular parts of a code? The user types in some defined "instruction" into their smartphone and it changes say the intensity of ...
2
votes
2answers
112 views
How do I set a constant in setup() that I can use in loop()?
I am new with coding, and I was wondering how I could run something once and define it as a constant. Here is my code:
int sensorValue1 = analogRead(A0);
int sensorValue2 = analogRead(A1);
int g0 ...
0
votes
3answers
212 views
Arduino: how can I stop while() when bluetooth send a data?
I have learned Arduino for a month, and I want to bulid a car with 2 modes,
Remote and Auto. Auto mode needs to have while() loop, so it can receive data from sensors. When I choose Auto mode via ...
0
votes
1answer
360 views
Using for loop to set pinMode
I notice problems with my output pins when I use this method of setting their pinMode:
int allOutputPins[] = {3, 4, 9, 10, 5, A3, 11, 12, 7, 8, A1, A2};
for(int a = 0; a < sizeof(allOutputPins); ...
0
votes
3answers
91 views
How to store IR data needed for AC controll in less space?
I'm trying to controll an AC unit but the issue is space - right now, I store the data like this:
consts PROGMEM unsigned int Signal_Heat_Fan0_Temp30[] = {233,636,17884,3032,8944,500,496,492,1496,524,...
1
vote
3answers
120 views
Are static variables in a function bad?
For my code I use a couple of static variables.
But when I search the internet, they seem "evil".
For example: I have a function which will be executed every loop (5ms looptime).
to increase the ...
-1
votes
2answers
397 views
SD Library writing char in a file
I'm trying to write into a file using this code from the example of the library:
String dataString = "";
int sensor = 0;
dataString += String(sensor);
dataString += ",";
sensor +=1;
File dataFile = ...
0
votes
3answers
60 views
Simple question about && vs ||
I want to skip all '\r' and '\n' chars and I have IF statment:
char c = Serial.read();
if (c != '\r' || c != '\n') { // <- This line interesting
mAnswer[mAnswerLength] = c;
mAnswerLength++;
...
1
vote
2answers
2k views
How to read code from Arduino Uno to Arduino IDE? [duplicate]
we can upload a code into Arduino UNO from our computers, but how about reading code? Can we read and get C codes from compiled codes from Arduino hardwares? My second question is that will we read ...
0
votes
2answers
176 views
Light sensor acting up when used with other code
I have a light sensor that works fine and outputs the correct data to the serial monitor when I only upload the following code to the nano:
const int lightSensorPin = A0;
int lightSensorValue = 0;
...
1
vote
1answer
34 views
How to int variables with similar names without tons of code? [duplicate]
I'm using int with 14 LEDs to specify pins, but I don't want to use int 14 times, like this:
int led1 = 2;
int led2 = 3;
int led3 = 4;
int led4 = 5;
int led5 = 6;
int led6 = 7;
int led7 = 8;
int led8 ...
2
votes
1answer
91 views
Cleaning up code? Removing repetition?
I am using Adafruit motor shield, I am running multiple DC motors for different amounts of time, but to start at the same time - I have researched that to do this I have to monitor the elapsed time of ...
0
votes
1answer
107 views
Shortening large chunks of code
Some of the code that I have is unbearably long and drives me insane. I don't know if there were simpler ways to doing what I am doing.
long turn1;
long turn2;
long turn3;
long turn4;
long turn5;
...
6
votes
1answer
166 views
Overview of compiled code size
When I compile my code, the Arduino IDE returns the binary sketch size in byte.
Is there a good way to find out (approximately) what function or what part of my code takes up how much memory in ...
0
votes
2answers
536 views
Program button to switch between two values
There is a function on one of my programs I want to be switch on and off by pressing a button. The button is unbiased otherwise I would set the function to read the button's status of HIGH or LOW.
So ...