Questions tagged [sketch]

A sketch is compiled code that is uploaded to an Arduino board.

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Why does the LED state behave differently?

I wanted the sensor to be high when I press the button, but when DigitalRead does low, the LED turns on, when it does high, the LED goes off. Whereas when the digitalRead is high, isn't it supposed to ...
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25 views

Http Client requests

I am working on a project where the ESP 8266 sends a very long string about 3000 chas over http as client. Likewise sensor data are determined. The loop repeats itself every 250ms. Now I noticed that ...
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29 views

Aurdino EMG sensors and servos?

I'm new here and to the aurdino. I'm building a 3D printed robotic arm controlled by a EMG sensor. I purchased a V3 EMG board and leads on Aliexpress. Here's a list of the things I've purchase for ...
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34 views

Due examples for using DFPlayer mini

After researching many sketches on interfacing with the DFPlayer Mini, all of them include softwareserial.h which the Due does not use. So are there any example sketches for the Due interfacing with a ...
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496 views

Using Arduino as a standalone compiler

I mostly program in C/C++ so I conviniently have a GCC compiler for all my compilations. I was wondering if there is a special compiler for Arduino that can be used just like the GCC Compiler? Because ...
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1answer
296 views

Standard deviation and variance of an array of numbers

Looking for a simple way to get the variance of an array of numbers, that will compile with the Arduino compiler. Something like this c#: static float variance(double []a, int n) { // Compute mean ...
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1answer
52 views

How do I fix my code on the Arduino IDE App?

//www.elegoo.com #include <RobotIRremote.h> #define RECV_PIN 12 //Infrared signal receiving pin #define LED 13 //define LED pin #define L 16738455 #define ...
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1answer
139 views

I want to create 10 levels with one button but this code shows only level 1?

#include <Adafruit_NeoPixel.h> const int PIN = 4; const int NUMPIXELS = 10; const int BUTTONPIN = 6; int buttonState = 0; int PINState = 0; int level = 1; int dt = 100; Adafruit_NeoPixel pixels(...
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2answers
248 views

Can Arduino Sketch be used for production

There are lot of device support with the help of Boards Manager today and is on going in Arduino IDE. So I am curious to know about can one use those for production purpose. Or it is recommended for ...
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1answer
37 views

Leds become dimmer after they reach a certain brightness, why?

Even if I don't use buttons and I do an automated thing that makes the led brighter(Even the non-rgb one)after sometime it resets itself to a dimmer light, why?* int Gled = 5; int Bled = 6; int Rv; ...
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212 views

Can't Upload Sketches to Arduino Nano Every

first-time builder here. I just got my Arduino Nano Every in the mail from Mouser, and I'm trying to upload a modified version of the blink example to my new brand-new board. However, every time I ...
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1answer
131 views

Branchless programing on arduino?

So I've been looking into branchless programming to speed up code and I'm curious as to how exactly Arduino (or rather atmega328) actually reads machine instructions. Does it have a memory cache or ...
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427 views

Program Nano Every using UPDI port

I have and Arduino Nano and an Arduino Nano Every. I'm doing some experiments and trying to program the Nano Every from the Nano, using the UPDI port. I'm using tutorials like this one that does the ...
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370 views

nRF24L01 - Measuring distance using time elapsed

For school usage, my team and I are working on a wristband that will alert the user if they are too close to another wristband (for social distancing). The problem is measuring distance using radio ...
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1answer
217 views

Cannot send any UDP packets from ESP8266 Wemos D1

I am attempting to send sensor data from a battery-powered device using UDP. The goal is to send a datagram immediately after the wifi station awakes from sleep then immediately go back to sleep after ...
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84 views

How do i efficiently write this code for PS2 controller to USB convertion sketch for Arduino Pro Micro?

I am really new to coding and building stuff, so forgive me if it is anything offensive.i have been trying to convert my PS2 dualshock controller to USB using arduino. there is a library called ps2x ...
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2answers
122 views

Use an LDR to run a sketch

This may sound like a simple question but I have tried to find the right solution but all I find is the usual make an led blink and even I can code that nugget I am quite new to programming arduino ...
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1answer
41 views

Ardiuno DUE board. Sketch uploading Error

I am working on Arduino UDE board in Ubuntu 18.04. I've followed following link tutorial. https://www.arduino.cc/en/Guide/ArduinoDue#:~:text=Use%20your%20Arduino%20Due%20on%20the%20Arduino%20Desktop%...
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1answer
108 views

Master Reader/Slave Sender with Distance Sensor

I am currently working on a project and want to transmit the information from a distance sensor from one arduino the another, but what i receive in the master board are not the correct measurements. ...
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2answers
98 views

Bike Gear Indicator Coding Problem

Lack of practice I forgot many function of C & C++... Can anyone help me with this coding Please... I think this is The Main coding: Topic: Gear indicator I first found this, Gear_Indicator_Raw ...
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1answer
379 views

Getting error invalid conversion from 'const char*' to 'const uint8_t*

I have written this sketch, and I am trying to populate the array of wifi hotspots to set the value in html select using javascript dynamically. #include <Arduino.h> #include <Hash.h> #...
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2answers
53 views

Runtime compilation

I want to compile a sketch on Arduino Uno, while Arduino is running and not connected to anything else, and then run the compiled sketch automatically. Is this feasible? How?
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1answer
94 views

Controllino Mega and Fatek HMI

I have a setup that controls the rotation of two stepper motor using Arduino UNO, HBS860H stepper drivers, 4X4 keypad and LCD screen. I have replaced the Arduino Uno by a Controllino Mega and it works ...
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1answer
26 views

Update class attribute with attachInterrupt

I want to refactor this code /* YF‐ S201 Water Flow Sensor Water Flow Sensor output processed to read in litres/hour Adaptation Courtesy: www.hobbytronics.co.uk */ volatile int flow_frequency; // ...
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178 views

Im having another problem with my code the error is "redefinition of 'AF_DCMotor motor'? [duplicate]

Heres the code #include <AFMotor.h> AF_DCMotor motor(1, MOTOR12_8KHZ); AF_DCMotor motor(2, MOTOR12_8KHZ); AF_DCMotor motor(3, MOTOR34_1KHZ); void setup() { Serial.begin(9600); Serial....
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1answer
353 views

serial is print twice?

I have a problem , when send 1 or 0 by Bluetooth module the serial monitor print two time (RECEIVED SMS) . what's the wrong ? This is my code : char BluetoothData = 0 ; void setup() { // ...
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2answers
123 views

Check if the board is in sleep mode

I'm using seep sleep mode with UNO with a simple sketch that turning on an LED and then goes to sleep. as far as the ATmega328p datasheet in sleep mode part showing the wake up sources and deactivated ...
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62 views

Arduino Sketch Crashes in working procedure when adding extra call

I am trying to drive a couple of motors to make a car. I successfully wrote some code then tidied it up to procedurise it and it just kept crashing. I've put some debug code in and narrowed it down a ...
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1answer
43 views

Help, I want to turn relay constantly on until a difference is detected, but triggered only one instead

Help, I want to use arduino to control relay for electricity, i get data from a sensor and when a value is detected it should be constantly on until another detection triggered again, i can get the ...
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0answers
130 views

Arduino uno wifi rev2 error compiling sketch to board [duplicate]

I'm having an irritating situation with my Arduino Uno wifi rev2 board. I made an installation with an LCD, keypad and little servo motor. I first wrote the code for my regular Arduino Uno and ...
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1answer
172 views

How should I customize UIPEthernet constants?

I am using UIPEthernet to get an Arduino Nano to drive an ENC28J60 Ethernet Shield for a UDP-based application. I'm customizing a number of its #define parameters to change default settings to save ...
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2answers
59 views

NeoMatrix Button Troubles

I am creating a 20x15 LED Matrix using and Arduino Nano. My goal is to switch between different "scenes," if you will, using 4 buttons (I just need to run different code to make it display something ...
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2answers
115 views

How can I upload a sketch remotely from a distant location onto an arduino that is power by a battery

Of course after developing a success full embedded product the next step would be making upgrades to compete favorably with new products in the market. Well making upgrades would require making ...
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10 views

error in uploading code to arduino uno r3 [duplicate]

i bought genuino uno uno r3. installed ide on win 10 IDE version 1.8.9.few days ago it was working fine.two days ago it stoped uploading code with error.. "Arduino: 1.8.9 (Windows 10), Board: "...
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74 views

Why doesn't data return when I use Sim808 http request

Why is it that when i use this code for http request on DFRobot_sim808 , I get 'fetch over' message, that means that no data is being returned? char strings: char http_cmd[] = " HTTP/1.0\r\n" ...
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3answers
185 views

Arduino Nano - Strange problems

Update: The arduino works only when I connect 3.3v to reset pin. And I successfully uploaded a sketch but it stops when I disconnect 3.3v and reset. Update 2: -- Removed -- Update 3: Its working ...
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1answer
350 views

Is low memory warning based on a fixed number of on the actual sketch?

I have the following output of my sketch for the Arduino Mega so far: Sketch uses 25020 bytes (9%) of program storage space. Maximum is 253952 bytes. Global variables use 6919 bytes (84%) of dynamic ...
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2answers
69 views

Why does this take more byte?

I am only replacing a portion of my code where I want to use the first method but as you can see it is making my sketch size little bigger //if(iBPM >= 40 || iBPM <= 170 ) { char ...
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1answer
112 views

Please help me combine the two codes for DHT11 and SW-420 Vibration sensor for arduino in one program [duplicate]

The following is the code used for DHT11 Temperature and Humidity sensor: #include <LiquidCrystal.h> LiquidCrystal lcd(4, 5, 0, 1, 2, 3); byte degree_symbol[8] = { ...
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1answer
824 views

How Programing the nodeMCU Through OTA using GPRS?

How Programming the nodeMCU Through OTA using GPRS? Hi Everyone I need big help. Actually, I m using NodemCU one of my project. the setup in Remote location, that place dont have a wifi option so I ...
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3answers
489 views

What is wrong with my code? RGB potentiometer

Arduino programming has been a huge learning curve for me and I am trying to create a project with an rgb that's color is determined by a potentiometer. To where the further I turn it, the further ...
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1answer
77 views

Help with coding Arduino Nano to run fan through slide switch at specific intervals

I’m trying to use Arduino Nano to run my 5 V PC fan, which, I know it sounds crazy, it’ll be mounted on a piece of Tupperware that’ll control the airflow through it via the fan. However I have no ...
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1answer
2k views

Arduino Nano 3.0 CH340G clone cannot upload sketch from Arduino IDE [duplicate]

I connected my brand new Arduino Nano 3.0 clone with CH340G and installed the drivers. It detects in Device Manager as USB-SERIAL CH340 (COM6). Under the Tools menu, i selected the correct board, the ...
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2answers
311 views

Interrupt triggering using DHT-11

I am new at arduino. I want to write a sketch that would print the message if the temperature grows greater than 30 C. Here is my sketch can you please tell me what's wrong with it #include "DHT.h" #...
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1answer
145 views

millis() replace delay() question

// each "event" (LED) gets their own tracking variable unsigned long previousMillisLED12=0; unsigned long previousMillisLED13=0; unsigned long previousMillisLED3=0; // different intervals for each ...
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1answer
70 views

Please explain the void loop() section of the sketch

#include <VirtualWire.h> int PWMB = 5; //Speed control void setup(){ Serial.begin(9600); //receiver setup vw_set_rx_pin(2); vw_set_ptt_inverted(true); vw_setup(2000); ...
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1answer
71 views

please explain the sketch attached

Sorry about a newbie. 1. what mening of: if(Xstr[XstrLength-1] != '|'){ Xstr[XstrLength] = '|'; Xstr[XstrLength+1] = '\0'; the setup: char Xstr[60]; what means? and then: itoa(Yint,...
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1answer
426 views

Arduino New Optiboot Bootloader on custom ATMega328p board, ATMEL Studio and AVRdude [closed]

I am about to ask a kind of complex question due to the number of system parts involved and the system architecture I am planning to use. First of all I have a tiny bit of experience with the Arduino ...
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1answer
124 views

The sketch burned two H Bridges, need help to find out how to modify

This is Arduino RC control car, the sketch tested good in a small motor, but burned two 60A drivers when put into 24V,500W motors, need help to find out whats wrong? #include <VirtualWire.h> //...
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12 views

Problem with uploading sketch [duplicate]

Arduino: 1.8.9 Hourly Build 2019/02/04 10:12 (Mac OS X), Board: "Arduino/Genuino Uno" Sketch uses 2078 bytes (6%) of program storage space. Maximum is 32256 bytes. Global variables use 189 bytes (9%) ...

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