Questions tagged [sketch]

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

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Is there a way to upload a code to Arduino without using Arduino IDE? [duplicate]

I have Arduino code, I want to upload to Arduino without the use of Arduino IDE, how can I do this? I have a Arduino which is connected to my PC, I don't want to write the code in other language, just ...
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How to get started with writing code for a Hall Effect sensor?

One of my biggest questions concerns coding a Hall effect sensor to find wheel speed with an arduino mega. I’ve got an lcd in digital pins(7,8,9,10,11,12) and a Hall effect sensor in digital pin 2. I ...
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How to change variable/sketch through a GUI

Over the past few months, I've been working on a wearable computer mouse using an Arduino and a 9-dof sensor. Most of the sketch is complete, and works as expected. Recently, I started investigating ...
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2 answers
91 views

(noob) 2 servos for robot (head & chest) movement at different speeds at once

I have an Arduino Uno and two Hi-tec Servos HS-40 & 5055 digital that I'm using for a basic robot build. I'm trying to have 1 servo(HS-40) turn the head back and forth (left to right) slightly ...
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I have 2 sketches with same RTC DS1307 but when I combine the 2 sketches it gives errors [duplicate]

I have 2 sketches one is pixel clock with RTC ds 1307 and the other is 7 Segment with DHT 11, I want to merge the two into one but it is giving errors for rtc. sketch for pixel clock #include <Wire....
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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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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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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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5 votes
3 answers
828 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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-1 votes
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989 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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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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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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4 votes
2 answers
688 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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1 answer
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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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2 answers
715 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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2 votes
1 answer
223 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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1 answer
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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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1 answer
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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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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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1 vote
0 answers
177 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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-2 votes
2 answers
147 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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1 answer
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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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1 vote
1 answer
453 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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1 vote
2 answers
112 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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1 answer
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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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1 vote
2 answers
83 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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1 answer
186 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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1 answer
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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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1 answer
377 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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2 answers
791 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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2 answers
261 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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0 answers
87 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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1 vote
1 answer
83 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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2 votes
0 answers
175 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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1 answer
268 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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  • 171
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2 answers
93 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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1 vote
2 answers
155 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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1 vote
1 answer
85 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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1 vote
3 answers
236 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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-1 votes
1 answer
544 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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2 answers
72 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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1 vote
1 answer
157 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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1 vote
1 answer
1k 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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1 vote
2 answers
509 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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0 votes
1 answer
91 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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1 vote
1 answer
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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2 answers
521 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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0 votes
1 answer
193 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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1 answer
83 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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  • 45
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1 answer
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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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