Questions tagged [loop]

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Code is not looping correctly when running on battery

static const int dry = 570; static const int wet = 225; static const int RELAY = 2; static const unsigned long DELAY_1_S = 1000; static const unsigned long DELAY_1_MINUTE = DELAY_1_S * 60; static ...
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1answer
19 views

Breaking out of the arduino fingerprint enroll loop

I am using the Arduino's Adafruit Finger Sensor library, and it has an example to enroll a fingerprint. I want it to enroll one print and exit/break out of the loop because it currently enrolls a user,...
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1answer
24 views

Check if any of loop's insides returns 1 and hold it until the whole loop is 0 again

I'm new to this, so, please, don't crucify me. I have a function that checks if an entry in multilevel array is in a certain range. Using FOR loop I check the whole array with this function, which ...
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50 views

Looping a defined function to show live variables printed on OLED screen

I have started a thread on the Arduino forum. If someone could have a look at the thread and give me some help either here or there that would be great. (I don't want to have to add all the ...
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1answer
40 views

Is it possible to exit a loop on the change of an input state?

I would like to exit a particular loop if the state of an input changes from LOW to HIGH. This is the current loop: void brakeFade() { pixels.clear(); pixels.setBrightness(255); pixels.fill(16711680, ...
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1answer
40 views

Exit from for function after detecting obstacles

#include <HCSR04.h> int red = 13; int green = 12; int blue = 11; int trigger = 9; int echo = 8; int halt; void setup(){ pinMode(red, OUTPUT); pinMode(green, OUTPUT); pinMode(blue, OUTPUT)...
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1answer
38 views

Infinite loop serial.readString()

Ok, this is my code: int rosso = 13; int verde = 12; int blu = 11; int count = 0; String command_on, command_off; String s; String enough = "stop"; void setup(){ pinMode(rosso, OUTPUT); pinMode(...
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1answer
74 views

Stopping the program after 1 second

I am a Beginner in Arduino Programming. I am working on a project where I control A DC motor with IR sensor and arduino. Until here it is fine. But I want the Motor to stop after one second even ...
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3answers
77 views

Writing elegant applications for Arduino

Coming from a C background, I was taught that tight loops that just burn CPU aren't desirable. Is there any programming style guides on Arduino? Is it common practice to just let loop iterate as a ...
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3answers
50 views

How long does my digital pulse need to be for it to be read?

I have the following really simple code. On every iteration it'll read the first pin, and if it's high - do some serial IO. Then do the same with the second pin. Nice and simple, works during my tests....
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1answer
22 views

Do Loop query not stopping

I am new to Arduino programming and I would like to ask a question. Firstly apologies if this has been answered before and I understand if it gets locked if this has been answered elsewhere. I am ...
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1answer
40 views

Stuck in While loop!

I am using 4 LDR To track the sun for solar panels. Not using servos, but linear actuators(a little irrelevant but just to give scope) my code gets stuck in this while loop as soon as it enters it, ...
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2answers
81 views

Is there a way to make a function take an exact number of clock cycles?

Is it possible to use something like a compiler directive to pad a function with do nothing instructions so that as you add lines of code or take them away it always executes in the same amount of ...
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2answers
70 views

How do I run a function every 10th time through a loop?

I currently have a function that poles all my sensors every time through it's loop, but I want to pole one of the sensors only every 10th time. Currently there is a 10 millisecond delay at the ...
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170 views

Break a while loop with a push button (AccelStepper.h)

Disclaimer: This is my first Arduino project. Background: I am building a "rapunzel tower" lantern for my daughter: the witch pays a visit to Rapunzel meanwhile my daughter can read a book (or still ...
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52 views

While Loop does not stop when condition is false

Here's the code: void loop() { while (1 == 1) { ObsLeft(); while (SeeLeft < 50 || SeeLeft == 50) { Urong(); ObsLeft(); if (SeeLeft > 50) { Hinto; ...
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2answers
106 views

problem with decrement in a loop

I am trying to write a sketch wherein the led brightness increases in increments of 15 until it reaches 255. At that point I want to make decrements of 15 until it reaches 0. The increment part of the ...
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1answer
37 views

Servo Program Questions

Hi programming in arduino, I am trying to get a nested for loop inside a for loop with industrial servo which used PUL +- DIR+- (bought motor off amazon). My goal is to get the puls delay to increase....
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2answers
118 views

Arduino uno wifi rev2 stuck inside loop

It might be a stupid question but I can't figure it out. While running the code below. I want to open the box when the code matches the code in API. This all works. I can even close the box afterwords....
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5answers
133 views

How can an Arduino do multiple actions in parallel without interfering with each other?

I am working with my son (9) and we are having a great time learning. But, we've run into a problem and could use your help. We have two separate loops that we want to run without interfering with ...
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2answers
259 views

How to stop loop in the serial monitor?

I want to make a serial program with input from the serial monitor and show each character with its binary and ASCII codes. At the end of the program, I want to show the whole message sent from the ...
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2answers
100 views

Using the same variable between if-statements within loop()

I wonder if there is a good way to use the same variable value between two different if-statements within the loop(). Within the Servomotor section of the code, I want to use the value from the first ...
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1answer
36 views

Running in loop or once according to a slide switch position

I have a question. I made a system which includes a servo, a stepper and a wiper motor :) All these parts has one job to do and I can code it. But, I want to make 2 modes in this system Single ...
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1answer
27 views

ARDUINO flashing lights

I'm making a circuit with my Arduino so that when it receives a '1' or '2' or 'a' it turns on or off the LEDS. But I wanted the lights to flash and do not know how to do loops in loops or if that's ...
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2answers
48 views

Receive socket when in loop arduino (Interupt a while loop with a socket)

I'm currently working on an arduino project. Were the arduino is communicating with a NodeJS server via web sockets. The socket connection is working fine and has no problems. But the problem I ...
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1answer
41 views

Some Blocks of Code gets stuck in a loop, I do not know why

The code below Gets stuck at function "Led Off?" & "Check button". I'm using Blockyduino editor. The check button code was intended as a toggle switch for the lights. When I deleted "Led Off?" and ...
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44 views

Stepper motor only rotates once in a loop?

I am quite new to this , I am trying to program two motors , aStepper and bStepper. I want the program to rotate aStepper then rotate the bStepper and when that is done rotate aStepper again , and ...
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2answers
86 views

while(1) inside if conditional

if (!MDNS.begin("esp8266")) { Serial.println("Error setting up MDNS responder!"); while (1) { delay(1000); } } I know this will result in an infinite loop if the if conditional is ...
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66 views

Need sugestion to improve my arduino sketch

I want my code to blynk friendly by avoiding while condition in loop or flood error as mention by blynk. But , i m unable to do so.whenever i try to call function outside loop , it get stuck in first ...
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98 views

Stuck in a loop when reading from EEPROM, works if I clear it first

EDIT: The problem was caused by storing a pointer in the EEPROM. Thanks to @KIIV for helping out Sorry for the enormous of wall of text, I'm trying to pare it down a bit. I have two Arduino Megas ...
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99 views

analogWrite and For Loop Bug

I wrote the following code that outputs a packet data structure bit by bit. I do this using two for loops. These two for loops should always terminate, but the presence of analogWrite() makes them ...
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2answers
80 views

Running loop for a specific time period

I currently have a loop that runs without a time condition: unsigned long previousMillis = 0; // will store last time LED was updated int WET=4;//wet line int DRY=5;//dry line int Inhale=1000;...
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2answers
42 views

Syntax for stopping loop until the condition has made false

I am taking reading from temperature sensor and from that data. I have to control 3 LEDs. Lets consider LED1, LED2, LED3. If temperature range between 0-20 I have to HIGH LED2. else if ...
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1answer
194 views

Run light sequence function continuously in if statement

My goal - run light sequence function on momentary button press (button 2) continuously until another of the 3 momentary buttons are pressed. /* switch * * Each time the input pin goes ...
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1answer
45 views

How can I stop a loop when using a servo with a Key input?

How can I stop my following code using a key? Basically the code should run the servo in a loop if "t" is pressed and stop the loop if "s" is pressed. #include <Servo.h> Servo myservo; // ...
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1answer
61 views

How can I assign a variable to a function output in Arduino?

I'm trying to assign the output of my function (which adjusts a DAC output) to a variable so I can print and display it in my serial monitor. Here's the code #include <Wire.h> #include <...
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1answer
44 views

Wire SlaveReceiver : will the registered function in onRecieve interrupt/conflict with loop block?

I am currently researching on I2C, and I made a configuration that has MasterWriter that transmits data to a SlaveReceiver that will store the data received from Master, into an SD card, and then ...
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1answer
40 views

What features of the Arduino framework will fail if I use my own infinite loop in favor of the standard loop()?

I have a strong urge to replace the framework-provided loop() function with my own like so: __attribute__((always_inline)) inline void fastLoop() { } void setup() { // Performing setup here... ...
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31 views

Arduino and NodeMCU problem with wifi conecction

Hello guys I am beginner with micro controllers but I am trying to make a simple IoT with Arduino and NodeMCU as WiFi. I was using this tutorial and code https://www.electronicshub.org/wifi-controlled-...
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1answer
42 views

LED dimmer not fading out

I'm trying to make an LED go from no brightness to max and back down on a loop and I've encountered a problem I can't seem to crack. The LED will go to maximum brightness steadily as it should but ...
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0answers
25 views

Loop failure after unset amount of time

I am building an art piece that takes in input from three rotary encoders and two buttons. and outputs data to a large neopixel display and 2 large 4 digit seven segment displays. The displays are ...
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1answer
93 views

Arduino programming with multiple loops

I was trying to program my Arduino (along with a connected motor controller) to switch from cycle to cycle with this program. It doesn't seem to work however. There's still plenty of storage space ...
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1answer
29 views

There's an error I don't know how to fix

I basically have a bread board with an rgb led and a peizo buzzer with a photocell. I have the codes for both. If I put a code for the rgb, it works. If I put the code for the peizo, it works. Once I ...
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1answer
431 views

Passing variables for a PID in an interrupt

I'm needing to pass variables from my timerIsr() function to my loop() function. I have little experience with the Arduino language, I'm mostly familiar with Python so this has been quite difficult ...
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1answer
51 views

Class help - Same Object types seem to mix values with each other

I'm having issues with two objects of the same class type. I have a LED class, which has functions to fade in and out, a LED. In my code, I create two objects of this class, and on the board, I fade ...
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1answer
90 views

Run function when triggered

I'm trying to create a motion/fall sensing device. I have a sensor that continuously checks if motion and fall is detected in void loop(). If both motion and fall are detected, then I'd like to send ...
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2answers
167 views

Setting a pin to a continous wave output

Is there any way in Arduino to set a particular pin(pwm or not) to just generate a square wave out of the desired pin? For instance, I want to have two pins on my Arduino Uno that output two square ...
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1answer
64 views

How to write a more compact ANDed conditions with if statement?

I'm working on the rfid module and found an example that do it well. But it has a long testing the 5 bytes of the rfid received bytes, and I've tried to write it in a more compact way. I did it with ...
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2answers
71 views

Blinking LED's at changing rate

I am trying to blink two LED's, starting at slow rate then increasing to fast s follows: 1 on, 1&2 on, 2 on, 1&2 on, 1 on, etc. The blinks go through the loop twice then speed up and repeat ...
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2answers
158 views

How do you make a switch case run until another serial input is detected?

I am trying to create a Traffic Light Controller. There are three modes to the controller: Mode 1 - the traffic light operates RED-YELLOW-GREEN-YELLOW and should repeat * (The other modes are not ...