Questions tagged [programming]
The process of designing and writing source code as part of a program (or sketch) for Arduino. For questions about uploading code to an Arduino board, use the [uploading] tag instead.
1,637
questions
3
votes
0
answers
29
views
How do I use a transmitter and receiver to send string messages conditionally to a receiver?
I'm working on a project to build a plant monitor that works from the outside with Arduino that picks up light and water values from it's environment then uses a nRF24L01 with an antenna and I've come ...
- 31
1
vote
1
answer
34
views
How to drive two Stepper motors and use an Ultrasonic sensor together?
I am working on an autonomous robot using two 4-pin stepper motors, HC-SR04 ultrasonic sensor, 2 L298N motor drivers (one for each motor), and an Arduino Uno. My problem is that when I use the stepper ...
- 75
0
votes
0
answers
26
views
Arudino Uno: Servo Example Sketch signal: killed Compilation error: signal: killed
I'm currently trying to run a C++. Arduino sketch but I keep getting the error signal: killed Compilation error: signal: killed no matter what sketch I run, this happens both when I verify and when I ...
- 11
0
votes
1
answer
24
views
How to write single binary code to output pin
I am relatively new to arduino and coding in general and im just looking for a code to write a single string of binary code e.g.; "01000111101"
To a specified output pin instead of copying ...
- 11
-2
votes
0
answers
61
views
what is wrong with my code? it is not working [closed]
#include <LiquidCrystal.h>
LiquidCrystal lcd(12, 11, 5, 4, 3, 2);
int LEDR = 8;
int LEDB = 7;
int LEDGr = 6;
int Button = 9;
int COLOR;
int Beep;
int PSE;
int TME;
int RTME = 0;
void ...
- 5
-2
votes
1
answer
39
views
4 corner weighing system
I have seen multiple videos on how to make a single weighing scale. Is it possible to use 4 small pads to weigh each corner of a 1/32 scale car and show the results on one screen?
- 5
-1
votes
1
answer
23
views
Arduino-project with color sensor and rgb-led
I want to use a color sensor for my Arduino project with Arduino Uno to detect the colors red, green, blue, orange, yellow purple of leaves of paper and then light my RGB led in those colors. I have ...
0
votes
0
answers
22
views
stepper control with buttons
Do need help in to trying to control a stepper motor with a overshoot protection.
I am using a Nema17 with a A4988 driver to control a loading plate. The pate holds racks which get loaded. when 1 rack ...
0
votes
0
answers
26
views
UNO like Device, Loaded BootLoader, Cannot Load Sketch [duplicate]
This is not a question about the Duemilanove bootloader. This is a question about one of 15 units that will not load a sketch. Something in one out of fifteen is different and I am looking for ideas ...
1
vote
0
answers
26
views
how to config size USB mass storage arduino nano ble 33?
I see that they arduino nano ble 33 support USB 2.0. Is there a way for us to create a USB mass storage of about 200kb for convenient storage of configuration files and history files?
I see example ...
0
votes
1
answer
58
views
RFID card read loop seems to stop
I successfully programmed an RFID card reader to switch lights on and off if any rfid card is presented. I have tested this and it works, with the lights continually switching on and off if any rfid ...
1
vote
0
answers
39
views
What is the most simple sketch to confirm the DAC works for audio on a speaker with it's own amplifier for an ESP32?
I have a PC speaker with it's owner power supply (no amplifier needed). It just uses a standard AUX jack.
Most examples sketches use an amplifier like the MAX98357A. I have explored some libraries too,...
- 194
-1
votes
0
answers
31
views
How can I control arduino HID wirelessly
I am relatively new to Arduino creations and want to make a USB Arduino device that will press multiple keys when it receives a Bluetooth signal. I think I have the HID part figured out after ...
- 1
2
votes
0
answers
19
views
Help with program upload problem!
I'm gonna to upload some code to my LeArm using an Arduino board. I connected the rx and tx pins of the LeArm to the Arduino, but I got an error message when I tried to upload the code. I'm not sure ...
- 21
1
vote
0
answers
47
views
How can I program an Arduino Pro Mini with an ESP8266-01 connected to its TX and RX?
I am working on a project that uses an Arduino Pro Mini to gather information from various sensor. Once the readings are taken I turn on an ESP-01 from a separate dedicated 3.3v power supply. The ESP-...
- 161
0
votes
1
answer
133
views
if statement does not work with fraction, but works with decimal equivalent
I'm trying to trouble shoot a problem with my code and narrowed it down to my if statement not working with a fraction.
The below code does not work and returns 0
for(float i=0; i <= 1; i += .0001){...
-1
votes
1
answer
18
views
Creating an IPAddress object from an unsigned int
If I create an IPAddress object using a decimal IP address, it appears to be reversed.
What am I doing wrong? See code examples below.
IPAddress addressOne(192,168,50,1);
Serial.print(addressOne); ...
1
vote
0
answers
38
views
How to save the current SPI settings with out have a global variable keeping track?
I am making a function for one of my devices, my device needs a particular SPI setting. I was hoping to save the current setting of the SPI class into some variable, load in the required setting, do a ...
- 231
0
votes
2
answers
50
views
Lora to Mqtt sensor cannot be read
I'm trying to transfer data from a temperature sensor that is located outside my wifi area. I have chosen the Lora technology between an ESP32 equipped with an SX1278 and a TTGO Lilygo lora.
So far ...
- 9
-1
votes
1
answer
56
views
how to "skip" one parameter of a method with a default value letting it use it's default value, but change parameters after it [closed]
lets say we have a function like this(fictional):
function1(int Z, int X, bool Y=true, int Count=10, int ID=1,bool TeaTime=false);
And I want to run this function, but I want to change all parameters,...
- 144
-1
votes
2
answers
213
views
Execute a loop function out of the main loop() [closed]
I am having trouble with part of my code.
I am working on a program, that using a sensor and a dfplayer, should play a track and while the track is being played, a LED should be turned on with a fade ...
1
vote
0
answers
138
views
ESP8266 not sending text message to telegram bot
I've been trying to get my esp8266 to send a message to a telegram bot as soon as it connects to the wi-fi, whenever it encounters an obstacle, or whenever an SOS push button is pressed. But I didn't ...
- 11
2
votes
1
answer
80
views
Arduino hangs / freezes - can't figure out why
I am building a remote controlled boat. My remote project freezes after an arbitrary amount of time. The serial stops output, the OLED doesn't update anymore and instructions are not send / received ...
- 21
1
vote
0
answers
30
views
Atmega328P constantly restarting when defining a function
I wanted to make a simple led on/off program using USART interface. When the code doesn't have any functions other than main it runs fine, however Arduino keeps resetting when one is included. At this ...
- 19
-3
votes
1
answer
116
views
Using internal voltage reference for sensor
i am using 3.7~4.2V lithium battery. I am using internal voltage reference to read constant battery voltage as we know that the battery voltage level depletes overtime. The problem is that my sensor (...
1
vote
1
answer
101
views
Will an Arduino Nano work instead of Teensy 3.2?
I hope this is ok to post here and I appreciate any suggestions or help and opinions/facts to make this work.
First off I’ve Never programmed an Arduino device!
I was looking at this project:
https://...
- 19
-1
votes
1
answer
74
views
RGB LED randomized colors and LDR fading at the same time
Im trying too make an RGB LED that keeps changing color's randomly, and makes the brightness fade at the same time with an LDR, yet I keep getting an error that says too many arguments to functions.
...
0
votes
2
answers
124
views
How does Arduino handle passing this union?
I'm unsure how this will be handled by the Arduino compiler. If anyone can explain what and why, I'd appreciate it. This is obviously very simplified, but it does contain the actual issue.
At the ...
- 231
-2
votes
1
answer
84
views
Arduino code giving error while compiling [closed]
I am a beginner, and I'm trying to make code to control a servo using two ultrasonic sensors.
I've tried to make the code, but when I tried to compile it using my simulation app, it gives this error:
...
- 57
0
votes
1
answer
57
views
is there Raw RTC output?
I have an I2C Real Time Clock, DS3231 RTC module , and I just want something like Unix Time.
I'm using the uRTCLib, looking at the class methods
but dont see anything like that. I'm thinking there ...
- 882
3
votes
1
answer
100
views
Detecting an approximate angle/location of a light source using phototransistors
Note: [I am approximately two weeks into learning Arduino and hence have little experience with utilizing Phototransistors.]
My plan revolves around placing four identical Phototransisors which are ...
-1
votes
1
answer
47
views
4x3 keypad not providing any output and the output it does provide is incorrect
I am trying to figure out how to use a 4x3 keypad and just want to receive the key numbers I select on the serial monitor. The problem I am getting is that some of the keys I type don't give me any ...
1
vote
1
answer
171
views
Run encoder code simultaneously with other code in Arduino
volatile unsigned int temp, counter = 0;
int county=0;
void setup()
{
Serial.begin(9600);
pinMode(2, INPUT_PULLUP);
pinMode(3, INPUT_PULLUP);
attachInterrupt(0, ai0, RISING);
...
- 11
1
vote
0
answers
70
views
Nucleo F446ZE VS Nucleo F446RE
I don't know if this is the right forum to ask this, but I can't find people that want to help, so let's try it here...
First I had an F446RE, and program it in PlatformIO with an Arduino Framework...
...
- 11
-1
votes
1
answer
103
views
How to write a program to do 2 different loop | Task?
I wanna write a program for rc-plane navigation
The plane must navigate to 2 waypoints waypoint_1 & waypoint_2
When it reaches to waypoint_1 (with miss-distance =< 5) then navigate to ...
- 97
0
votes
0
answers
51
views
ESP32 DEV Module with fixed IP-Adress and OTA
I've been trying to use OTA on a ESP32 with fixed IP-Adress.
I am using the ArduinoOTA Library: arduino-esp32/libraries/ArduinoOTA at master · espressif/arduino-esp32 · GitHub
In the code OTA without ...
- 69
0
votes
2
answers
633
views
The same button with one click and double click [closed]
i hope to get some help with my code.
I am trying to distinguish between a single press and a quick double press of the button with debouncing.
I am making some silly mistake in my code and i can't ...
- 69
-1
votes
1
answer
123
views
Buttons pressed in correct order
I’m trying to figure out the best way of doing this, currently using a bunch messy if-statements which kind of work. I have an IR sensor and three buttons that all need to be activated in the right ...
- 23
1
vote
1
answer
886
views
How do I control the speed of a 2-wire fan with an Arduino and only a potentiometer?
I am trying to vary the speed of a 2-wire fan by using a Arduino Uno and only a potentiometer.
Initially, I assumed that I could go about doing so by using a code that I used for dimming an LED. When ...
- 13
1
vote
0
answers
60
views
Need help with calling an API using an Arduino system
As stated in the title, I need help with calling an API. I'm trying to integrate make a call using the Verkada API but it seems to be using a cURL library that I'm not entirely certain I can get to ...
- 11
0
votes
1
answer
286
views
CRC8 code not working properly
I need to send a string followed by its CRC8, 0x31 polynomial (= X^8 + X^5 + X^4 + 1), I've coded this successfully after some troubles, but it doesn't seem to work properly when I check the results.
...
- 11
2
votes
0
answers
179
views
Coding issue with Fast LED Multiple Colour Palettes in a State Machine
I am working on a project using the WSB2812B LED strip, with a ATmega644A using the MCUdude/MightyCore plug in (https://github.com/MCUdude/MightyCore).
I am using Fastled 3.3.3 with Ardunio 1.8.13 on ...
- 21
1
vote
1
answer
232
views
Motor with ultrasonic sensor
I am new to programming so bear with me.
I am writing a simple code to control a motor such that the motor will turn at full speed as long as the sensor does not detect an object within 5" of the ...
- 19
1
vote
1
answer
96
views
memory leak w/ no Strings involved
I'm trying to read data being transferred via Infrared from my Smartmeter on my ESP8266 using the following sketch:
#include <ESP8266WiFi.h>
#include <ESP8266WebServer.h>
#include <...
- 21
-3
votes
2
answers
342
views
Error when compiling program for esp32 with Preferences.h
I'm trying to write a program for an Adafruit ESP32-S2 TFT Feather. I However cannot get it to compile my program involving any use of <Preferences.h>. I can't get Arduino IDE to compile even ...
- 11
-2
votes
1
answer
346
views
Convert Int to HEX, HEX to string and to byte? General converting problem
Since Cpp is not my main language, I struggle to find the best way to convert between types for my needs.
So my starting point is
struct can_frame {
canid_t can_id; /* 32 bit CAN_ID + EFF/RTR/ERR ...
- 99
0
votes
2
answers
160
views
Multiply char with float
I have a value for led brightness that is stored as an unsigned char (0-255)
unsigned char* colors[3];
colors[0] = 255;
colors[1] = 0;
colors[2] = 0;
I want to multiply a brightness percentage to ...
- 111
1
vote
1
answer
408
views
Mouse.move: how do I move the mouse to the center of a screen?
I have a program operating in full screen mode. I would like to move the mouse to the center of the screen. Is this something I can do with the functionality of Mouse.h?
https://www.arduino.cc/...
- 882
-2
votes
1
answer
45
views
How to set number in address field?
I want to build structure of record. The problem is that I can't build the address field correctly. Can any one help me?
P.s: the address[16:2] is start from bit 61 to bit 47 so please you can't say ...
0
votes
1
answer
106
views
L LED keeps staying on
I am trying to get the Arduino to reboot my PC when it is off.
Using the front panel header on the PC, I connected the power switch and PLED directly to the Arduino Uno as the header only outputs 5 V.
...
- 11