Questions tagged [library]

A library is a file that can be included into the code to add new instructions by combining many existing instructions and creating one easy to use instruction to call.

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Touch sensor trouble

I need help I use Touch Sensor(T)v.0 and it always receives a signal not matter I touched it or not. Here is the code. #define TOUCH_PIN 7 int touchVal = 0; void setup() { Serial.begin(115200); ...
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42 views

LiquidCrystal_I2C may be incompatible with your current board message

I am trying to get the LED to blink the message in the code. However, I keep getting an error message library LiquidCrystal_I2C-master claims to run on AVR architecture(s) and may be incompatible with ...
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generate and using a precompiled library ESP32

I would like to ask you how I can generate a dot_a file for a given library for ESP32? I want to replace my .cpp file with a precompiled .a in the Arduino IDE. Is that possible? Can you please guide ...
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1answer
42 views

Arduino IDE - scope of the pre-processor “#define”

I'm creating an Arduino library and have 3 files - a "test.ino" program, and two library/class files: "testLibrary.h" and a "testLibrary.cpp". The library makes use of ...
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LF: flexible scheduler/timer library

I'm working on a few arduino projects where I've needed a flexible scheduler and/or timer library and was wondering if anyone has a library they recommend? Case 1: I have a sensor that needs to ...
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74 views

How to use this confing function

For INA3221 current sensor, I found this library, however, I don't understand how to use the INA3221SetConfig() function as defined in the .cpp file link. void SDL_Arduino_INA3221::INA3221SetConfig(...
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1answer
89 views

Library for working with a 4-digit 7-segment indicator SH5461AS

Good day. Tell me an excellent library for working with a 4-digit 7-segment indicator. I am currently using #include <fDigitsSegtPin.h> But it does not allow you to display letters, does not ...
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36 views

Piezoelectric buzzer interfacing with arduino without using any library

I want to learn programming from the roots, so i have started learning interfacing different modules with arduino without using any libraries. i want to learn how to interface piezoelectric buzzer ...
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Uploading code with other libraries [closed]

I'm working on a very big project and want to upload this to GitHub for people to use (flight controller software) and I'm using libraries from other people to make the process in the beginning easier ...
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1answer
21 views

Library ADC MCP33121

I'm looking for the Library of the ADC MCP33121 for Arduino UNO or functional code, I don't have enough tools for testing so I'd like to get some code already tested. I appreciate any help. Thanks... ...
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67 views

Not able to build program with arduino program under clion

I'm pretty new to arduino and I just downloaded clion and installed the arduino plugin so I have an IDE that I'm used to. Here is my code: #include <Arduino.h> // Time between a switch ...
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query of arduino sketch with regards to employment of gsm sim900a module

what i'm trying to do is to send message to one whose no. is used in code about balance of sim_card plugged in sim900a. but i get commands in message or blank message after using ATE0. what i was ...
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1answer
39 views

What pins to use on a Teensy to get data from multiple peripherals?

I'm using a Teensy to keep records on the location, speed, altitude, and direction of a weather balloon I'm hoping to launch. I have an Adafruit LSM9DS1 and a Ublox NEO-M8N with compass (HMC5833L) so ...
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'class Adafruit_SPIDevice' has no member named 'endTransaction'

So what I have done is followed all of the instructions in the following link: https://learn.adafruit.com/adafruit-pygamer/setup and have managed to get all the way up to https://learn.adafruit.com/...
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1answer
72 views

Adafruit_Arcada' does not name a type;

I am trying to program an adafruit pygamer (which says it's compatible with Arduino). I have added the ZIP folder for the library into the library folder om my PC where all of my folders are supposed ...
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Read & write on Winbond SPI flash using Arduino UNO

Recently I have brought a original UNO for modifying and flashing various types of bios. I had a dedicated one click bios programmer which was very expensive but few days ago it failed. So I thought ...
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1answer
49 views

Arduino stuck in PT_WAIT_UNTIL

I am using the Protothread Library from Adam Dunkels. It is supposed to wait 1 second and then continue. But instead it gets stuck there and everything after that line is not executed. lastTimeBlink = ...
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Arduino Nano 33 IoT not connecting to WiFi

I have been using my Nano 33 IoT for a while now and it has been behaving perfectly. All of a sudden though, I just cannot connect to WiFi. I am using the WiFi Nina library. Everything is updated to ...
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1answer
95 views

Trouble with Arduino Nano Every and radio transmission using RH_RF69.h

I give some help for students working on the Cansat Contest. I am trying to connect a RFM69 Radio Module to an Arduino Nano Every. Nothing works : compiling the simpliest program: #include <RH_RF69....
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Why do I get error “Error compiling for board Arduino Uno” with my mpu6050 video stabilization code?

This is the code I'm working with. I'm using it for video stabilization system. It was working fine but for some reason now it gives me this error? Is it because I deleted the library and installed ...
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30 views

listener for Plotter library doesn't work

I try to use Plotter to plot some data from my Adafruit Circuitplayground board, but the listener is kept showing "Scanning serial ports..." and not displaying any plot (as shown below in ...
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38 views

I have a bunch of libraries but all of them are came as .ino files. I need to turn them into .h files

I recently bought an arduino starter pack online, did some poking around, and learned that I have to install the libraries to get them to work for my projects. The issue is, they all came as .ino ...
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1answer
38 views

I get an error?

void setup() { Serial.begin(9600); pinMode(13,OUTPUT); } void loop() { if(Serial.available()>0) {s_num =Serial.read();} if(s_num=='0'){ digitalWrite(13,HIGH); delay(100); //the specified time for 0 ...
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1answer
43 views

What are a few good ways to connect multiple I2C busses?

I have an issue with a project. I have a backplane with an Atmega328P based microcontroller controlling an I2C bus with multiple peripheral devices. One such peripheral is a removable card with ...
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46 views

ESP32 Ticker Vs ESP8266 Ticker inside a class

I'm trying to create a class including Ticker library when using ESP32. A question asked here, concluded the situation. BUT after answered, I could not understand or even implement the answer. Please ...
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1answer
146 views

Alternatives to Nextion display

I am wanting to have a display where I can design the GUI on a program and then somehow transfer it to the display. For the graphics I want to make, it would be really hard to manually write the code. ...
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1answer
43 views

Code hangs with SPI, and OLED labraries (Possible conflict between Adafruit SSD1306 and hardware SPI libraries)

I have an issue with using two libraries together, namely SPI.h that is installed together with an Arduino and Adafruit_SSD1306.h. My code was getting stuck so I stripped it down to the bare minimum ...
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1answer
117 views

TinyGPS++ Question about gps.encode(ss.read())

I am trying to make an oled gps display, however when looking at multiple examples and other people's code, I am seeing that people are using different methods. I see some code that has gps.encode(ss....
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1answer
62 views

What wireless protocols can be used with arduino?

Before you close this saying it's not related to programming. It is related to programming since i'm using it and asking about libraries. What are the common types of communication protocols and their ...
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72 views

#include <stdatomic.h> generates compile errors with no code

Consider the following (non)code example: #include <stdatomic.h> void setup() { // Nowt. } void loop() { // Nowt squared. } This generates compile errors for several lines of code in ...
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1answer
67 views

is it necessary to include libraries that are specified in the header file already?

I am using the Adafruit BME280 library in my sketch. In the example sketches, they have included the Wire, SPI and the Adafruit_Sensor library. However, I see that in the Adafruit_BME280 library ...
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3answers
274 views

Programming Arduino Uno R3 to trigger a relay once every 24 hours

I programmed Arduino UNO R3 to trigger a relay once every 24 hours from the moment it is powered on I calculated milliseconds and used the function delay() 24 hours * 60 minutes each hour * 60 second ...
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224 views

How to use LCD display HD44780 with arduino without using any library

My professor wants me to implement a display to an old project prototype we had laying around on the lab. But he wants me NOT to use LiquidCrystal.h library or any other to achieve that. I read ...
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1answer
62 views

WebSocket Server for MKR1000

I was looking for a websocket server for my MKR100 but nothing I found looks it works. I tried all the libraries that come with arduino but half of those doesn't compile on MKR1000 and those that did ...
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25 views

Arduino and ZMPT101B But Not Stable Sigma Output In 7segment Display(TM1637) using filter library

#include <Arduino.h> #include <math.h> //TRUE RMS START #include <Filters.h> //Easy library to do the calculations #include <TM1637Display.h> float testFrequency = 100; ...
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1answer
250 views

Reading SNMP V2 OID from ESP8266/ESP32

i need to read from my ESP32/ESP8266 some SNMP V2 OID values from my home printer: it exists a library/method that can do that? I've seen some SNMP agents, but they works only with the devie as server ...
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1answer
478 views

Which Arduinos support ATOMIC_BLOCK?

Is there a definitive list of which Arduino architectures support the ATOMIC_BLOCK() macro, and a list of #defines for each architecture? I've tried searching through the Arduino cores on GitHub to ...
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1answer
88 views

AccelStepper library advanced codes!

I was trying to find out how this library can run multiple stepper motors at the same time, and I saw this important function called... void AccelStepper::setOutputPins(uint8_t mask) { uint8_t ...
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Arduino-Cli allow download libraries directly from GitHub?

I am creating some libraries that have other dependencies also created by me, and are not yet available for installation via the Arduino Library Manager, these libraries can be found for example at ...
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37 views

Is it possible to implement old AVR library onto arduino (specifically, NodeMCU esp8266)

I am a Computer Engineering Undergrad, currently in a cryptography(computer security) course, and I was assigned to do projects about implementing µNaCl library onto Arduino. I currently own a nodemcu ...
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44 views

Is it possible to access a RTC variable from outside a Lib [duplicate]

Inside my .cpp file of myESP32sleep library I have a few RTC_DATA_ATTR variables defined OUTSIDE esp32Sleep class ( this is the only way to define them ). How can I access bootCounter outside that ...
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92 views

ESP8266httpUpdate library built-in led blinking time

I have been working with the ESP8266httpUpdate library for a while now, I want to change the frequency of the blinking built-in led of the esp8266, I couldn't figure out how this library is commanding ...
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1answer
42 views

Teensy 2.0 MIDI: Number of notes in a chord limited to 6?

I am using the Teensy 2.0 with USBMidi in a project that allows musicians to use retro computers as "instruments" (https://github.com/fredlcore/midijoy). So far, all these computers had no more than ...
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75 views

Arduino Raspberry RadioHead node sends sensor data with sendtowait (ReliableDatagram) raspberry receives but node gets no ack

I have a configuration like following: An Arduino and a raspberry both running with RadioHead library Arduino with sensor sends data to a raspberry gateway using RHReliableDatagram with the sendtoWait ...
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1answer
63 views

Vibration pattern matching [closed]

I would like to generate vibration patterns using the SW-420 or something similar that is able to reproduce the same pattern on similar vibrations. So if a 10p coin was dropped on a table from 1m at a ...
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1answer
343 views

Error in defining Ticker in ESP32 library

I'm using the exact piece of code in my ESP8266 library (which works OK ), but when used in a ESP32 library- I got an error: This is the relevant code snip: void myIOT32::_feedTheDog() { ...
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1answer
68 views

Arduino Trinket and CCS811 sensor

I have connected trinket and CCS811 I am trying to build and upload sketch to the module: /****************************************************************************** Read basic CO2 and TVOCs ...
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1answer
57 views

ESP32 using PubSub, creating an error when implemted inside a library

I wish to combine into a single library Wifi + MQTT, for a multi devices project. right after boot, getting Wifi - I get an error the moment MQTT server is trying to connect: mqttClient.connect(...
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1answer
60 views

Matrix and State Space Arduino Implementation

I wrote an Arduino Matrix class. Then I used this class to implement State Space on Arduino. During tests I stomped upon a problem. After starting the program it stops at some point. I have no idea ...
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1answer
123 views

Use ISRs inside a library more elegantly

At the moment I try to make a library which uses attachInterrupt(?,?,RISING) to read a sensor. The article of Nick Gammon on Calling an ISR from a class helped me a lot, but his "Glue routines" get ...

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