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Questions tagged [debugging]

The process of finding and resolving problems ('bugs') in a hardware and/or software system.

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2 votes
1 answer
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Simulating a button press using the Serial Monitor to run a Servo

I'm kind of new to Arduino and C, and I was having trouble with this sketch. I'm working on a project to control 6 servos using virtual buttons. When I hold down the button, the servo moves forward ...
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0 votes
0 answers
33 views

Conflicting declaration using SHT40 sensor with arduino opla MKR carrier

I'm trying to use SHT40 this one with arduino opla kit, but I keep getting this error when compiling. In file included from /home/krystofprasil/Arduino/libraries/Arduino_MCHPTouch/src/...
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  • 305
2 votes
0 answers
29 views

How would I link inline debugger with esp32 on Mac?

I am trying to connect JTAG debugger to my esp32 according to the following steps https://www.instructables.com/How-to-Use-a-Debugger-on-an-ESP32/ but still I am facing issue in debugging. I am ...
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-1 votes
1 answer
36 views

'for loop' seems to change the execution of pow()

The first time, pow() works. But inside of a 'for loop', or again afterwards, it doesn't behave !? (I'm using a Chinese Pro Mini with Arduino 1.8.16) EDIT To clarify what I am asking, my question is:...
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  • 21
1 vote
0 answers
35 views

How to debug an error which occures after a long time only?

I've got an ESP32 with an CO2 sensor attached. The Arduino script I'm using is quite old and worked for sending them over LoraWAN to TTN and is stable. I added an Wifi-Client to read data more ...
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  • 111
4 votes
1 answer
48 views

Custom LED toggling function: one out of three LEDs misbehave

I connected three LEDs to an Arduino Uno and wrote a simple LED class. I toggle all the leds the main loop, but for some reason one led (connected to pin7) always misbehaves, skips one toggle or stays ...
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  • 73
1 vote
1 answer
166 views

Custom assert() implementation: not printing the error message

I am writing my own assert() macro on Arduino as shown below. When I run it from the main() it always works correctly (prints the message and gets into an infinite loop), however when I call it within ...
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  • 73
0 votes
1 answer
79 views

Serial communication of strings

I used this simple code to understand the basics of serial communication. This achieves simple communication between the computer and arduino: String receive_buffer; void setup() { Serial.begin(9600)...
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  • 149
1 vote
1 answer
768 views

Simple LCD countdown timer

I tried to modify the basic "hello-world" sketch for the LCD that is a part of the examples section in the IDE. I intended to make a countdown timer using the LCD. The original code simply ...
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  • 149
1 vote
0 answers
38 views

LED not lighting up despite digitalRead displaying 1

As part of a project, I created a simulation of a juncture with 4 traffic signals. The time for the green signal is set based on a function that calculates it based on an algorithm (and it takes the ...
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  • 149
0 votes
2 answers
78 views

Don't understand problem with my code

I'm trying to get a robot car(elegoo one) to do the obstacle avoidance course. I am trying to write my own one from scratch to better myself and thus would really appreciate it if someone were to tell ...
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3 votes
2 answers
939 views

How to get rid of low quality sound out from DFPlayer plus amplifier?

I use my Seeeduino V4, DFPlayer mini, and this speaker module from AliExpress to create an automatic doorbell. The problem is that it seems that this speaker module's Yurobot amplifier is not ...
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  • 153
3 votes
1 answer
4k views

Help solving "collect2.exe: error: ld returned 1 exit status" error in code

I just got an Elegoo UNO starter kit the other day and have been working my way through the little tutorials on all the parts it came with. I am using VSCode with Platform.io plugin and (after getting ...
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1 vote
1 answer
272 views

Onboard led HIGH and LOW seems reversed

On an ESP32 board I am trying this simple code to control the onboard led. But if I set it to HIGH, led is OFF, if I set it to LOW, led is ON (fully bright). What could cause this ? The board has one ...
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  • 242
2 votes
2 answers
726 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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1 vote
0 answers
432 views

Display GPS module data to my TFT display

I am using Arduino Mega 2560 and I have written code for my GPS module (Neo-6m-0-001/GY-NEO6MV2) and it is working fine independently. I also have written code for Compass module (QMC5883L) which is ...
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1 vote
0 answers
59 views

Need debug Software that can be used with Arduino IDE

Background: I have made a standalone Arduino board using Atmega328PB. I have written code for a clock which lights LEDs based on the time. After a day or so it locks up. Sometimes it reboots. I ...
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  • 41
2 votes
3 answers
899 views

How compile an Arduino program for a desktop PC

I have an arduino program that only does serial communications with a little bit of math, and I am writing another one to communicate with it on a second arduino. For testing purposes I was hoping I ...
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1 vote
0 answers
175 views

Lilygo TTGO T-Beam Guru Meditation Error

I have recently purchased a lilygo ttgo t-beam (868Mhz version) on which I try to run the "DeviceInfo" example code provided by TheThingsNetwork. When executing ttn.ShowStatus(); I see in ...
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  • 153
-1 votes
1 answer
97 views

Serial.print array displays nothing

I tried Serial.print an array I had made, but the Arduino displays nothing in the monitor. I tried doing Serial.print("Hehehe"); as a test, but it just displayed "h?h?h?". The monitor works fine ...
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1 vote
1 answer
138 views

Help with debugging code

This is NOT my code; was posted on Project Hub. I tried to use the code (humidity controller) but it returns an error on line 270: else if (DHT.humidity >= setpoint + 3 and syson == true) { //if ...
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15 votes
4 answers
7k views

My code seems to be a train wreck

I am new to programming and I thought a simple project to do would be to create an ammo counter. I have been troubleshooting this code for several hours now, and can not figure out why my code is ...
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  • 183
0 votes
2 answers
306 views

"expected primary-expression before '.' token" in debug code

I'm making some code for school, and is adding debug code to it. When compiling, I get the error as written in the title. This is the code in question: #define DEBUG 1 #ifdef DEBUG #define Serial....
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0 votes
1 answer
240 views

How to debug Arduino using Atmel studio?

I have an Arduino Yun board and an Atmel ICE programmer/debugger. There are 6 pins on the Arduino Yun to connect to Atmel ICE for programming only, but I can't find the pins for debugging. Anyway to ...
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1 vote
1 answer
568 views

ESP - Nodemcu amica - attachInterrupt crash program

I get new boards from the shop but they are little different from the previous version. I got software what works ok on Nodemcu lolin v3 now I get Nodemcu Amica what is almost same board but if I got ...
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1 vote
1 answer
73 views

Maximum Capacity Debugging

1. Example Check the program below for an Arduino Nano, Old Bootloader, for variable values of N. For low values (N<=1857), the program outputs "[FFFFFFFF]", For higher values (1858<=N<=...
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1 vote
0 answers
470 views

Arduino IDE - debugging Exception 29

I installed the ESP EXCEPTION DECODER along with my Arduino IDE. When my sketch crashes with Exception 29, I take the stack trace and input it, but I can't understand its line references (they dont ...
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  • 352
2 votes
2 answers
5k views

Proteus - How to Debug Invalid Opcode?

While running a program compiled in the Arduino IDE 1.8.5 and then using the .ELF file inside LabCenter Proteus 8.0, for an Arduino Nano ATMEL Mega 328P, for a code involving the use of the ...
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0 votes
1 answer
73 views

Weird problem with arduino

I wrote the code below and the result is not what I expected at all! I'm not sure why it's happening! void setup() { // put your setup code here, to run once: Serial.begin(9600); } const uint8_t ...
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  • 99
0 votes
1 answer
723 views

Debugging a Nordic MCU (feather NRF52) using Segger J-Link

I have an Afafruit NRF52 board with SD 132 and 5.1 dual fw bootloader. I implemented RTT logging and controlling (input) and the code is compiled using arduinoBuilder with RTT and debug level 3. The ...
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2 votes
1 answer
93 views

Debug-logging without using Serial.print and without WiFi

In order to transmit text from the Arduino board to the HC-05 Bluetooth module, I have use Serial.print. However, I don't see a way to debug the code without using Serial.print to test the other ...
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2 votes
1 answer
3k views

Using Serial Plotter with Visual Studio Code

I'm using the Visual Studio Code extension to develop for Arduino which works great. It doesn't have a Serial Plotter like the regular Arduino IDE, which I need to debug this project. I can run the ...
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0 votes
2 answers
103 views

For loop broken? [closed]

This is a pseudo code from my LED cube project void loop(){ //switch( map(constrain(analogRead(pt),10,1020),10,1020,1,4)); - for select pattern //show(1); for(lp=128;lp>=1;lp = lp/2){ ...
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  • 147
1 vote
3 answers
6k views

error: expected primary-expression before '(' token

I have a decent level of programming skill, or at least I thought so. I've been getting an error when compiling this Ardulno sketch. I don't really know what this error means or how to fix it. What's ...
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0 votes
1 answer
51 views

don't save on tab

Ok, I made some changes to the code and I wish they would see it. At the moment the program has a bug, it is not saving the contents of the txt file to the table, can someone give some lights? #...
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2 votes
2 answers
418 views

VisualMicro Can't compile in debug ('Serial' was not declared in this scope) for attiny84a

I was working on a project build initialy from the Arduino IDE to program an attiny84a (without a bootloader) using the board from https://github.com/damellis/attiny I got an atmel-ice recently and I ...
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-1 votes
2 answers
4k views

Counting number of people inside a room [closed]

I want to count the number of people in a room using a microcontroller (Arduino Uno). I have 2 ultrasonic sensors at a doorway about a 1.5m apart from each other. I want to increment the number when ...
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  • 11
0 votes
2 answers
749 views

How to use #define in a library I'm trying to write?

I have written simple code to enable toggling of serial.print debug data. #define DEBUG #ifdef DEBUG #define DEBUG3(x,y,z) Serial.print(x);Serial.print(" ");Serial.print(y); Serial....
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  • 33
1 vote
0 answers
197 views

HMC5883L stops reading when x-axis value get to positive value

I've been looking for a solution for this problem for quite a time I tried different I2C libraries; like, I2C master library using hardware TWI interface * Author: Peter Fleury But the same ...
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  • 183
-1 votes
1 answer
59 views

Serial speed for debugging/logging

I have a sketch where I want to check my nRF24L01's and they work great. However, due to Serial.print(ln) statements I noticed there is a lot of delay. Is this normal? I mean, is it better not to ...
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1 vote
1 answer
214 views

Controllino Debugging

Its a well known fact, that you can debug your arduino board with the help of an Atmel Ice. However, you might know the Controllino which is an arduino compatible device. It has an ATmega2560 on it. ...
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  • 113
1 vote
2 answers
402 views

How to programmatically choose "board model" and "port number" in Arduino IDE?

I'm testing three different Arduino (nano, Uno and Mega) each of them having a nRF module. The codes (sketches) are different for each module. I've connected the arduinos to my single laptop via 3 USB ...
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1 vote
2 answers
3k views

Multiple MFRC522 RFID reader on Uno bugs

I have a problem! I need to connect 5 MFRC522 readers on an Arduino Uno but it is not working ! With one or two MFRC522 modules it works, when I use three or more nothing works anymore... The serial ...
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1 vote
1 answer
1k views

Temperature sensor bugs

My project is based on a moving fan using DHT11 sensors. I have used 2 void loops and the IDE is showing an error "exit status 1 redefinition of 'void loop()'" One doubt: Can we use 2 void loops ...
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1 vote
1 answer
518 views

47Effects MIDI Library and serial debugging

I noticed that since I use the MIDI library from 47effects, I cannot use the print(ln) for the serial port for debugging purposes, neither I can find it in the documentation. It states that the MIDI ...
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2 votes
1 answer
48 views

From Exploring Arduino Text

I am working thru the Exploring Arduino text mostly with success up until chapter 4. I have most of the parts required but for Figure 4-3 I used the following: 100nF Capacitor, (In place of 1uF ...
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1 vote
1 answer
596 views

Why does static member std::map reset ESP8266 when outside the .ino file?

Here's an example of a class which crashes the ESP8266-03 causing it to reset: Test.hpp file: #include <map> class Test { public: int data() const; Test(int x); ~Test(); ...
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  • 13
1 vote
1 answer
1k views

`servo.attach()` paralyzing (one) motor on L298N

I have 2 DC motors (well, 4; but each pair is controlled by the same "signals") connected via a L298N, which is connected to the Arduino. In addition, I have a servo motor connected to the Arduino. ...
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  • 189
9 votes
4 answers
14k views

How to use breakpoints for debugging

Breakpoints are a great way to see how the compiler runs to your code. Now my question is, is there a possibility to use breakpoints when you debug your code?
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0 votes
1 answer
204 views

SPI Overflow in 328 slave with i2c sensor

I am working on creating sensor poller that is going to be polling multiple sensors and then, on request, provides its data to the master. The master polls the slave (SPI) at 50hz and the slave is ...
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