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.
1,680 questions
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How can I handle the millis() rollover?
I need to read a sensor every five minutes, but since my sketch also has
other tasks to do, I cannot just delay() between the readings. There
is the Blink without
delay tutorial
suggesting I code ...
- 45.2k
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votes
22
answers
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What are the other IDEs for Arduino?
The basic Arduino IDE lacks a lot of the sophistication present in other IDEs such as code completion, code collapsing, folder organisation, etc. Are there other IDEs that allow programming in C or C++...
- 1,149
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Is using malloc() and free() a really bad idea on Arduino?
The use of malloc() and free() seems pretty rare in the Arduino world. It is used in pure AVR C much more often, but still with caution.
Is it a really bad idea to use malloc() and free() with ...
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Arduino Nano uploading gives error: avrdude: stk500_recv(): programmer is not responding
I have a Arduino Nano (Sainsmart) that I'm trying to upload a sketch to. Under the Arduino IDE, the device selected was Arduino Nano w/ ATmega328.
However uploading the sketch gives me the error
...
- 1,419
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Programming an Arduino using Python, rather than C/C++
I am not very skilled with the C Language and I was wondering if there is a way in which python could be used to program an Arduino. This would most likely require a different IDE in order to be able ...
- 1,903
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Is it better to use #define or const int for constants?
Arduino is an odd hybrid, where some C++ functionality is used in the embedded world—traditionally a C environment. Indeed, a lot of Arduino code is very C like though.
C has traditionally used #...
- 5,430
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votes
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Asynchronous function calls in Arduino sketch
In an Arduino sketch, is there a way to make asynchronous function calls within the loop? Like listening to requests through http server and process them in a non-blocking way.
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Why can't I declare a class in another tab in Arduino IDE?
I wanted to move some of my code out into a second tab in the Arduino IDE, to keep things better organised. At first, I only tried moving a function, and it seemed to work fine. I could call the ...
- 11k
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votes
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answers
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What overheads and other considerations are there when using a struct vs a class?
C on embedded systems has traditionally use structs to hold structured data.
Arduino brings C++ to the table, so we can use classes instead.
Lets say we have two different data structures which ...
- 5,430
22
votes
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answers
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How much can I recurse? How much can I recurse? How much ca!@#QFSD@$RFW
The Arduino Uno board has limited RAM which means it has a limited call stack available. Sometimes, recursion is the only quick option to implement a certain algorithm. So, given that the call stack ...
- 3,847
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Classes and objects: how many and which file types do I actually need to use them?
I have no previous experience with C++ or C, but know how to program C# and am learning Arduino. I just want to organize my sketches and am quite comfortable with the Arduino language even with its ...
- 503
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2
answers
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Would an infinite loop inside loop() perform faster?
When you're writing a typical sketch, you usually rely on loop() being called repeatedly for as long as the Arduino is running. Moving in and out of the loop() function must introduce a small overhead ...
- 11k
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votes
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answers
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deprecated conversion from string constant to 'char*'
What does this error means?
I can't solve it in any way.
warning: deprecated conversion from string constant to 'char*' [-Wwrite-strings]
- 439
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How can I declare an array of variable size (Globally)
I'd like to make three arrays of the same length. According to the documentation, Arrays must be defined as int myArray[10]; where 10 can be substituted for a known length (another integer), or filled ...
- 293
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What is the best way to unit test my code without controller? [duplicate]
I want to unit test my Arduino code. Ideally, I want to execute and test my code without uploading it to the board. What tools or libraries can help me with this?
There is an Arduino emulator in ...
- 1,407