Questions tagged [constants]

Question 1

I have to measure the pH value for some experiment. I have checked various codes and all include the average of pH values. #define SensorPin 0 // the pH meter Analog output is connected with ...

Question 2

For example constant of MSBFIRST, It used to as input in SPI.setBitOrder(MSBFIRST). But sadly i don't know the type data of MSBFIRST. This is applied to like SPI_MODE0 and other.

Question 3

I'm declaring an array at top level like so: constexpr byte a[] = { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, }; // whatever data I'm referencing the array in such a way that it's not optimized away. When ...

Question 4

I'm kind of new in the Arduino world. I decided to make a self learning project with an Arduino where it controls a conveyor that simply moves from right to left and back again. There is a start and ...

Question 5

Good day! How to set sensor Data parameters? Like the data only set for example it starts with minimum value of 3 and ends with maximum value of 6 and it will turn on led 1 and if minimum value of 1 ...

Question 6

When creating an array like in the sketch #include <Lib.h> int myArray[Lib::len]; void setup() {} void loop() {} the variable len must be an integer constant that is known at compile time. ...

Question 7

I see a lot of people, but also libraries, defining constants (like pin numbers, length of items etc) as #define: #define LENGTH 5 While it is recommended to use in this case static const int: ...

Question 8

In an ISR I want to keep things quick. At the same time I want to limit variable scope. Storage space is not a factor. I have this line: const char trigs[] = "aAbBcCdDeEfFgGhHiIjJ"; When this is ...

Question 9

I was trying to compile some Arduino code on the PC for testing when I noticed some strange syntax for numerical binary constants. Convetion seems to be to declare them like so: static const ...

Question 10

I'm working on a project for the arduino uno for which I need multiple constant arrays of bytes. Such an array is initialized like so: const byte charR[] PROGMEM = { B01111111,//top half ...

Question 11

A newbie in Arduino- and I'm trying to concatenate string and chars ( well in python it is quite different ). I'm trying to post a MQTT message- constructed following format to the client.publish(...

Question 12

Preamble: I am trying to figure out how to program and use the timers in the Feather M0 using the Arduino IDE. I have seen a number of examples published, but I'm not one to just blindly copy some ...

Question 13

I'm working on a project where I need to create a JSON to send back state of an object. I created the code to achieve it and all works fine, but I used this to declare the JSON fields: static const ...

Question 14

Why I'm getting this error? invalid conversion from 'const char*' to 'char' [-fpermissive] Here is my simple sketch: const char data = "should"; //I have also tried: //const char* data = "should"; ...

Question 15

In my sketch I have the following: #define HU_ADDR 0x190; #define ALL_AUDIO_ADDR 0x1FF; #define MY_ADDR 0x360; #define UNKNOWN_ADDR 0xFFF; typedef ...

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Questions tagged [constants]

Code explanation when pH sensor is connected to Arduino

How to know the data type of constant in arduino IDE?

Can data be stored in program storage space instead of dynamic memory?

Increase or decrease const byte value inside the code with a push button

How to Set Sensor Data Parameters?

Creating an array with the length coming from a library

#define above static const int?

Optimizing for speed using const, static, constexpr etc in a function

Syntax of binary Constants

Initialize and read from a PROGMEM array of pointers to PROGMEM arrays

String & Char concatenations

How to determine the source of constants in libraries?

Best practice to declare a 'static' text and save memory

Why I'm getting this error: invalid conversion from 'const char*' to 'char' [-fpermissive]?

Constants within array of structs causes strange compiler errors?

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