These Arduino projects are designed to display the value of inputs using the serial monitor. Serial is a method of communication between a peripheral and a computer. In this case, it is serial communication over Universal Serial Bus (USB). When reading sensors with an Arduino, the values are sent.
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Say I have some variables that I want to print out to the terminal, what's the easiest way to print them in a string?
Currently I do something like this:
Is there a better way to do this?
sachleensachleen
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11 Answersardprintf is a function that I hacked together which simulates printf over the serial connection. This function (given at the bottom) can be pasted in the beginning of the files where the function is needed. It should not create any conflicts.
It can be called similar to
printf . See it in action in this example:
The output as expected is:
The function prototype is:
It returns the number of arguments detected in the function call.
This is the function definition:
**To print the
% character, use %% .*
Now, available on Github gists.
asheeshrasheeshr
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I wouldn't normally put two answers to a question, but I only just found this today, where you can use printf without any buffer.
This still has the floating point limitation.
edit: I thought I would do a little testing on this, and it works quite well. I added a better test to the loop with formatted output.
MadivadMadivad
This is probably not better, just different.You can use the String object for output. These objects allow concatenation and support automatic typecasting.
Klaus-Dieter WarzechaKlaus-Dieter Warzecha
I usually used Tabs to make things line up better in the Serial. Having things line up like I do allow the arduino to fire as fast as possible while being able to notice certain changes in the variables.
Try something like this:
Or something like this:
Steven10172Steven10172
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linhartr22linhartr22
I am newbie in Arduino world, but I recently found that this is just a regular C++ (without exceptions and probably polymorphism). But you still can enjoy templates. So my solution is to use following templates:
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Nice thing here is that it does not use any extra memory and extra processing here.
user270049user270049
I usually (painfully) stick with multiple lines of
Serial.print but when it becomes convoluted I go back to sprintf . It's annoying in that you have to have an available buffer for it.
Usage is as simple (??) as:
A word of warning though, it doesn't (by default) support floating types.
MadivadMadivad
Using
Streaming.h , in place of
one can write
The definition of
<< in Streaming.h in effect translates that into a series of ordinary Serial.print() calls. That is, << is syntactic sugar, implemented without increasing code size.
If you don't have
Streaming.h installed, get Streaming5.zip from arduiniana.org. Unzip it in your libraries directory, for example in ~/sketchbook/libraries . Add the line #include <Streaming.h> within sketches where you use << as a stream operator.
Base-conversion specifiers _HEX, _DEC, _OCT, and _BIN are provided, as well as a _FLOAT function (with number of decimal places) and
endl . For example, to print latitude and longitude values in a form like 'Your coordinates are -23.123, 135.4567” one could write:
This could also be written as
which would keep the longer string in PROGMEM instead of bringing it into RAM.
Note, James Waldby - jwpat7James Waldby - jwpat7
Streaming.h doesn't build any strings as such; it just delivers the text of its << -arguments to a stream. A PString class at arduiniana can build strings from stream inputs, if strings instead of streamed output are desired or needed.
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The usage will depend of the data type of your variables.
If they are
int , it would be %d or %i If they are string , it would be %s
Arduino Serial Print Examples For Free
Wrapper for printf
You can change the limit based on your requirements
Source: https://playground.arduino.cc/Main/Printf
Usage examples:
ESP8266
Its built-in in
Serial Stig severinsen breatheology pdf 2017. class of the framework. No need for additional library or function.
More details about formatting tips on the printf format reference page : http://www.cplusplus.com/reference/cstdio/printf/
n is the escape sequence for the line feed.
Escape sequences are used to represent certain special characters within string literals and character literals.
Source: http://en.cppreference.com/w/cpp/language/escape
Arduino Serial Monitor
[EDIT]- As @Juraj mentioned, it's not available on most of the AVR modules. So I added ESP8266 mention and a printf wrapper for common AVR modules
RemiRemi
Arduino Serial Print Examples For Beginners
From http://playground.arduino.cc/Main/PrintfI observed this is working fine on my mega2560
That's all it just worked, no need for vsnprintf_P or PROGMEM ..
rzrrzr
gre_gor
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Michael KushnerMichael Kushner
Arduino Serial Output ExampleNot the answer you're looking for? Browse other questions tagged serialstringterminal or ask your own question.Comments are closed.
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