I'm using two Arduinos to sent plain text strings to each other using newsoftserial and an RF transceiver.
Active2 years, 8 months ago
Each string is perhaps 20-30 characters in length. How do I convert
Serial.read() into a string so I can do if x 'testing statements' , etc.?
Serial monitor of Arduino is a very useful feature.Serial monitor is used to see receive data, send data,print data and so on.Serial monitor is connected to the Arduino through serial communication. This serial communication occurs using RX (pin 0) and TX (pin 1) terminal of Arduino. Any kind of data can send through this serial monitor. The Arduino Reference text is licensed under a Creative Commons Attribution-Share Alike 3.0 License. Find anything that can be improved? Serial: serial port object. See the list of available serial ports for each board on the Serial main page.
Peter Mortensen
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JoeJoe
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15 AnswersPeter Mortensen
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You can use
Serial.readString() and Serial.readStringUntil() to parse strings from Serial on the Arduino.
You can also use
Serial.parseInt() to read integer values from serial.
The value to send over serial would be Piccolo
my stringn5 and the result would be str = 'my string' and x = 5
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Ihab HajjIhab Hajj
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I was asking the same question myself and after some research I found something like that.
It works like a charm for me. I use it to remote control my Arduino.
ladislasladislas
mrvmrv
The best and most intuitive way is to use serialEvent() callback Arduino defines along with loop() and setup().
I've built a small library a while back that handles message reception, but never had time to opensource it.This library receives n terminated lines that represent a command and arbitrary payload, space-separated.You can tweak it to use your own protocol easily.
First of all, a library, SerialReciever.h:
To use it, in your project do this:
To use the received commands:
BlazerBlazer
If you want to read messages from the serial port and you need to deal with every single message separately I suggest separating messages into parts using a separator like this:
This way you will get a single message every time you use the function.
QurashiQurashi
Here is a more robust implementation that handles abnormal input and race conditions.
It deliberately uses character arrays instead of the
String type, to be more efficient and to avoid memory problems. It also avoids using the readStringUntil() function, to not timeout before the input arrives.
The original question did not say how the variable length strings are defined, but I'll assume they are terminated by a single newline character - which turns this into a line reading problem.
Here is an example of it being used to read commands from the serial monitor:
HoylenHoylen
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flamaniacflamaniac
If you're using concatenate method then don't forget to trim the string if you're working with if else method.
Sandy
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user3528736user3528736
Use string append operator on the serial.read(). It works better than string.concat()
After you are done saving the stream in a string(mystring, in this case), use SubString functions to extract what you are looking for.
SaroshSarosh
Credit for this goes to magma. Great answer, but here it is using c++ style strings instead of c style strings. Some users may find that easier.
j_v_wow_dj_v_wow_d
Serial Input ArduinoBengtBengt
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Many great answers, here is my 2 cents with exact functionality as requested in the question.
Plus it should be a bit easier to read and debug.
Arduino Serial Input Basics
Code is tested up to 128 chars of input.
Tested on Arduino uno r3 (Arduino IDE 1.6.8)
Functionality:
Commands:
Note: Remember to change baud rate based on your board speed.
ZunairZunair
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TheJonaMrTheJonaMr
protected by Community♦Jan 22 '17 at 19:13
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