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- Write To Serial Monitor Arduino
- Arduino User Input From Serial Monitor
- Arduino Read Text From Serial Monitor
- Arduino Input From Serial Monitor
- Arduino Read Integer From Serial Monitor
I'm using two Arduinos to sent plain text strings to each other using newsoftserial and an RF transceiver.
This starts serial communication, so that the Arduino can send out commands through the USB connection. The value 9600 is called the 'baud rate' of the connection. This is how fast the data is to be sent. You can change this to a higher value, but you will also have to change the Arduio Serial monitor.
Each string is perhaps 20-30 characters in length. How do I convert
Peter MortensenSerial.read()
into a string so I can do if x 'testing statements'
, etc.?14.5k1919 gold badges8989 silver badges118118 bronze badges
JoeWrite To Serial Monitor Arduino
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15 Answers
Peter Mortensen
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magmamagma7,60411 gold badge3030 silver badges3232 bronze badges
user1415516user14155161,13211 gold badge77 silver badges33 bronze badges
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
Piccolomy stringn5
and the result would be str = 'my string'
and x = 5
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Ihab HajjIhab Hajj1,54211 gold badge1515 silver badges3131 bronze badges
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
Arduino User Input From Serial Monitor
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 detects unusually long input values and safely discards them. For example, if the source had an error and generated input without the expected terminator; or was malicious.
- It ensures the string value is always null terminated (even when buffer size is completely filled).
- It waits until the complete value is captured. For example, transmission delays could cause Serial.available() to return zero before the rest of the value finishes arriving.
- Does not skip values when multiple values arrive quicker than they can be processed (subject to the limitations of the serial input buffer).
- Can handle values that are a prefix of another value (e.g. 'abc' and 'abcd' can both be read in).
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:
HoylenHoylen11.2k44 gold badges2626 silver badges1313 bronze badges
flamaniacflamaniac
If you're using concatenate method then don't forget to trim the string if you're working with if else method.
Sandy3,29444 gold badges3636 silver badges6161 bronze badges
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
BengtBengt10.4k55 gold badges3939 silver badges6161 bronze badges
Many great answers, here is my 2 cents with exact functionality as requested in the question.
Arduino Read Text From Serial Monitor
Plus it should be a bit easier to read and debug.
Code is tested up to 128 chars of input.
Tested on Arduino uno r3 (Arduino IDE 1.6.8)
Functionality:
- Turns Arduino onboard led (pin 13) on or off using serial command input.
Commands:
- LED.ON
- LED.OFF
Arduino Input From Serial Monitor
Note: Remember to change baud rate based on your board speed.
Arduino Read Integer From Serial Monitor
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TheJonaMrTheJonaMr
protected by Community♦Jan 22 '17 at 19:13
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