The plan is to send a JSON string via serial or ethernet and the arduino parses the string (using the libary) and then acts approprately. I have figured out the parsing element, but I am havving some trouble with the serial aspect. The library requires the JSON string to be in a char*, but the serial read is a char. Convert a Text String Date to Date Serial Number In previous posts I’ve been going through some formulas designed to extract and convert a text string Date, to a Date serial number. Extract a Date from Text in Excel. VB.NET - Serial Key Generating (Encryption, Hashing, Encoding?) Algorithm. (An alpha-numeric key with numbers or letters in no particular pattern, preferably letter,number, letter or vice versa). Also, a routine that will convert ANY string into such a format (alpha-numeric, caps-only) will be acceptable.

1. Convert A String Into A Serial Key
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3. Convert A Sting Into A Serial Keys
4. Convert A String Into A Serial Key For Windows 10

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I'm using two Arduinos to sent plain text strings to each other using newsoftserial and an RF transceiver.

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.?

Peter MortensenJoeJoe

15 Answers

Peter Mortensenmagmamagmauser1415516user1415516

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 my stringn5 and the result would be str = 'my string' and x = 5

Piccolo

Convert A String Into A Serial Key

Ihab HajjIhab Hajj

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.

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:

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.

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.

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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

If you're using concatenate method then don't forget to trim the string if you're working with if else method.

Sandy

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.

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.

BengtBengt

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.

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.

Convert A Sting Into A Serial Key West

Commands:

• LED.ON
• LED.OFF

Note: Remember to change baud rate based on your board speed.

Convert A Sting Into A Serial Keys

ZunairZunair

Convert A String Into A Serial Key For Windows 10

protected by Community♦Jan 22 '17 at 19:13

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