how do I get a string from the com port and check it ? #include // connect the library int val =12345; // the variable is equal to five characters 12345 String stringOne, stringTwo; // declaration of 2 lines, to address in any part of the code??? void setup(){ Serial.begin(9600); // enable port monitor, set speed } void loop() { char buff[5]; // char = int val itoa(val, buff, DEC); // char = int val unsigned char* hash=MD5::make_hash(buff); // hashing 12345 char *md5str = MD5::make_digest(hash, 16); // hashing 12345 free(hash); // hashing 12345 Serial.println(md5str); // we print the hash 12345 it is equal to = 827ccb0eea8a706c4c34a16891f84e7b stringTwo = Serial.readString(); // stringTwo must be equal to "827ccb0eea8a706c4c34a16891f84e7b" Serial.println(stringTwo); // for tracking, you can specify stringTwo = "827ccb0eea8a706c4c34a16891f84e7b"; that's how it works, but you need to read from the port stringOne = "827ccb0eea8a706c4c34a16891f84e7b"; // line 1 == hash that is needed if (stringOne == stringTwo) { // compare hashes 1 and 2, and if there are matches // ANALOG if (stringOne.equals(stringTwo)) { Serial.println(stringOne + " == " + stringTwo); } // print there is a match }

See Serial input basics - updated

Another serial overview: Arduino Tutorial - Lesson 4 - Serial communication and playing with data (ladyada.net) With the Arduino standard core, one typically acquire serial data one-character-at-a-time. Characters can be assembled into Strings or strings. Some of my old stuff: Don't Cross The Streams (FP scientific calculator serial co-processor) - Community / Exhibition / Gallery - Arduino Forum The QBF - "The Quick Brown Fox..." For Serial Diags - Community / Exhibition / Gallery - Arduino Forum

You’re very. rave expecting members to jump to an unascribed anonymous link… Better to post what you have to show, or at the very least state what the link is. Most of the competent helpers simply won’t look at a link like that.

I do not see an answer there, I tried to rewrite this code many times as indicated in the lessons, but there is no result, this part of the code does not work, stringtwo = Serial.ReadString(); it works stringTwo = "827ccb0eea8a706c4c34a16891f84e7b"; but you need not specify, but read from the com port

first of all post your latest complete sketch. The complete sketch. It doesn't matter if the sketch is 2000 lines long. You can add some hints where you assume where the problem might be. You can post code by using this method that adds the code-tags just three steps press Ctrl-T for autoformatting your code do a rightclick with the mouse and choose "copy for forum" paste clipboard into write-window of a posting If your code does not work there are two ways to analyse the problem: adding a second serial interface and listening to serial-debug-output with an USB-to-TTL-adapter. If you just send you could use the standard serial monitor to send and receive the serial debug-output going up from a small testprogram that simply sends a few characters and print the received characters to the serial-monitor and working up to the complete complexity from there best regards Stefan

Using the String class can cause hard to diagnose memory problems. See the evils of Strings. The readString() function is blocking which can make your code less responsive. Using the methods in Robin2's serial input basics tutorial (linked by @UKHeliBob) will avoid both of those problems.

There is another library that can do non-blocking-receiving of strings / characters. And here is a link to a short tutorial that has an example-code [image] Non-blocking receiving of commands over serial interface using the SafeString-library [code example] Introductory Tutorials This is another small tutorial that shall demonstrate how to receive commands over a serial interface in a non-blocking manner using the SafeString-library If you are in a hurry to throw together code as fast as possible jump to posting # 2 non-blocking means the code has a fast running function loop() that is able to check for button-presses check for IO-pin changing their state read in sensors etc and in parallel listen to the serial interface all the time and in case all characters of a…

thank you, you should probably give up string comparison or compare every character, which is inconvenient... and the speed will decrease .. but there is probably no other way

hm user 3f_x is the thread-opener and gives himself the advice [image] 3f_x: you should probably give up string comparison or compare every character, which is inconvenient... and the speed will decrease .. but there is probably no other way To me this seems a little bit strange.... hm what could be the reason ......

these are not tips, these are my thoughts #include int val =12345; char target[] = "827ccb0eea8a706c4c34a16891f84e7b"; void setup(){ Serial.begin(9600); } void loop() { if (Serial.find(target)) Serial.println("found"); char buff[5]; itoa(val, buff, DEC); delay(1000); unsigned char* hash=MD5::make_hash(buff); char *md5str = MD5::make_digest(hash, 16); free(hash); Serial.println(md5str); // 827ccb0eea8a706c4c34a16891f84e7b free(md5str); delay(1000); if (Serial.print(target)) { Serial.println("found"); } } probably the best option of all that I have tried, but unfortunately it prints the hash twice, if you have other options, please show the code, prove the code

How do I get a string from the com port and check it?

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StefanL38 June 20, 2022, 3:19pm 8

There is another library that can do non-blocking-receiving of strings / characters.
And here is a link to a short tutorial that has an example-code

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How do I get a string from the com port and check it?

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