// Example 5 - Receive with start- and end-markers combined with parsing const byte numChars = 32; char receivedChars[numChars]; char tempChars[numChars]; // temporary array for use when parsing // variables to hold the parsed data char messageFromPC[numChars] = {0}; int integerFromPC = 0; float floatFromPC = 0.0; boolean newData = false; //============ void setup() { Serial.begin(9600); Serial.println("This demo expects 3 pieces of data - text, an integer and a floating point value"); Serial.println("Enter data in this style "); Serial.println(); } //============ void loop() { recvWithStartEndMarkers(); if (newData == true) { strcpy(tempChars, receivedChars); // this temporary copy is necessary to protect the original data // because strtok() used in parseData() replaces the commas with \0 parseData(); showParsedData(); newData = false; } } //============ void recvWithStartEndMarkers() { static boolean recvInProgress = false; static byte ndx = 0; char startMarker = ' '; char rc; while (Serial.available() > 0 && newData == false) { rc = Serial.read(); if (recvInProgress == true) { if (rc != endMarker) { receivedChars[ndx] = rc; ndx++; if (ndx >= numChars) { ndx = numChars - 1; } } else { receivedChars[ndx] = '\0'; // terminate the string recvInProgress = false; ndx = 0; newData = true; } } else if (rc == startMarker) { recvInProgress = true; } } } //============ void parseData() { // split the data into its parts char * strtokIndx; // this is used by strtok() as an index strtokIndx = strtok(tempChars,","); // get the first part - the string strcpy(messageFromPC, strtokIndx); // copy it to messageFromPC strtokIndx = strtok(NULL, ","); // this continues where the previous call left off integerFromPC = atoi(strtokIndx); // convert this part to an integer strtokIndx = strtok(NULL, ","); floatFromPC = atof(strtokIndx); // convert this part to a float } //============ void showParsedData() { Serial.print("Message "); Serial.println(messageFromPC); Serial.print("Integer "); Serial.println(integerFromPC); Serial.print("Float "); Serial.println(floatFromPC); } Original Code from here I am trying to communicate my Arduino with ESP32. Now the last part left is to make the values obtained in Arduino send over to ESP32 and make the values a variable so they can be read by Arduino IoT Cloud. I searched for solutions. However, the best solution is what I found on this thread, which then led me to the code above. I am a beginner, so I am very sorry for my incompetence. Thank you!

Thank you everyone for the help! I found the solution that I wanted it is from this site. The code for breaking up a single string into different variables are as follows: if(Serial.available()){ String rxString = ""; String strArr[2]; //Set the size of the array to equal the number of values you will be receiveing. //Keep looping until there is something in the buffer. while (Serial.available()) { //Delay to allow byte to arrive in input buffer. delay(2); //Read a single character from the buffer. char ch = Serial.read(); //Append that single character to a string. rxString+= ch; } int stringStart = 0; int arrayIndex = 0; for (int i=0; i < rxString.length(); i++){ //Get character and check if it's our "special" character. if(rxString.charAt(i) == ','){ //Clear previous values from array. strArr[arrayIndex] = ""; //Save substring into array. strArr[arrayIndex] = rxString.substring(stringStart, i); //Set new string starting point. stringStart = (i+1); arrayIndex++; } } //Put values from the array into the variables. String value1 = strArr[0]; String value2 = strArr[1]; //Convert string to int if you need it. int intValue1 = value1.toInt(); } I studied and changed the code to like this: String value1,value2,value3,value4,value5; char ch; int aqi,co; float temp,hum; if(Serial2.available()){ String rxString = ""; String strArr[4]; //Set the size of the array to equal the number of values you will be receiveing. //Keep looping until there is something in the buffer. while (Serial2.available()) { //Delay to allow byte to arrive in input buffer. delay(2); //Read a single character from the buffer. ch = Serial2.read(); //Append that single character to a string. rxString+= ch; } int stringStart = 0; int arrayIndex = 0; for (int i=0; i < rxString.length(); i++){ //Get character and check if it's our "special" character. if(rxString.charAt(i) == ','){ //Clear previous values from array. strArr[arrayIndex] = ""; //Save substring into array. strArr[arrayIndex] = rxString.substring(stringStart, i); //Set new string starting point. stringStart = (i+1); arrayIndex++; } } //Put values from the array into the variables. value1 = strArr[0]; value2 = strArr[1]; value3 = strArr[2]; value4 = strArr[3]; value5 = strArr[4]; //Convert string to int if you need it. aqi = value1.toInt(); co = value2.toInt(); temp = value3.toFloat(); hum = value4.toFloat(); I am still a bit new to this. The solution provided by gcjr and J-M-L doesnt seem to work for me. Moreover, I am not familiar with the code, I dont even know like 80% of the code even does lol. Therefore, I found the next solution. I think that this solution is better for begineers like me and the code is easier to understand, I manged to tweak them by myself. Anyways I hope it helps other people in the future! I am not a native English speaker, hopefully you guys can understand my english. Thank you very much!

talk to @errols ... [image] How does one split a string into more than only 2 values Programming Questions Hi would like to continue with a topic that i see that has not really being answered. I have come to the same problem i want to split the String in the for loop. I do see that other method has being promoted in the above link, like using the char *ptr = strtok(str, delim); But that i would not know how to implement it , as this line of code i'm using now seems to work for me for the two substrings. But how ever this is were i would like to know, what would i add to the last three substrings… if you are sure you are receiving 3 data, just add one strtokIndx = strtok(NULL, ","); and use something like integerFromPC = atoi(strtokIndx); // convert this part to an integer to extract the data

You mean 3 integers instead of 1 string, 1 integer and 1 float? If so, I think the code you have found was purposely written to provide examples of each of those 3 kinds of values. It currently reads the message to extract an integer, you just need to do that 3 times. But if you are a beginner, this is not the best way to start. It's too complex and confusing. Start with simple tutorials that flash LEDs etc. You need to understand the basics of programming in C before tackling something like this.

consider char s [80]; #define MaxTok 10 char *toks [MaxTok]; int vals [MaxTok]; // ----------------------------------------------------------------------------- int tokenize ( char *s, const char *sep ) { unsigned n = 0; toks [n] = strtok (s, sep); vals [n] = atoi (toks [n]); for (n = 1; (toks [n] = strtok (NULL, sep)); n++) vals [n] = atoi (toks [n]); return n; } // ----------------------------------------------------------------------------- void dispToks ( char * toks []) { char s [40]; for (unsigned n = 0; toks [n]; n++) { sprintf (s, " %6d %s", vals [n], toks [n]); Serial.println (s); } } // ----------------------------------------------------------------------------- void loop () { if (Serial.available ()) { int n = Serial. readBytesUntil ('\n', s, sizeof(s)-1); s [n] = 0; // terminate string tokenize (s, ","); dispToks (toks); } } // ----------------------------------------------------------------------------- void setup () { Serial.begin (9600); }

Anyone knows how to change this to work with 3 integers instead?

Projects Programming

J-M-L October 2, 2022, 8:53am 2

talk to @errols ...

if you are sure you are receiving 3 data, just add one
strtokIndx = strtok(NULL, ",");

and use something like

    integerFromPC = atoi(strtokIndx);     // convert this part to an integer

to extract the data

Topic		Replies	Views
How does one split a string into more than only 2 values Programming	19	1376	October 23, 2022
CSV to array with strtok() Programming	42	685	September 4, 2026
How to use substring properly Programming	9	1031	June 13, 2024
Splitting a String into multiple Integer Programming	4	16063	March 10, 2015
Splitting string to int with ESP serial communication Programming	12	2631	May 9, 2021

Anyone knows how to change this to work with 3 integers instead?

Related topics