Questions tagged [string]
A sequence of characters -- including letters, numbers and symbols -- often used for representing information in a human-readable format.
307
questions
0
votes
1
answer
43
views
String Comparison [closed]
I am trying to compare two string but each time i am getting awkward results. When i use Equals() function i always get the wrong answer and never satisfy the IF statement. When i use compareTo() ...
- 9
1
vote
1
answer
575
views
Conversion from ASCII uint8_t to string
I am sending a string from a Raspberry Pi to an ESP32 via BT. I am getting one ASCII value per line. How to convert it into one whole String? I tried as follows, but I get an error while running the ...
- 11
2
votes
2
answers
35
views
How do I fix my code so that it reads text from the serial monitor?
I have created a code that should print out "Enter true to deactivate alarm" in the serial monitor, then store the user's answer and print "alarm off" if they enter true and "...
- 21
0
votes
3
answers
101
views
String type replace function can't replace with no char
I want to replace the ":"(colon) in the MAC address with no char (remove the ":").
But I can't find any good solution.
String.replace(), can't replace with (void).
Note: String....
- 25
2
votes
2
answers
59
views
Read & Write to EEPROM
I need to implement EEPROM Read & Write functionality to my project.
I've been learning how to use the EEPROM on the last few days, however I'm struggling to Read & Write Strings to EEPROM.
...
user70243
0
votes
1
answer
53
views
Optimised random alphanumeric string generator
I'm trying to build arduino nonce generator, but the only thing I found is this question on arduino forum but I can't find out how to make it work for me. I checked and Serial.available() is always 0 ...
- 305
1
vote
1
answer
233
views
What's is the best way to convert std::string to String?
Pardon me, I am a novice programmer. I was trying to use the toInt() function for a std::string but I noticed that toInt() only works for the String class. So, I have an std::string sliderValue and ...
- 13
0
votes
1
answer
100
views
String Split Issue
I am getting multiple messages from a GPS device at different frequencies. After getting strings I have to save this data on the SD card. It works well when we have the same frequencies messages but ...
- 1
-1
votes
2
answers
231
views
İs that possible to a function return String OR Int depends on address
Well, I'm trying to use a HMI display and this HMI storing datas in separeta addreses. Such as integers addr. is between 0x80000 to 0x9ffff and also for string's addr is between 0 to 0x1ffff.
At this ...
- 205
1
vote
1
answer
466
views
How to convert a String to Hex array
I am trying use a HMI display. If I want to send a data, for example I want to write "TOPWAY" to 0x00000080 address it should like that:
Serial.write(0xaa); // packet head
Serial....
- 205
0
votes
1
answer
541
views
Using index of to search for multiple characters
In my Arduino project, a string will be received. I understand using .indexof to find the placement of a certain character in the string. My problem is that I need to find the first occurrence of any ...
- 1
1
vote
1
answer
89
views
Find OK or ERROR in serial string
I am trying to figure out how to capture the OK or the ERROR from a SIM800l.
I have tried
mySerial.println("AT");
while (mySerial.available() > 0 ) {
String str = mySerial.readString();
...
- 141
12
votes
6
answers
4k
views
Using String instead of C string, yet another attempt to touch a loaded issue
I've been reading a lot over the years why we should not use the notorious String class and how heap fragmentation is bad practice and not professional and we should never use it in our programs or we'...
- 391
1
vote
1
answer
2k
views
invalid conversion from 'char' to 'const char*' [-fpermissive] on a string
I am compiling some code I didn't write, and it bombs out with the error message
invalid conversion from 'char' to 'const char*' [-fpermissive]
on the line
if (loginPassword == '\0') loginPassword = &...
- 113
1
vote
1
answer
145
views
How to properly handle the Arduino String
I've read that the Arduino String is bad as it causes memory fragmentation, so I try to avoid them mostly. But I still have some occurences where I'm not quite sure if they are ok after all.
The first ...
1
vote
1
answer
432
views
Arduino Serial.readString() trouble
Hello everyone I write my code and have some troubles.
When I write on in my serial monitor my buzzer condition wasn't changed.
Can you help me realize the reason. I wrote code with int type and it ...
1
vote
1
answer
91
views
Substring: What is causing my output to be truncated?
I suspect that I might be using too many resources, because of the strings, but I am new to Arduino, so not sure where I am going wrong. Any help would be appreciated.
What it should do when complete:...
- 21
0
votes
2
answers
59
views
Get a specific item from comma separated text
I use bluetooth (works like serial monitor).
Let me say i send a text to my hc-05 (same as sending to serial monitor)
My current code is displaying text from serial monitor/HC-05 TO LCD
#include <...
0
votes
1
answer
149
views
Remove unwanted characters from char type
I'm working on an ESP8266 module that needs to fetch date data from worldtimeapi, everything works fine but the problem is How do I strip of the time field off the datetime JSON response without loop.
...
- 15
1
vote
0
answers
39
views
Can't test for equality with string received from bluetooth module
I am trying to keep the program within a loop until the user inputs "ok" on the Bluefruit Connect App. I use the readString() function on the bluetooth object (ble) to read from it. Before ...
- 21
0
votes
2
answers
1k
views
How to read incoming HEX values from Serial.read() method?
Brief description about the problem History
Communicating with a old VersaStat II used GPIB port but the GPIB ports PCI card stopped working but there was a another port 25 pin rs232 Serial ...
- 151
1
vote
2
answers
141
views
Arduino - Function -> return Cstr instead of string
I have following function for my Arduino:
String readLine() {
String received = "";
char ch;
while (myFile.available()) {
ch = myFile.read();
if (ch == '\n' or ch == '\r') {
...
- 125
1
vote
2
answers
165
views
Firmata.SendString doesn't work with specific `char` variables
I have a Firmata sketch, that accepts string messages, partitions them and sends its' parts back to a Firmata client program. My problem is certainly at the sketch's side. The problem is that Firmata....
- 153
1
vote
1
answer
158
views
String comparison problem
I have this callback function in my Firmata sketch. It receives a string as a character array and does something with it. The problem is, that the string is being sent to the Arduino in T\0h\0i\0s\0 ...
- 153
0
votes
1
answer
79
views
Any explanation for this behavior?
For the below code snippet
const char* fr_fbdb(char tag[30]) // fn for retrieving data
{
char full_path[120];
const char *_dt ;
strcpy(full_path , base_path);
strcat(full_path , tag);
...
0
votes
0
answers
55
views
Erratic behavior in String based functions
I've been working on a cipher based project, and I wanted to prep the encrypted string for use with the RF24 library. Since the payload size for the RF24 module is 32 bytes, I wanted to stick with ...
- 17
0
votes
1
answer
2k
views
What is the purpose of F() and FPSTR() in ESP8266WebServer -> FSBrowser?
I found this code sample from the FSBrowser (Flash File System) example in the ESP8266WebServer library:
replyServerError(FPSTR(FS_INIT_ERROR));
replyBadRequest(F("DIR ARG MISSING"));
I was ...
- 105
2
votes
1
answer
101
views
Why are characters with value above 127 "padded" with 1s to be 16 bits long, while ones with values 0-127 aren't?
I am using the Arduino IDE to run and monitor, with an Arduino Nano clone.
This code shows what I mean by the question:
char foo = 127;
char bar = 128;
Serial.println(String(foo, BIN));
Serial.println(...
- 23
0
votes
1
answer
358
views
Reading a string from Firebase and storing it as a CString
I have a mobile app (done using MIT App Inventor) storing some values to a Firebase database. App inventor stores all the values as strings (i.e. with quotes, and strings have quotes enclosed within ...
1
vote
0
answers
417
views
incompatible types in assignment of 'const String' to 'char [32] using server.arg
I am trying to create a class and getting getting the error
incompatible types in assignment of 'const String' to 'char [32]
when I declare
char inString[32];
and try to set it as
inString = server....
- 201
1
vote
2
answers
821
views
strcmp doesn't seem to work
I'm trying to compare a char array that I'm assembling to a string and I'm having trouble comparing the strings.
I'm getting the data for the char array as a set of bytes and I'm compiling it into a ...
- 347
1
vote
1
answer
299
views
Why use \" in arduino code?
While working with JSON parsing I noticed that the char type data string is written like this:
char json[] = "{\"sensor\":\"gps\",\"time\":1351824120,\"data\&...
- 117
0
votes
2
answers
97
views
Is there a limitation of how many instances of the `String` class?
Platform
Attiny85 with AttinyCores
1306 OLED i2c with Tiny4KDisplay
Goal
using a joystick for menu navigation
up/down choose
left enter (not finished yet)
right back (not finished yet)
inverse ...
- 103
1
vote
3
answers
113
views
Properly escaping very large strings
On an esp8266 I want to create a little webserver that shows me a dashboard with charts and stuff. For this I wanna include the echarts-library as it works offline. To access it the only way I can see ...
- 132
2
votes
1
answer
367
views
Converting c string to integer to unsigned char
I'm Trying to grapple with types between two different libraries.
The gist is that I'm using the ArduinoWebsockets library to receive information coming from my api that I then want to render out to ...
- 347
2
votes
1
answer
395
views
Comparing a String after reading it from Serial fails
I have bought an Arduino starter kit online, everything seem to work but when I try for example to use ifs (and other conditional statements), the LEDs do not turn on. Here is a code for a little ...
user70502
0
votes
1
answer
525
views
Converting 8 bit binary to a hexadecimal pair as unsigned char
I have a function:
void Epd::SendData(unsigned char data) {
digitalWrite(dc_pin, HIGH);
SpiTransfer(data);
}
At the moment I am hardcoding data sent to it by calculating on paper and then writing ...
- 111
1
vote
2
answers
2k
views
Read Comma Separated String
I have a string that looks like this "10.00,20.00,-50.00," in which these are angle values and they have 2 decimals and can be negative. I want to separate them into 3 separate floats. Here ...
1
vote
1
answer
90
views
Arduino keypad variables to serial port
I've been trying, for over a week now, to create a program that will store my keypad presses into variable, and with a press of an enter, it will switch to the next variable to store the presses. The ...
- 11
1
vote
1
answer
231
views
Cannot compile F() macro with R"string"
I am trying to compile the following code:
logger.log_info(F(R"(some text here that may take
multiple lines
and here it is done.)"));
But the compiler exists with the following ...
1
vote
1
answer
471
views
Why isn't this EEPROM.get() working?
I am trying to save a string/char to EEPROM with EEPROM.put() and then get the value, but it doesn't work and I get a blank value when I do a EEPROM.get().
I remember this is how it worked on arduino ...
- 242
0
votes
2
answers
491
views
Float array to comma separated string
I have a loop command reading temperature sensor data from 8 thermistors and are storing them as floats into an array. Instead of printing to Serial on each iteration, I would like to create a comma ...
- 163
0
votes
1
answer
112
views
Reading Serial String Gives Null Lines with JSSC
I need to send serial data to my Arduino UNO from within a java application. I am using JSSC for this.
I wanted to verify that my data actually arrives correctly to the arduino before going to the ...
- 3
1
vote
1
answer
255
views
How do i improve this Code? (or how to pass a Char String into a Function to behave like a Variable)
Sorry i am a beginner and amateur when it comes to coding, can somebody help me to make the code inside the loop() less "monkey-like" by using a proper function?
I have tried a lot and at ...
- 11
0
votes
2
answers
128
views
How can I copy and compare a string?
I have the following code (I realise String isn't very efficient, but this sketch doesn't have to be)
debugOutput gets called every loop, but I only want to spam the serial bus (to debug) if the ...
- 103
1
vote
0
answers
288
views
HC-12 problem with reading momentarily strings
I'm new here, so I hope my question is not naive.
I'm using Arduino mega connected with a pulse sensor and a GPS (and other things that are not related to our problem), pulse sensor and GPS data are ...
- 11
0
votes
1
answer
1k
views
Convert Binary to char
I'm reading a text file saved on my ESP8266 device (using LittleFS).
while (myFile.available()) {
Serial.write(myFile.read());
}
My goal is to save file content ( each line ) to a String /...
- 792
1
vote
1
answer
66
views
String(int) function stopping the Arduino
Well I am trying make an application with arduino leonardo and GSM Shield. There are conditions if, else if, else .. etc
if (smsMetni.indexOf("DURUM") != -1) {
Serial.println("SMS ...
- 205
0
votes
1
answer
741
views
Convert string to array
I have a project and i need to convert string (contain numbers and letters) to array
String name = "s111, s222, bbbb,cccc ";
and i want
array[0] = s111;
array[1] = s222;
array[2] = bbbb;
...
- 23
0
votes
2
answers
53
views
How to use "+" character as a String
Well I am trying to save phone number as a string. For ease of use I want to add "+" character programmatically. Like this:
String cepNo ="+" + "901234567";
But program ...
- 205