The Serial Monitor of Arduino has a text box at the top, through which, users can send in text to the Arduino board.The text can be read by Serial.read(). Also, the Serial.available() function can be used to check if there is any data to read. It returns the number of ... Read More

The remove function in Arduino helps you remove one or more characters from within a string.SyntaxmyString.remove(index, count)Here, index refers to the index from where removal has to start. Note that indexing in Arduino starts with 0. Thus, within string "Hello", 'H' is at index 0, 'e' is at index 1, and ... Read More

In case you don’t want to overwrite a string, but just change a character at a specific position, Arduino provides the setCharAt() function exactly for that.SyntaxString1.setCharAt(ind, new_char);String 1 is the string to modify. ind is the index where the character needs to be set. new_char is the value of the new ... Read More

In this article, we will walkthrough the example code in Arduino, which helps generate the ASCII table in the Serial Monitor output. For your reference, this is what the ASCII table looks like − http://www.asciitable.com/It contains the character, followed by its ASCII code in decimal, hexadecimal, and sometimes, even octal ... Read More

Just like indexOf() helps identify the first occurrence of a substring within a string, the lastIndexOf() function helps identify the last occurrence. This is because lastIndexOf() performs backward search, while indexOf() performs forward search.syntaxmyString.lastIndexOf(substr)Where substr is the substring to search for in myString. It can be a character or a string.Just like indexOf(), this ... Read More

The indexOf() function within Arduino scans a string from the beginning, and returns the first index of the specified substring within the string. The syntax is −SyntaxmyString.indexOf(substr)where substr is the substring to search for. It can be of type character or string.Optionally, you can provide a different starting point to begin the search ... Read More

Sometimes, a string can contain leading or trailing whitespaces. Arduino has a trim() function that removes all these leading/trailing whitespaces from the string.SyntaxString1.trim()Where String1 is the string that you need to trim. Please note that this function doesn’t return anything. String1 itself is modified.ExampleThe following example illustrates this −void setup() ... Read More

Semaphore and Mutex are tools/mechanisms to bring about synchronization between tasks in FreeRTOS. Often, two tasks need to share a resource, or one task needs to tell another that it is idle/waiting. Semaphores and Mutex help here. In this article, we will look at the concepts of semaphore and mutex.SemaphoreA ... Read More

By default, on a Windows machine, Arduino saves all the sketches in C:\Users\\Documents\Arduino. Now, for whatever reason, you may want to change this default location. A common reason is that the C: has limited storage and you’d like to save sketches to a drive which has enough free space.In order ... Read More

If you wish to suspend a task in FreeRTOS, there is a function vTaskSuspend() that can be used. The syntax is −Syntaxvoid vTaskSuspend( TaskHandle_t xTaskToSuspend );As you can see, it takes the handle of the task to suspend as the argument and returns nothing. A suspended task can be resumed using vTaskResume(). ... Read More