Question

Using the Arduino IDE, write a program for an Arduino board that will perform the following three tasks:

1. Input: Prompt the user to enter a character string. Read the character string from your computer through the Arduino's serial interface.

2. Processing: Convert lowercase characters to uppercase and uppercase characters to lowercase, and

3. Output: Return the processed string through the serial output and display it on your computer screen.

Example: If the input character string is, “Here I am”, the output should be, “hERE i AM”. For serial input and output purposes, you should use the serial monitor.

Answer 1

char inst[100],outst[100],a;
int i=0,j=0;
void setup() {
Serial.begin(9600);
displayinputstring();
displayoutputstring();
}

void loop() {
if(Serial.available()>0) {
a=Serial.read();
inst[i++]=a;
if(isLowerCase(a)){
int b=int(a)-32;
outst[j++]=char(b);
}
else {
int b=int(a)+32;
outst[j++]=char(b);
}
}
}

void displayoutputstring()
{
for(int k=0;k<j;k++)
Serial.print(outst[i]);
}

void displayinputstring()
{
for(int k=0;k<i;k++)
Serial.print(inst[i]);
}