Skip to main content
Arduino

Return to Question

Bumped by Community user
added 178 characters in body
Source Link
chrisl
chrisl
  • 16.6k
  • 2
  • 18
  • 27

See the output of serial terminal when i typed "Hello" with quotes. 12:03:46.536 -> Buffer Received= " No match found 12:03:46.569 ->
12:03:46.569 -> Buffer Received= Hello" 12:03:46.603 -> Found Hello when i typed "HELLO" with quotes. 12:03:55.855 -> Buffer Received= " No match found 12:03:55.888 ->
12:03:55.888 -> Buffer Received= HELLO" 12:03:55.921 -> Found HELLO **See the output of serial terminal when i typed "Hello" with quotes.

12:03:46.536 -> Buffer Received= "  No match found
12:03:46.569 ->  
12:03:46.569 -> Buffer Received= Hello"
12:03:46.603 ->     Found Hello
when i typed "HELLO" with quotes. 
12:03:55.855 -> Buffer Received= "  No match found
12:03:55.888 ->  
12:03:55.888 -> Buffer Received= HELLO"
12:03:55.921 ->     Found HELLO**

when i typed "heLLo" with quotes. 12:04:04.016 -> Buffer Received= " No match found 12:04:04.049 ->
12:04:04.049 -> Buffer Received= heLLo" 12:04:04.082 -> Found heLLo 12:04:04.115 -> ****when i typed "heLLo" with quotes.

12:04:04.016 -> Buffer Received= "  No match found
12:04:04.049 ->  
12:04:04.049 -> Buffer Received= heLLo"
12:04:04.082 ->     Found heLLo
12:04:04.115 ->****

When i typed without quotes, all i get No match found

** char buffer[100]; uint8_t index=0;

void setup() { Serial.begin(9600); _delay_ms(4000); }

void loop() { if(Serial.available()>0) { index=0; while(Serial.available()) { buffer[index++]=Serial.read(); }

char buffer[100];
uint8_t index=0;

void setup()
{
  Serial.begin(9600);
  _delay_ms(4000);
}

void loop()
{
  if(Serial.available()>0)
  {
    index=0;
    while(Serial.available())
    {
      buffer[index++]=Serial.read();
    }
    
    buffer[index]='\0';
    Serial.println(' ');
    Serial.print("Buffer Received");
    Serial.print(buffer);
    Serial.print('\t');
    if(strstr(buffer, "Hello")!=NULL) Serial.println("Found Hello");
    else if(strstr(buffer, "HELLO")!=NULL) Serial.println("Found HELLO");
    else if(strstr(buffer, "heLLo")!=NULL) Serial.println("Found heLLo");
    else Serial.println("No match found");
    Serial.flush();
  }
}

} } **

See the output of serial terminal when i typed "Hello" with quotes. 12:03:46.536 -> Buffer Received= " No match found 12:03:46.569 ->
12:03:46.569 -> Buffer Received= Hello" 12:03:46.603 -> Found Hello when i typed "HELLO" with quotes. 12:03:55.855 -> Buffer Received= " No match found 12:03:55.888 ->
12:03:55.888 -> Buffer Received= HELLO" 12:03:55.921 -> Found HELLO

when i typed "heLLo" with quotes. 12:04:04.016 -> Buffer Received= " No match found 12:04:04.049 ->
12:04:04.049 -> Buffer Received= heLLo" 12:04:04.082 -> Found heLLo 12:04:04.115 ->

When i typed without quotes, all i get No match found

** char buffer[100]; uint8_t index=0;

void setup() { Serial.begin(9600); _delay_ms(4000); }

void loop() { if(Serial.available()>0) { index=0; while(Serial.available()) { buffer[index++]=Serial.read(); }

buffer[index]='\0';
Serial.println(' ');
Serial.print("Buffer Received");
Serial.print(buffer);
Serial.print('\t');
if(strstr(buffer, "Hello")!=NULL) Serial.println("Found Hello");
else if(strstr(buffer, "HELLO")!=NULL) Serial.println("Found HELLO");
else if(strstr(buffer, "heLLo")!=NULL) Serial.println("Found heLLo");
else Serial.println("No match found");
Serial.flush();

} } **

**See the output of serial terminal when i typed "Hello" with quotes.

12:03:46.536 -> Buffer Received= "  No match found
12:03:46.569 ->  
12:03:46.569 -> Buffer Received= Hello"
12:03:46.603 ->     Found Hello
when i typed "HELLO" with quotes. 
12:03:55.855 -> Buffer Received= "  No match found
12:03:55.888 ->  
12:03:55.888 -> Buffer Received= HELLO"
12:03:55.921 ->     Found HELLO**

****when i typed "heLLo" with quotes.

12:04:04.016 -> Buffer Received= "  No match found
12:04:04.049 ->  
12:04:04.049 -> Buffer Received= heLLo"
12:04:04.082 ->     Found heLLo
12:04:04.115 ->****

When i typed without quotes, all i get No match found

char buffer[100];
uint8_t index=0;

void setup()
{
  Serial.begin(9600);
  _delay_ms(4000);
}

void loop()
{
  if(Serial.available()>0)
  {
    index=0;
    while(Serial.available())
    {
      buffer[index++]=Serial.read();
    }
    
    buffer[index]='\0';
    Serial.println(' ');
    Serial.print("Buffer Received");
    Serial.print(buffer);
    Serial.print('\t');
    if(strstr(buffer, "Hello")!=NULL) Serial.println("Found Hello");
    else if(strstr(buffer, "HELLO")!=NULL) Serial.println("Found HELLO");
    else if(strstr(buffer, "heLLo")!=NULL) Serial.println("Found heLLo");
    else Serial.println("No match found");
    Serial.flush();
  }
}
Source Link
Avong
Avong
  • 11
  • 3

Issues with Arduino UNO printing repeated "double" on serial monitor

A weird is happening which i can't figure out why. First I had issue communicating with SIM800L. So i tried checking the USART Hardware to see what UNO sends to SIM800 using small piece attached below. The sketch is to compares what i send from serial monitor with strings "Hello", "heLLo" and "Hello" expecting to get Found .... or No match found. each line string i send, the serial monitor prints twice WHY?, The first says not found and the second say Received == ........ WHY?

See the output of serial terminal when i typed "Hello" with quotes. 12:03:46.536 -> Buffer Received= " No match found 12:03:46.569 ->
12:03:46.569 -> Buffer Received= Hello" 12:03:46.603 -> Found Hello when i typed "HELLO" with quotes. 12:03:55.855 -> Buffer Received= " No match found 12:03:55.888 ->
12:03:55.888 -> Buffer Received= HELLO" 12:03:55.921 -> Found HELLO

when i typed "heLLo" with quotes. 12:04:04.016 -> Buffer Received= " No match found 12:04:04.049 ->
12:04:04.049 -> Buffer Received= heLLo" 12:04:04.082 -> Found heLLo 12:04:04.115 ->

When i typed without quotes, all i get No match found

** char buffer[100]; uint8_t index=0;

void setup() { Serial.begin(9600); _delay_ms(4000); }

void loop() { if(Serial.available()>0) { index=0; while(Serial.available()) { buffer[index++]=Serial.read(); }

buffer[index]='\0';
Serial.println(' ');
Serial.print("Buffer Received");
Serial.print(buffer);
Serial.print('\t');
if(strstr(buffer, "Hello")!=NULL) Serial.println("Found Hello");
else if(strstr(buffer, "HELLO")!=NULL) Serial.println("Found HELLO");
else if(strstr(buffer, "heLLo")!=NULL) Serial.println("Found heLLo");
else Serial.println("No match found");
Serial.flush();

} } **

Note: Suspecting my PC hardware and serial driver, so I tried it in my Ubuntu 20.04 and window 10 installed with Arduino IDE 1.8.13 suspecting it may be crystal, i tried two different boards and used even Atmega328P core. I also suspected my keyboard "ENTER" key, so i tried the serial monitor "send" button.
with no difference.

I seems to run short is ideas so i am posting to the community. Let me have your advice and experience too.

Thanks.