Compilation Error Messages

Projects Programming
21

int led = 12 ;
int BUTTON = 4;

void setup()
{
pinMode{led, OUTPUT}
pinMode{BUTTON,INPUT}
}
void loop()
if {digitalRead{BUTTON} == HIGH};
{
digitalWrite{LED, HIGH,};
} else
{
digitalWrite{LED, LOW};
}
}

and it always say

expected ';' before '{' token
or
expected ',' before '{' token
HELP

22

When you declare a variable, the syntax is

;

(there's more to it than that, but we'll stop there in this post)

This line

dht11 DHT11; // [color=red]this is I think where the error is..[/color]

defines a variable of type dht11 named DHT11.

C++ is case-sensitive, and the usual convention is that we use uppercase for types. It is most likely tha the DHT-11 library follows this convention. In other words, there is no type dht11 defined anywhere: you may as well have written

FooBarBaz DHT11; // [color=red]this is I think where the error is..[/color]

And you may find if you test that line that you get the same error back. You probably actually meant

DHT11 dht11;
23

These need ( ) instead of { }
pinMode{led, OUTPUT}

Here too
if {digitalRead{BUTTON} == HIGH};

and here
digitalWrite{LED, HIGH,};

Syntax for loop( ) :

void loop()
{ // starting bracket
// button read, LED writes, etc
} // ending bracket

You have them correct for setup( )

24 
void loop() {
  if (digitalRead(BUTTON) == HIGH)
  {
   digitalWrite(LED, HIGH); // this had an extra , as well
  }
  else
  {
   digitalWrite(LED, LOW);
  }
}
26

what to do if when i try to upload the code i recieve this error:
Arduino: 1.8.12 (Windows 10), Board: "Arduino Uno"

Sketch uses 2774 bytes (8%) of program storage space. Maximum is 32256 bytes.
Global variables use 171 bytes (8%) of dynamic memory, leaving 1877 bytes for local variables. Maximum is 2048 bytes.
F:\arduino\hardware\tools\avr/bin/avrdude -CF:\arduino\hardware\tools\avr/etc/avrdude.conf -v -patmega328p -carduino -PCOM4 -b115200 -D -Uflash:w:C:\Users\raris\AppData\Local\Temp\arduino_build_891841/sketch_apr14a.ino.hex:i

An error occurred while uploading the sketch
avrdude: Version 6.3-20190619
Copyright (c) 2000-2005 Brian Dean, http://www.bdmicro.com/
Copyright (c) 2007-2014 Joerg Wunsch

System wide configuration file is "F:\arduino\hardware\tools\avr/etc/avrdude.conf"
avrdude: can't open config file "F:\arduino\hardware\tools\avr/etc/avrdude.conf": No such file or directory
avrdude: error reading system wide configuration file "F:\arduino\hardware\tools\avr/etc/avrdude.conf"

This report would have more information with
"Show verbose output during compilation"
option enabled in File -> Preferences.