# Error: Expected initializer before "void"

**URL:** <https://forum.arduino.cc/t/error-expected-initializer-before-void/401633>\
**Category:** Programming\
**Created:** [August 8, 2016, 11:56am UTC](https://forum.arduino.cc/t/error-expected-initializer-before-void/401633 "2016-08-08T11:56:17Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![Mariia](https://avatars.discourse-cdn.com/v4/letter/m/9dc877/32.png) [@Mariia](https://forum.arduino.cc/u/Mariia)\
**Post date:** [August 8, 2016, 11:56am UTC](https://forum.arduino.cc/t/error-expected-initializer-before-void/401633/1 "2016-08-08T11:56:17Z")

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const int sensor = 0;  
const int ledRojo = 5;  
const int ledAzul = 6;

long miliVolts;  
long temperatura;  
int brillo

void setup()  
{  
[//Serial.begin](https://Serial.begin)(9600);  
pinMode(ledRojo, OUTPUT);  
pinMode(ledAzul, OUTPUT);

}

**void loop ()**  
{  
miliVolts = (analogRead (sensor) \* 5000L) /1023;  
temperatura = miliVolts / 10;

brillo = map(temperatura, 10, 40, 0, 255);  
brillo = constrain(brillo, 0, 255);

analogWrite(ledRojo, brillo);  
analogWrite(ledAzul, 255-brillo);

}

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<div class="post-metadata">

**Author:** ![olf2012](https://avatars.discourse-cdn.com/v4/letter/o/f9ae1b/32.png) [@olf2012](https://forum.arduino.cc/u/olf2012)\
**Post date:** [August 8, 2016, 12:03pm UTC](https://forum.arduino.cc/t/error-expected-initializer-before-void/401633/2 "2016-08-08T12:03:09Z")

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You are missing a semicolon after the declaration of brillo

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<div class="post-metadata">

**Author:** ![system](https://dub1.discourse-cdn.com/arduino/user_avatar/forum.arduino.cc/system/32/1140315_2.png) [@system](https://forum.arduino.cc/u/system)\
**Post date:** [May 5, 2021, 10:01pm UTC](https://forum.arduino.cc/t/error-expected-initializer-before-void/401633/3 "2021-05-05T22:01:44Z")

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Closed on May 5, 2021, 10:01pm UTC