Expected primary-expression before '<' token............................ I want to program an arduino board to control a fan at different speeds

Using Arduino Programming Questions
#1

// déclarer la bibliothéque LiquidCrystal
#include <LiquidCrystal.h>
LiquidCrystal lcd(7, 6, 5, 4, 3, 2);

void setup() {
pinMode(13,OUTPUT);
pinMode(12,OUTPUT);
pinMode(11,OUTPUT);
pinMode(10,OUTPUT);
lcd.begin(16,2);
lcd.setCursor(1,0);
lcd.print("Temp= ");
lcd.setCursor(10,0);
lcd.print("C");
}

void loop() {
int Valeur=analogRead(A0);
int Vout=Valeur5.0/10231000;
int temp=Vout/10;

lcd.setCursor(7,0);
lcd.print(temp);
if(temp<=15)
{
digitalWrite(13,HIGH);
digitalWrite(12,LOW);
digitalWrite(11,LOW);
digitalWrite(10,LOW);
}
else if((temp >= 30) && (temp =< 34))
{
digitalWrite(12,HIGH);
digitalWrite(11,LOW);
digitalWrite(10,LOW);
digitalWrite(13,LOW);
}
else if((temp > 34) && (temp =<38))
{
digitalWrite(11,HIGH);
digitalWrite(12,LOW);
digitalWrite(10,LOW);
digitalWrite(13,LOW);
}
else if(temp > 38)
{
digitalWrite(10,HIGH);
digitalWrite(11,LOW);
digitalWrite(12,LOW);
digitalWrite(13,LOW);
}
else {
digitalWrite(12,LOW);
digitalWrite(13,LOW);
}
}

#2

Hello, do yourself a favour and please read How to get the best out of this forum and modify your post accordingly (including code tags and necessary documentation for your ask).

the compiler likely gave you more info

#3

There?

"<="

#4

@mondherayeb, your topic has been moved to a more suitable location on the forum. Installation and Troubleshooting is not for problems with (nor for advise on) your project. See About the Installation & Troubleshooting category.