Arduino LipoChecker

/*
 * Arduino LiPo Checker
 *
 * learnelectronics
 * 30 JUN 2017
 *
 * www.youtube.com/c/learnelectronics
 * [email protected]
 *
 *
 *
 * NOTE: My 18650 gave these readings, yours may differ. If it does simply change the values in the if statements:
 *
 * 4.2V   975
 * 3.7V   882
 * 2.7V   650
 */

#define red   6
#define yellow 4
#define green 3
#define lipo  A0

float lipoV = 0;





void setup() {

pinMode(red,OUTPUT);
pinMode(yellow,OUTPUT);
pinMode(green,OUTPUT);
pinMode(lipo,INPUT);
Serial.begin(9600);
}

void loop() {

lipoV = analogRead(lipo);


Serial.println(lipoV);

if(lipoV<650){
  digitalWrite(red,HIGH);
  digitalWrite(yellow,LOW);
  digitalWrite(green,LOW);
}
if(lipoV>800 && lipoV<950){
  digitalWrite(red,LOW);
  digitalWrite(yellow,HIGH);
  digitalWrite(green,LOW);
}
if(lipoV>950){
  digitalWrite(red,LOW);
  digitalWrite(yellow,LOW);
  digitalWrite(green,HIGH);
}
}