I've made this small device that uses a ultrasonic sensor to tell how far away an object is and display it on a 16x2 display.
Here's the code:
#include <LiquidCrystal.h>
int Contrast=100;
LiquidCrystal lcd(12, 11, 5, 4, 3, 2);
const int trigPin = 7;
const int echoPin = 8;
// defining variables
long duration;
int distance;
void setup() {
pinMode(trigPin, OUTPUT); // Sets the trigPin as an Output
pinMode(echoPin, INPUT); // Sets the echoPin as an Input
Serial.begin(9600); // Starts the serial communication
analogWrite(6, Contrast);
lcd.begin(16, 2);
lcd.clear();
}
void loop() {
// Clears the trigPin
digitalWrite(trigPin, LOW);
delayMicroseconds(2);
// Sets the trigPin on HIGH state for 10 micro seconds
digitalWrite(trigPin, HIGH);
delayMicroseconds(10);
digitalWrite(trigPin, LOW);
// Reads the echoPin, returns the sound wave travel time in microseconds
duration = pulseIn(echoPin, HIGH);
// Calculating the distance
distance = duration / 29 / 2;
// Prints the distance on the Serial Monitor
Serial.print("Distance: ");
Serial.println(distance);
lcd.setCursor(0, 0);
lcd.print("Distance: ");
lcd.setCursor(0, 1);
lcd.print(distance);
delay(100);
lcd.clear();
}
Every thing works fine apart from the fact that the lcd backlight is too dim(barely visible). I tried looking online but is there any way i can get max brightness without a potentiometer? I do have resistors , can i use them somehow?
