/*
LiquidCrystal Library - Hello World
Demonstrates the use a 16x2 LCD display. The LiquidCrystal
library works with all LCD displays that are compatible with the
Hitachi HD44780 driver. There are many of them out there, and you
can usually tell them by the 16-pin interface.
This sketch prints "Hello World!" to the LCD
and shows the time.
The circuit:
* LCD RS pin to digital pin 12
* LCD Enable pin to digital pin 11
* LCD D4 pin to digital pin 5
* LCD D5 pin to digital pin 4
* LCD D6 pin to digital pin 3
* LCD D7 pin to digital pin 2
* LCD R/W pin to ground
* LCD VSS pin to ground
* LCD VCC pin to 5V
* 10K resistor:
* ends to +5V and ground
* wiper to LCD VO pin (pin 3)
This example code is in the public domain.
https://docs.arduino.cc/learn/electronics/lcd-displays
*/
// include the library code:
#include <LiquidCrystal.h>
// initialize the library by associating any needed LCD interface pin
// with the arduino pin number it is connected to
const int rs = 12, en = 11, d4 = 5, d5 = 4, d6 = 3, d7 = 2;
LiquidCrystal lcd(rs, en, d4, d5, d6, d7);
void setup() {
// set up the LCD's number of columns and rows:
lcd.begin(16, 2);
// Print a message to the LCD.
lcd.print("hello, world!");
}
void loop() {
// set the cursor to column 0, line 1
// (note: line 1 is the second row, since counting begins with 0):
lcd.setCursor(0, 1);
// print the number of seconds since reset:
lcd.print(millis() / 1000);
}
The bottom line is not showing, but the top line is not truly showing either, only blocks are appearing. This is normal situation when the LCD is not correctly wired and initialised.
Because you are using an example sketch from the library, the code to initialise the LCD should be correct.
So I think it must be your wiring that has a fault.
It's too difficult to follow the wires in your photos, so please post a schematic diagram for the forum to check for you. When I say schematic, this does not mean a breadboard wiring diagram, like you might draw in breadboard view in Fritzing. If you are using Fritzing, use the schematic view. Or you can hand-draw the schematic with pen and paper.
The schematic should be drawn from your circuit, as seen in the photos. Don't post someone else's schematic, because they probably did not make the same mistake you made.
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could this be because of the contrast?
No,I don't think so. The blocks are clear, so there is no problem with contrast.
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