I know this has been raised before, and belive me I have read many posts about this problem, but non have worked or not applicable to my setup.
I am using a arduino Nano for a range measure and digital spirit level project.
I am also using 2 full size? breadboards fastend side by side.
I have checked that LCD works by connecting it up to a Arduino Uno on another breadboard and uploading the Hello World code, which the LCD displays fine.
I then moved the lcd screen back onto the double breadboard and used the exact same wiring configuration as it was with the arduino, but there was no change . The LCD screen was still blank.
I found that when I was using a USB port to power up the Nano and other items on the board, the lcd screen was blank. After quite sometime of trying to find out why , I measured some of the supposedly 5v voltages etc. The lcd 5v pin was only showing around 3.8v to 4.3V. The Nano 5v pin was also only showing around 4.7v.
I then used a 5v power supply plug and then there was just 1 row of white squares on the lcd screen. I then tried a 8.5v battery supply and that bought up 2 rows of white squares against just 5v.
The code below is only a part of the full 257 lines, but should be enough. I can only attch 2 pictures as the size of all of them exceeds 2mb
/*
DIY Digital Range Measurer and Spirit Level
by Dejan Nedelkovski,
www.HowToMechatronics.com
*/
#include<Wire.h> // I2C communication library
#include <LiquidCrystal.h> // includes the LiquidCrystal Library
LiquidCrystal lcd(7, 6, 5, 4, 3, 2); // Creates an LCD object. Parameters: (rs, enable, d4, d5, d6, d7)
const int MPU = 0x68; // I2C address of the MPU6050 accelerometer
#define trigPin 8
#define echoPin 9
#define selectButton 10
int16_t AcX, AcY, AcZ;
long duration;
float distance;
int program = 0;
float d = 0;
float d1 = 0;
float d2 = 0;
float area = 0;
int axis = 0;
int angle = 0;
int unitSelect = 0;
String unit = "cm";
void setup() {
// Initialize interface to the MPU6050
Wire.begin();
Wire.beginTransmission(MPU);
Wire.write(0x6B);
Wire.write(0);
Wire.endTransmission(true);
lcd.begin(16, 2); // Initializes the interface to the LCD screen
pinMode(trigPin, OUTPUT);
pinMode(echoPin, INPUT);
pinMode(selectButton, INPUT_PULLUP);
}
void loop() {
switch (program) { // Switch between different programs
case 0: // Select unit of measurement
lcd.setCursor(0, 0); // Sets the location at which subsequent text written to the LCD will be displayed
lcd.print("Select Unit: ");
lcd.setCursor(13, 0);
lcd.print(unit);
lcd.print(" ");
delay(10);
// If button is pressed - change unit
if (digitalRead(selectButton) == 0) {
if (unitSelect == 0) {
unit = "in";
unitSelect = 1;
}
else if (unitSelect == 1) {
unit = "m";
unitSelect = 2;
}
else if (unitSelect == 2) {
unit = "ft";
unitSelect = 3;
}
else if (unitSelect == 3) {
unit = "cm";
unitSelect = 0;
}
// If button is held longer then half a second - change program
delay(500);
if (digitalRead(selectButton) == 0) {
program = 1;
lcd.clear();
delay(500);
}
}
break;
case 1: // Distance measuring program
distance = getDistance(); // Distance to the nearest object
lcd.setCursor(0, 0);
lcd.print("Dist: ");
lcd.print(distance); // Prints the distance value from the sensor
lcd.print(" ");
lcd.setCursor(14, 0);
lcd.print(unit);
delay(10);
lcd.setCursor(0, 1);
lcd.print("d:");
lcd.setCursor(8, 1);
lcd.print("d:");
delay(200);
// Save distance 1
if (digitalRead(selectButton) == 0) {
if (d == 0) {
lcd.setCursor(0, 1);
lcd.print("d: ");
lcd.setCursor(2, 1);
lcd.print(distance);
d = 1;
delay(100);
}
// Save distance 2
else if (d == 1) {
lcd.setCursor(8, 1);
lcd.print("d: ");
lcd.setCursor(10, 1);
lcd.print(distance);
d = 0;
delay(100);
}
// If button is held longer then half sencond change program
delay(500);
if (digitalRead(selectButton) == 0) {
program = 2;
d = 0;
lcd.clear();
delay(500);
}
}
break;
It may be possible just to straighten the pins out.)