I have a strange issue. For me.
I am building some sort of an RGB controller, based on Atmega328p. There are 5 buttons, an LCD I2C, MOSFETs, etc. The idea is to change a value or two, and control an RGB LED strip. The problem is with the backlight.
I use this library:
When I use Hello World example it works just fine.
However, when I used this sketch, it doesn't work as expected.
#include <Wire.h>
#include <LiquidCrystal_I2C.h>
LiquidCrystal_I2C lcd(0x27,16,2);
//touch inputs
const int switch1 = 8; //sw2 - plus default
const int switch2 = 3; //sw3 - minus default
const int switch3 = 4; //SW4 - Red plus
const int switch4 = 5; //sw5 - Green plus
const int switch5 = 7; //sw6 - Blue plus
//RGB outputs
const int ledG = 9; //ch1
const int ledR = 10; //ch2
const int ledB = 11; //ch3
const int ledW = 6; //ch4
//IR
const int IRpin = 7;
//misc
int switchCase = 0;
int valueG, valueR, valueB;
void setup() {
Serial.begin(9600);
lcd.init();
lcd.backlight();
lcd.setCursor(0,0);
lcd.print("hello, wolrd");
pinMode(switch1, INPUT);
pinMode(switch2, INPUT);
pinMode(switch3, INPUT);
pinMode(switch4, INPUT);
pinMode(switch5, INPUT);
pinMode(ledG, OUTPUT);
pinMode(ledR, OUTPUT);
pinMode(ledB, OUTPUT);
pinMode(ledW, OUTPUT);
digitalWrite(ledG, LOW);
digitalWrite(ledR, LOW);
digitalWrite(ledB, LOW);
digitalWrite(ledW, LOW);
delay(2000);
lcd.clear();
}
void loop() {
switchRead();
switchMode();
lcdDisplay();
//delay(500);
}
void switchRead(){
//plus case
if(digitalRead(switch1)== HIGH && switchCase != 9){
//Serial.println("+1");
switchCase = ++switchCase;
}
//minus case
if(digitalRead(switch2) == HIGH && switchCase != 0){
//Serial.println("-1");
switchCase = --switchCase;
}
//plus RED
if(digitalRead(switch3) == HIGH && valueR != 255){
switchCase = 10;
//Serial.println("red +1");
}
//plus green
if(digitalRead(switch4) == HIGH && valueG != 255){
switchCase = 11;
//Serial.println("green +1");
}
//plus blue
if(digitalRead(switch5) == HIGH && valueB != 255){
switchCase = 12;
//Serial.println("blue +1");
}
//Serial.println((String)valueG+" "+valueR+" "+valueB);
}
void switchMode(){
switch(switchCase){
case 0: //red
valueG = 0;
valueR = 255;
valueB = 0;
//Serial.println("0");
break;
case 1: //green
valueG = 255;
valueR = 0;
valueB = 0;
//Serial.println("1");
break;
case 2: //blue
valueG = 0;
valueR = 0;
valueB = 255;
//Serial.println("2");
break;
case 3: //violet
valueG = 0;
valueR = 128;
valueB = 255;
//Serial.println("3");
break;
case 4: //pink
valueG = 0;
valueR = 255;
valueB = 255;
//Serial.println("4");
break;
case 5: //yellow
valueG = 255;
valueR = 255;
valueB = 0;
//Serial.println("5");
break;
case 6: //tirquise
valueG = 128;
valueR = 0;
valueB = 128;
//Serial.println("6");
break;
case 7: //orange
valueG = 128;
valueR = 255;
valueB = 0;
//Serial.println("7");
break;
case 8: //bordo
valueG = 0;
valueR = 128;
valueB = 128;
//Serial.println("8");
break;
case 9: //white
valueG = 255;
valueR = 255;
valueB = 255;
//Serial.println("9");
break;
case 10: //red +
valueR = valueR+1;
//Serial.println("10");
switchCase = -1;
break;
case 11: //green +
valueG = valueG+1;
//Serial.println("11");
switchCase = -1;
break;
case 12: //blue +
valueB = valueB+1;
//Serial.println("12");
switchCase = -1;
break;
}
}
void lcdDisplay(){
lcd.clear();
lcd.setCursor(0,0);
lcd.print("Red");
lcd.setCursor(4,0);
lcd.print("Grn");
lcd.setCursor(8,0);
lcd.print("Blu");
lcd.setCursor(14,0);
lcd.print("Ps");
lcd.setCursor(0,1);
lcd.print("Blu");
lcd.setCursor(4,1);
lcd.print("Blu");
lcd.setCursor(8,1);
lcd.print("Blu");
lcd.setCursor(14,1);
lcd.print("Blu");
}
When I use this sketch I wrote, I get the first character most bright, and the brightness goes down to the last character at the bottom row. LCD is 16x2, with PCF8574. Just like it doesn't get enough power. But it works with the example on the same board. I measured the voltage on the LCD, it is 5V. Pot can not fix this problem
I believe I messed something with the code. But not sure what. The bottom line should print RGB values, etc.
I repeat, everything is fine with the example from the library, this sketch above is not.
