Hi Folks
I am working on a little project and stumpled into a problem:
I have a interrupt reading whenever a RISING is happening on pin 2. Counting theese and when my timer interrupt tells to it calculates the rpm of an engine.
When printing to Serial, the code works perfect. But I want to see the result on a 16X2 lcd (http://www.banggood.com/IICI2C-1602-Yellow-Green-Backlight-LCD-Display-Module-For-Arduino-p-950728.html).
And here the problem comes !
In the code I can init the display (and still see results in serial monitor when debugging), but as soon as I start writing to the display nothing happens and everything stops ?
Any suggestions ?
#include <Wire.h>
#include <LiquidCrystal_I2C.h>
LiquidCrystal_I2C lcd(0x27,16,2);
int counts =0;
void setup(){
// Serial.begin(115200);
lcd.init();
lcd.backlight();
cli();//stop interrupts
TCCR1A = 0;// set entire TCCR1A register to 0
TCCR1B = 0;// same for TCCR1B
TCNT1 = 0;//initialize counter value to 0
// set compare match register for 1hz increments
OCR1A = 7812;// = Interrupt interval
// turn on CTC mode
TCCR1B |= (1 << WGM12);
// Set CS12 and CS10 bits for 1024 prescaler
TCCR1B |= (1 << CS12) | (1 << CS10);
// enable timer compare interrupt
TIMSK1 |= (1 << OCIE1A);
sei();//allow interrupts
attachInterrupt(digitalPinToInterrupt(2),calc,RISING);
}//end setup
ISR(TIMER1_COMPA_vect){
detachInterrupt(2);
lcd.setCursor(1,1);
lcd.print(" ");
lcd.setCursor(1,1);
lcd.print(counts*2*60);
/*
Serial.print(counts*2*60);
Serial.println(" RPM");
*/
counts=0;
attachInterrupt(digitalPinToInterrupt(2),calc,RISING);
}
void calc(){
counts++;
}
void loop(){
//do other things here
}
