Hi
Im struggling to use the LCD4BIT library although i have got the example code that comes with it working well, ive tried the standard liquidcrystal library for simplicity but i cant even get the example to work.. so i want to perservere with the LCD4BIt library
i would be very grateful if someone could show me how to write a integer variable to the LCD using the LCD4BIT library.
thanks
Dan
here is the code im currently trying to use, im new to C++ as you will proberbly be able to tell from my code. i think the problem has something to do with the way im trying to type cast from an Int to char* as i dont think i fully understand the use of pointers.
#include <LCD4Bit.h>
//create object to control an LCD.
//number of lines in display=1
LCD4Bit lcd = LCD4Bit(1);
int rpm = 100;
char* rpmlocation ; //address of rpm varible???
void setup() {
pinMode(13, OUTPUT); //we'll use the debug LED to output a heartbeat
lcd.init();
}
void loop() {
rpm = 120;
digitalWrite(13, HIGH); //light the debug LED
rpmlocation = (char*) rpm; //convert to rpm int to char*
lcd.clear();
lcd.printIn(rpmlocation);
delay(1000);
digitalWrite(13, LOW);
}
I think you may need to convert the 'rpm' integer variable to a string with 'itoa':
char buf[32];
itoa (rpm, buf, 10);
lcd.printIn(buf);
Your code makes a char pointer, and points it at 'rpm', but that won't do the required conversion from binary to ASCII decimal digits.
Thanks for your help, the code you suggested worked great. And ive been able to measure RPM quite well since this morning 
Ive also since figured out how to send a decimal to the lcd using this bit of code if any noobs like me would like to use it to save them selves some head scratching
void printfloat(float all , int decimals){ // will only work with lcd4bit library, basically it breaks the float into 2 integers then prints them seperatley with decimal point in the middle.
int decimal = 1 ;// intial multiplier so you dont get the situation decimal = 0 * 10 arrising
while(decimals > 0) // calculate the multipler for moving the decimal along i.e. *10 *100 *1000 etc
{
decimal = decimal * 10 ;
decimals = decimals - 1;
}
int parta; // the first part of the float (numbers after the decimal point)
int partb; // the last part of the part (numbers before the decimal point)
parta = int(all); // converting the float into an integer droping the info after the decimal
partb = (all * decimal) - (parta * decimal); // messing around to derive the integer form of the numbers before the decimal
itoa (parta, buf, 10);
lcd.printIn(buf);
if (partb > 0) // tests to see if the decimal is actually needed, delete if you always want the decimal i.e. xx.0
{
lcd.printIn(".");
itoa (partb, buf, 10);
lcd.printIn(buf);
}