Thanks.When nothing shows on the LCD here are three things to check:
1) Adjust the contrast voltage. Make sure that you can see black rectangles with just power applied.
2) Check the initialization procedure. Sometimes it helps to initialize the LCD twice when using 4-bit mode.
3) Install a 100nF ceramic capacitor between Vcc and GND right at the LCD.
I don't know what you mean by that statement.Thanks.
Sorry I didn't tell that every time I just test one LCD.
Thanks.I don't know what you mean by that statement.
// 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;
const int rs = 8, en = 9, d4 = 10, d5 = 11, d6 = 12, d7 = 13;
///// const int rs = 7, en = 6, 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);
}
Thats one of the issues with ISIS simulation... The Vdd/Vss and Vee are not modelled.. Only when he tries too build for real, that will become a problem..If the diagrams you show are accurate, none of the displays will work. In the left diagram, the upper display has the backlight (VDD) tied to RS and the lower one VDD is not connected to anything. It is the same in the right diagram.
Your posting is very brief and vague. What exactly are you trying to do? What exactly is the problem. A few more details would make it much easier for us to help you.
Just out of curiosity what was the problem?Thanks for all helpers.
It is OK now.
Thanks.Just out of curiosity what was the problem?
Thanks. I wasn't aware of that. I never used ISIS simulation. In fact, I don't use any simulation programs. I prefer to breadboard my circuits to test my designs.Thats one of the issues with ISIS simulation... The Vdd/Vss and Vee are not modelled.. Only when he tries too build for real, that will become a problem..
Thanks.It is more than just curiosity. In the spirit of open community forums it is common courtesy and practice to share with others how you managed to solve the problem. This can be useful to others having the same issue and expands the overall knowledge base and experience of everyone involved.
Thanks.@LAOADAM One thing I didn't notice in your code was any initialization of the LCDs. Usually there is a byte sequence in the LCD controller datasheet to follow to get everything set up right. There are a couple common chips most LCDs use and they all have a couple different timing requirements for the first couple bytes. I haven't worked with Arduino so I'm not sure if that is built in to the libraries or not.
At any rate... glad it works.