Hey guys thanks in advance for any help. Extreme newbie here,
Im trying to use this 16x4 lcd using 16x2 example code.
Hello world is all jumbled up with nonsense. Im obviously doing something very wrong.
Here is link to lcd:
http://www.allelectronics.com/make-a-store/item/lcd-164/16-x-4-alphanumeric-lcd/1.html
Pic of code
Seasea19:
Pic of code
Your code is too faint to read. Perhaps you could try pressing the keys a bit harder.
Try checking your four data lines. My guess is that you have a problem with one or more of them.
Be aware that there is a problem with how the LiquidCrystal library deals with the cursor positioning on lines 3 and 4 of the 16x4 display. They may get it fixed in a future release, possibly before 2020.
Don
floresta:
Your code is too faint to read. Perhaps you could try pressing the keys a bit harder.
I like that!
A frequent problem we see here is that someone has failed to solder the connections to the LCD PCB and has just sat a pin header in the holes.
If this happens to be the case, clearly the first thing is to solder the pins to the PCB. If you have not done this, we can not assist you.
It does appear that you have a bad connection on one or more of the data lines.
Haha! You caught me, the pins are laying in the holes. Ill fix it tonight. So can i use the 16x2 code to run this 16x4? Are there any conflicts?
The picture of the code is too large to post but its the same as the "hello world example".
Thanks!
So can i use the 16x2 code to run this 16x4?
You can run it with no problems except that, without some minimal additional code, the characters on the last two lines will be indented by several positions.
Don
Edit: Check this out: --> LCD 16x4 setCursor is not working right - Interfacing - Arduino Forum
Note: That thread is nearly six years old, hence my comment about 2020.
Well, i soldered everything on both 16x2 and 16x4, still nothing. I did briefly see hello world in the 16x2 and then it faded away. The 16x4 just scrolls through all the characters. Im thinking of ordering one from sparkfun or another credited site becuase ive got these all screwed up.
We still haven't seen your code.
The picture of the code is too large to post but its the same as the "hello world example".
There's no 'picture' involved. Copy the code from your Arduino IDE screen and paste it into your message reply. Then highlight that code and click on the 'code' button </>.
Don
LiquidCrystal lcd(12, 11, 5, 4, 3, 2);
void setup() {
// set up the LCD's number of columns and rows:
lcd.begin(16, 4);
// 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);
}
Its just copied and pasted bc I dont have internet at home.
I have a felling that the 16x2 has either a signal problem or I damaged it somehow while learning how to hook it up. I have examined this circuit over 3 different days and it has clean solder joints.
I fell like the 16x4 is not compatable somehow. The contrast works and it displays, it just scrolls through all its characters.
Try the following code with both devices. You can (but don't have to) change the lcd.begin(...); statement since we aren't trying to position the cursor.
#include <LiquidCrystal.h>
//LiquidCrystal lcd(rs,en,d4,d5,d6,d7);
LiquidCrystal lcd(12, 11, 5, 4, 3, 2); // put your pin numbers here
void setup()
{
lcd.begin(20, 4); // put your LCD parameters here
for (char i=47; i<127; i++) // send 80 consecutive displayable characters to the LCD
{
lcd.print(i);
delay(100); // this delay allows you to observe the addressing sequence
}
}
void loop()
{
}
Don
P.S. Do you see what the 'code tags do? Here's the same code without them:
#include <LiquidCrystal.h>
//LiquidCrystal lcd(rs,en,d4,d5,d6,d7);
LiquidCrystal lcd(12, 11, 5, 4, 3, 2); // put your pin numbers here
void setup()
{
lcd.begin(20, 4); // put your LCD parameters here
for (char i=47; i<127; i++) // send 80 consecutive displayable characters to the LCD
{
lcd.print(i);
delay(100); // this delay allows you to observe the addressing sequence
}
}
void loop()
{
}
Wow thank you soo much! It worked!
It printed perfectly.
So how should i wrap my head around this? Is there something im still missing for the normal code to operate?
Im assuming this is a manual way to print the screen?
Fyi, this is a weather station that will display wind and temps...hopefully.
All that code did was verify that your device is connected properly and is functioning properly. This means that the strange results you previously had were likely based on the program code, not on the hardware.
I would suggest that you try this program next with your 16x2 display:
include <LiquidCrystal.h>
//LiquidCrystal lcd(RS, E, D4, D5, D6, D7);
LiquidCrystal lcd(7, 8, 9, 10, 11, 12); // put your pin numbers here
void setup()
{
lcd.begin(16, 2); // put your LCD parameters here
lcd.print("hello, world!");
lcd.setCursor(0,1);
lcd.print("it works!");
}
void loop()
{
}
For your 16x4 display change the lcd.begin(...) statement and add the following code to setup()
lcd.setCursor(0,2);
lcd.print("this is line 3");
lcd.setCursor(0,3);
lcd.print("this is line 4");
You should see lines 3 and 4 offset by a few characters for the reasons I mentioned previously and with the fix in my previous link.
When all this works then try the liquid crystal 'hello world' example code again.
Don
Ok so for the 16x2 i def fried it. I must if messed it up trying to figure out backlight.
For the 16x4 see the pic attached. Looks like the lines are correct it just printing nonsense.
Here is pic
I can't figure out how it could work properly for the code in reply #10 and then give the results shown in your image with the code in reply #12.
We need to see a clear picture of the entire setup where we can unambiguously follow each wire from one end to the other and also see the output on the display. We also need a copy and paste version of the code that resulted in the display in the photo.
Don
Well here is the pic of setup the best i could do. Sorry for using all blue jumpers.
I have D0-D3 soldered but are not in use.
Pin 3 is going to wiper on pot.
Pin 5 R/W is going to ground.
All others should be assigned correctly as code states.
Once i get internet to laptop ill post entire code.
Thank yall so much for any help!
Seasea19:
Well here is the pic of setup the best I could do.
You're kidding!
Take it outside in daylight, find a digital camera, hold it at least a meter away vertically and use the zoom.