[PROBLEM SOLVED] LCD Keypad Shield Not Displaying Words -ARDUINO UNO - DFROBOT
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- Опубликовано: 11 сен 2024
- Do you ever facing LCD keypad shield issue with only white screen displayed?
Found 2 possible cause for this issue
1) Do make sure your potentiometer is correctly adjust.
2) Do make sure all the pin legs are attached to your arduino UNO.
3) Do make sure the back of the LCD keypad shield is not contacting the arduino uno
Thank you :)
Youre a god , searching the internet for a solutions for hours by now. YOU ARE A MULTI GENERATIONAL SVAIOUR!!!!!!!
You have elevated yourself to "Master of THE Universe", this has been bugging me for weeks!!!!
thank you! hope it make your day
God dammit! Give this man a price.
MVP!!!
I've been troubleshooting this damn thing for ages now. Turns out, I'd put my Arduino in a case, which apparrently made it impossible for the LCD contacts to connect properly.
Dude, NEVER take this video offline. THANKS!
I almost got sad that I got a non-working shield and turns out it's so simple. Thanks!
Wow I was trying to figure out why my displaying wasn't working and your video explained the problem and now I can actually use my display! Thanks!
Thank you so much. Your simple video tutorial has saved me throwing away a good LCD display.
Awesome! I was just about to de-solder the LCD screen to try the one I know is working.....I didn't realize there was so much adjustment available with the potentiometer and had already tried it a few rotations.... Thanks for the fix!
no problem bro, i was thinking to get another one as i thought this unit is defect...lucky i manage to make it work
Thank you very much. i was trying for 4 hours and even turned the knob before but i didn't know it had to be turned so much. i thought my shield was broken and was about to try removing the lcd from it. i subscribed!
Thanks, I had ordered a couple of these for my classroom and I first thought they were defective. Lile so many others in the comments, I tried a little adjustment and nothing happened.
I then kept just turning clockwise until I saw the display start working.
Here is my question, why don't they fix this before shipping?
i believe they don't even know this is an issue haha
You are a life saver. Huge thanks, had to make like 10 turns for the text to display!
Thanks you solved my problem brother..... great....
Thanks, just save me from destroying the Keypad lcd!!
You are a saviour mate !!
Thank the gods , instant migraine relief 💯
many many thanks for this tips.
I don't understand why the manufacturer sent me 5 LCD shields with contrast set to minimum so that I wasn't able to see any text. your solution fixed it
Thank you so match !!!!...you making may day.
10X u for this great video. I was a problem solving 4 me, i just killing myself with this display and ...THANK YOU!
It worked. thank you!
dude! you're a life saver! thanky ou so much from mexico!
you are welcome! keep it up too
oh gods, it works. thank you very much!!🤗
Thank you so much. I was about to buy more hardware because nothing worked to improve.
Problem solved. Thank you bro.
thank you bro. now i know my shield is working.i just adjusted the potentiometer :)
Thanks man you save my day. Love from India ❤️❤️❤️
Thank you! I have been seraching for ages and the solution being so simple frustrates me a bit.
just give me a thumbs up for the hardwork :P
Thanks, works great!
Thank you so much man!
Thanku very much bro it helped me a lot❤️❤️
It works. Thank you!
You are a LEGEND my guy!!
Man, you really help me. Thank you
I too was going for a replacement thinking it isn't working. Well thanks brother you solved my prob. (y)
Md. Farhan Naseh welcome bro!;)
OMG simple fix and no other video like it on youtube
Thank you for helping me out. never thought to adjust that far. thanks for sharing.
Thank you !!! I was turning the poto, but not enough times... Nice to have troubleshoot video.
Lucky you did not threw it away LOL. Good to hear that he comes alive :)
Damn man, thanks, this helped a ton
Thanks this works for me
Thanks for sharing your experience brother.
worked, thanks :)
This one is really helpful! Thx a lot!
thank you so much brother
Thank you! It's working!
THANK YOU SOOOOOOOO MUCH!!!! IM AN IDIOT AND YOU SOLVED MY PROBLEM!!!!!
tHANKS FOR YOUR EFFORT. im not able to display something. your video help me to get output...
It may be a USB power noise problem, add a capacitor 0.1uF (104) or 1uF (105) between the LCD pins A,K may solved the problem, my case working fine.
Thank you, you solved my potentiometer problem!
THANK YOU
Thanx bro , you saved my 5$
muchisimas gracias
very nice! thank you!
Thanks!!! I had the same problem.
Thank you Sir! I was trying everything to get the display to work but didn't think to turn the pot knob so many times.
thank you so much for the video. saved my project
Te pasaste man, me salvaste ya había pensado que estaba quemado xd
my d1 robot lcd still cant displaying,, whats the problem,,?
Awesome , thanks
thanks! it was the potenciometer!
welcome :)
thank you so much! it worked
Thanks a lot 😍😍😍😘😘
thanks u so much yar.......
lmaoo I thought my LCD was broken lol
Thanks!
Hello my brother, I have a problem with the Right bottom, if I press the Right button my Arduino reset.
Hi guys, the problem is a cut circuit in the board, I buyed a new board and the problem fixed. This is the problem of buy on chinese store
Brother untill know no solution I geted
Hola Profe, resulta que todo va bien en mi proyecto, tengo conectada una bomba y una termorresistencia, sin embargo de vez en cuando la LCD se Corrompe, es decir se borra el mensaje y empieza a mostrar solo caracteres, el sistema sigue funcionando al parecer controla bien pero la imagen se pierde y muestra solo caracteres, que puedo hacer?
JUST TO UPDATE THIS AND TO GIVE A MORE THOROUGH EXPLANATION FOR ALL OTHERS HAVING THIS PROBLEM
I had this problem, i literally just posted for help and as fate would have it ... i fucking worked out of LOL
4 Days of troubleshooting......... Why wouldn't i figure out the problem just after posting for help LOL
anyway ... Strap yourself in, LET'S DO SOME TROUBLESHOOTING
(this problem and troubleshooting is specific to me) and goes beyond the video
MY HARDWARE
The Arduino Approved (as per the video) 1602 LCD Shield
Arduino MEGA
Arduino UNO
7 other various LCD Displays (only display)
i was able to connect all the other displays to both Arduino's without a problem and only this one gave me grief
HERE IS WHAT I LEARNED
1. The red Power light is Normal and does not indicate an error
(FUCKING STUPID TO USE RED AS A NORMAL LIGHT in my opinion, Why not use Green)
2. My board had a short on it
TROUBLESHOOTING
1. Basic electronics troubleshooting
2. Basic Arduino shield assembly procedure
3. Watched this video
4. Watched another video with this instruction...
==============================================================
I guess it’s time for me to re-introduce my generic step-by-step approach.
(1) If the module has a backlight then get it working properly.
This involves only pins 15 and 16 on most LCD modules.
Make sure to use a current limiting resistor if there is none on the LCD module.
(2) Get the power and contrast working properly. This involves only pins 1, 2, and 3 on most LCD modules.
You should be able to just barely see blocks on one row of a two row display
and on two rows of a four row display.
NOTE: The Arduino has not been used yet, except as a possible source for the power needed for the first two steps.
Do not try to go any further until this is working. If you don’t see the blocks then no amount of program code will help.
(3) Connect the LCD R/W pin (pin 5) to GND.
(4) Connect the six control and data wires between your LCD module and your Arduino. Make sure that your wiring matches the numbers in the descriptor (or vice versa).
======================================================================
- i discovered that you can only insert the shield one way because the distance between the pins ON THE ARDUINO between Vin and A0 is 4.3mm
and the distance on the other side between pins Digital 7 and Digital 8 is 3mm
SO.... MAKES SURE YOU HAVE INSERTED THE SHIELD WITH ALL PINS LINING UP CORRECTLY
i did so, i was still having the problem
- My other problem was sketches would not load
- My other problem was the potentiometer was not reacting to any movement or turning
- I tested the pot with a multimeter DIRECTLY FROM THE PINS on the pot
Pot was working fine, so something shorted somewhere
- Separated shield from Arduino, Connected shield with jumper wires
only GND and 5V DC Connected to A and K
Same thing... Screen lights up, i get the characters , but can't load sketches
- Tried on both boards, Same result
- Examined board with a magnifier
FOUND DIRTY CONTACTS BETWEEN SOLDER JOINTS (this is a brand new shield)
- Got Isopropyl Cleaner and non static brush
CLEANED THE BOARD
- THE POT WAS NOW WORKING
- SKETCHES WERE NOW LOADING (i could tell by the light flashing)
HOWEVER IT STILL WASN'T WORKING
no ASCII Characters on screen
I DID THIS
Step 1. Open new sketch (to clear the arduino memory)
it should be this
==========================================
void setup() {
// put your setup code here, to run once:
}
void loop() {
// put your main code here, to run repeatedly:
}
==========================================
Step 2. Upload to your arduino
YOU SHOULD GET 1 COMPLETE LINE OF CHARACTERS
NOTE : "A Character" is defined as 1 Rectangle of 5 x 8 Pixels.
what a lamen might call "A SQUARE" but it's not a square
if you have the line of character boxes
And your backlight works
YOU ARE READY TO UPLOAD THE SKETCH
Step 3.
OPEN ARDUINO IDE (if it isn't already)
Select EXAMPLES/LIQUID CRYSTAL/AUTOSCROLL
The default sketch will have a line of code you need to pay attention to
IT LOOKS LIKE THIS
==========================================
44 // initialize the library by associating any needed LCD interface pin
45 // with the arduino pin number it is connected to
46 const int rs = 12, en = 11, d4 = 5, d5 = 4, d6 = 3, d7 = 2;
47 LiquidCrystal lcd(rs, en, d4, d5, d6, d7);
==========================================
STEP 4 - THE SOLUTION
CHANGE LINE 46 TO READ AS FOLLOWS
==========================================
46 const int rs = 8, en = 9, d4 = 4, d5 = 5, d6 = 6, d7 = 7;
==========================================
Compile it
LOAD IT
you should see numbers scrolling
NOW....
ALL YOU NEED TO DO IS LOAD ANY CODE BUT UNDERSTAND
RS = Digital 8
EN = Digital 9
Digital 4 = Digital 4
Digital 5 = Digital 5
Digital 6 = Digital 6
Digital 7 = Digital 7
thats it
IN MY CASE
I had a dirty shield with shorts on the board.
the pin assignment was incorrect
and i thought the red light indicated an error
HOPE THIS HELPS
Oh also
if you're wondering why in the video he presses on the screen.
well... there are little Pink and black rubber supports that hold your screen
THIS RUBBER IS CONDUCTIVE AND LITERALLY FORMS CONTACTS WITH THE SCREEN MATRIX AND THE BOARD
SOMETIMES THE CONTACTS COME LOOSE, Nothing more than that
I still have the blocks on the top row even with no LCD related sketch installed ... does this mean it is broken?
Brendon Boam check ur code as well, normally it is because of wrong pin
thanks... it was the potentiometer.
i work in lcd 1602 display only and i made a program with arduino with 4 buttons to make input in A0. but the display of the lcd from the start is ok but when i press the buttons it converts into blanks
Double check ur code output again.. most probably it was not properly configured
@@hobbybuild35 i chcked it sveral times and it worked but for sometimes and sometimes not. i don't know . could i send the code to you to check
Hi,
This is not the problem that I am having. My problem is that not all of the buttons are working and some are not correct. For example pressing left, displays "Down" on the LCD. Also pressing the down button displays "Up" on the screen. Can you please post the button values that you are using in you sketch? Thanks! Also, what version of the LCD button shield are you using? There are several versions, and each uses different values to detect button presses? The versions are: v0.1, v1.0 & v1.1 (the one that I have).
Thanks for your help,
Ken
www.dfrobot.com/wiki/index.php/LCD_KeyPad_Shield_For_Arduino_SKU:_DFR0009
Hope this can help you with dfrobot shield setup.
thank you! i thought my LCD shield was dead on arrival.
lol I fought with store store manager because of this...
THANK YOU VERY MUCH BRO! What the fuck we need 'press slightly all area? and how come none of arduino videos are ever mentioned this?
This is my addition solution in case, someone's arduino still not working out.
At first, I cover my arduino with the perspex case. It still went wrong even after I pressed it.
But later I realized, the pin legs of the LCD wasn't connected properly enough to the arduino.
So, everyone out there, please unscrew and don't use the case.
that's why i decided to make a video out, i believe many of them throw off the entire shield and mark it as defect.
too bad to those who did that before watching your video. I almost buy another one. TQ.
I spent hours turning that pot. Finally i found the right side (right)
turn potentiometer 20 times clockwise and got it
thank u
working !!
U save meeeeee aa looootttttttttttsss
Btw god bless u
When the code is uploaded the screen goesvdark?
thanks
i get boxes but still nothing else try to press on screen but ...
boxes means ur contrast is too high, try to lower it down ..
How to do that brother?
V Viners potentiometer
arduino is so stupid too many problem i got problem on usbhostshield and now with the LCD keypad i got only boxes but no text ....
yow bro, check your code there, either the code or the soldering is really bad
I've tried everything still my LCD shield is not working, it just shows blue screen no boxes or anything, tried adjusting the potentiometer still nothing is displayed on screen
same here, i have had this issue for weeks. Have you found the issue?
Me too. Have you already found the issue? can u tell me how to solve it?
have u solve it already? can you tell me how to solve it?
yes I have found the issue turns out that the potentiometer on the device was faulty so i replaced it with a new one
ohh i see. thank you
Boxes is not going plz help
can u share the program?🥺
Bro you can use the default code to test it out. It is in the sample
Hello, i have the same Problem with lcd Keypad Shield . How can i fix it?
Please help!!
just follow the steps :)
it is same if i used arduino mega instead of uno? how to do that?
i am not sure about this, but if arduino mega support the keypad shield, this will work like a charm.
do u know how to do if my LCD Shield power's light does not light up?
just make sure the input power leg is right on the arduino mega's power output socket
i still cannot display my lcd and it always get boxes and blank. i had adjust the potentiometer but it comes boxes and blank too
Nur Azni Shahira Mohd Sanusi try to turn the potentiometer more to make the display, if adjust doesn't work, please make sure all the legs are fit into the socket
Other thing is to check the pin used in ur code, sometime ur pin configuration. Need to change accordinglu
No work for me..!!🤕😩
Thank you very much ! It's been really helpful !
Muchas gracias
Thanks!