lcd displays random characters for sale

When I start my code, it displays as expected the initial screen on the LCD (as defined in setup() function) and then the temperature. But suddenly the LCD displays random characters, see attached, and somehow never stop displaying random characters until i restart the board.

Introduction：As we all know, though LCD and some other displays greatly enrich the man-machine interaction, they share a common weakness. When they are connected to a controller, multiple IOs will be occupied of the controller which has no so many outer ports. Also it restricts other functions of the controller.

Therefore, LCD1602 with an I2C port is developed to solve the problem. It is also simple to handle. It has only two bidirectional data lines, a serial data line and a serial clock one.How to wire:GND—GND; VCC—VCC; SDA—A4; SCL—A5Features:Voltage: 5V DC

3 feet: V0 LCD contrast adjustment end, then the positive power supply when the contrast is the weakest, the highest contrast when grounded power, the contrast is too high will have a "ghosting", when used by a 10K potentiometer to adjust the contrast.

Many of these LCD controllers differ slightly from the HD44780 controller in things like the initialization sequence, minimum delay between commands and maybe other ways I don"t know of.

try putting a 1n4148 diode between the 5V supply and the 5V of the LCD, so the LCD will get around 4.5V, that is enough for the LCD, and lowers its logical input levels enough so that it sees 3V3 logic highs as "1" reliably. The garbled letters, and blocks are due to the LCD sometimes seeing a "1" as a zero and that corrupts all communication between the PI and the LCD.

Its a well know problem when trying to drive an LCD with 3V3 levels, it actually needs minimally 3.5V when its powered with 5V (70 % of VCC = 0.7 x 5.0 = 3.5).

In the photos above the Pi is a Model B Rev 2 so should work fine with my tutorial. Random characters is usually a sign it has not been initialized correctly. Again this could be caused by intermittent connections.

I was having the same problem as the OP on my current build with an I2C back-packed LCD getting corrupted. I"d tried all kinds of things to fix the problems - changing the delays, trying different libraries, and pulling out hair with no joy in fixing it.

For anyone else with this problem, you may have what I have if you"re doing event-driven code e.g. from from a switch or rotary encoder. I was getting events triggered while the python code was trying to communicate with the LCD screen - which themselves tried to write to the LCD.

I also had the same problem with scrambled characters on my display. I found that there was a short between the data lines on the expander board where it is soldered to the display board. Once I cleaned up the messy solder, the display worked perfectly.

I"m trying to connect my LCD screen (16x02 QAPASS) to my PIC16F1937 on MPLAB, but it displays random characters (in this case Chinese characters, question marks and slash) instead of alphanumeric. However, all PIN connections have been declared in the library and correctly connected to the PIC. I use an XC8 compiler.

The global project is a sensor that detects the distance of an object and displays this same distance on the LCD. The fact that the LCD does not display the character compromises the rest of the project because I cannot set up the mathematical calculations if the LCD fails.

What to do when the controller displays random characters?The ATS controller may sometimes display random characters. In most cases, the transfer switch operation is not affected and the indicator lights may still show the correct status.

The main and auxiliary power can then be restored after confirming that the controller has been completely turned off for about 10 seconds. When off, the display backlight is dim and all the indicator lights are off. If the random characters do not go away after a controller reboot, the controller will need to be replaced.

Previous examples connect the white LED backlight to power. The following example is specifically for those using an LCD with a RGB LED backlight. The only difference between the connection is the LED"s backlight on pins 15-18.

My LCD is showing random characters, see the picture below (the last character blinks, some characters change and over time there are slowly more and more characters). I"m starting to wonder if the LCD I chose has a driver compatible with the LiquidCrystal library, what do you think? If so what can I do to avoid buying another one?

I was trying to implement a circular buffer using UART. In the testing stage I simply output an ASCII character("a") inside infinite while loop. It was working fine till I disconnected the power supply and turned it ON again(about 30 secs delay). At this point of time some random character started appearing on the screen instead of ASCII "a". We need to press reset switch every time after each power ON cycle to print the characters properly. Instead of using Direct Register Access program model I tested with some Tivaware examples. It didn"t solve the problem. An interesting thing to be noted here is that it happens only with 9600 baudrate. When I changed the baudrate from 9600 to 115200, the code started printing characters as expected (It only created problem at the very first power on cycle which is acceptable). From PC side I am configuring it for 9600 8-N-1. I tried PuTTy, teraterm, hyperterminal and arduino serial monitor with no success (teratern even refused to print those characters). When I repeated the experiment with Arduino IDE and Arduino UNO, it worked perfectly fine with all softwares. This behavior is so random in nature ie if I don"t give more than a couple of seconds delay between power ON and OFF the problem doesn"t come. I have discussed a similar problem in the following thread but at that point of time putting a delay between UART init and infinite while loop solved the problem.

As soon as I press the power button on my Dell Inspiron 8600 Pentium M laptop and the LCD screen turns on, there are random characters all over the screen while the BIOS is starting up (square roots, boxes, other misc characters and shapes) however you can still see the BIOS. once the XP login screen loads all of the misc characters go away there are all of these small boxes in patterns making the screen very distorted. you can still see the home screen (i was able to copy/paste all of my files onto a WD Passport drive). it briefly went away for 10 mins then came back and it"s been like this all day (see picture above). so i"m stuck with this problem now and i"m trying to figure out what is dying:

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This tutorial shows how to use the I2C LCD (Liquid Crystal Display) with the ESP32 using Arduino IDE. We’ll show you how to wire the display, install the library and try sample code to write text on the LCD: static text, and scroll long messages. You can also use this guide with the ESP8266.

Additionally, it comes with a built-in potentiometer you can use to adjust the contrast between the background and the characters on the LCD. On a “regular” LCD you need to add a potentiometer to the circuit to adjust the contrast.

Before displaying text on the LCD, you need to find the LCD I2C address. With the LCD properly wired to the ESP32, upload the following I2C Scanner sketch.

Displaying static text on the LCD is very simple. All you have to do is select where you want the characters to be displayed on the screen, and then send the message to the display.

The next two lines set the number of columns and rows of your LCD display. If you’re using a display with another size, you should modify those variables.

Scrolling text on the LCD is specially useful when you want to display messages longer than 16 characters. The library comes with built-in functions that allows you to scroll text. However, many people experience problems with those functions because:

In a 16×2 LCD there are 32 blocks where you can display characters. Each block is made out of 5×8 tiny pixels. You can display custom characters by defining the state of each tiny pixel. For that, you can create a byte variable to hold  the state of each pixel.

In summary, in this tutorial we’ve shown you how to use an I2C LCD display with the ESP32/ESP8266 with Arduino IDE: how to display static text, scrolling text and custom characters. This tutorial also works with the Arduino board, you just need to change the pin assignment to use the Arduino I2C pins.

4. If the customer is having difficulty reading the information displayed on the LCD or its too light, try changing the contrast setting. Adjusting the contrast will give the LCD a sharper and more vivid appearance.