arduino lcd panel kullan谋m谋 brands

I put it to clear a certain part of the lcd where the millisecond counter is. It never cleared. When i replaced the lcd.print(""); with lcd.print("."); it displayed an period where I wanted the nothing.

I"m very new to Arduino, but not to electronics (which I"ve been doing for 30+ years). I"ve been working from the book Beginning Arduino by Michael McRoberts and I"ve had very few problems so far. I"ve just started the chapter on LCD displays and I"m trying the Basic LCD Control project. I am using a brand new display that I bought from Rapid Electronics (UK):

Winstar - WH1602B-YYH-JT - Winstar WH1602B-YYH-JT 16x2 LCD Display Yellow/green LED Backlight - A 16 x 2 LCD display that has a transflective type 6 o"clock

I had to solder a header to it to use it on a breadboard. I took ESD precautions and I"ve tested that there are no shorts and that all pins are connected OK. The thing is, when I try out the program, absolutely nothing happens - the backlight doesn"t even come on. I am aware of errors both in the book diagram (where R/W is not connected to GND) and in the program which showed a compile error initially, but I found a fix on this forum. I have checked the connections and code over and over again, but with no mistakes found. I"ve checked that everything that should be at 0V/+5V actually is. I"ve even checked that all of my Arduino digital pins are still working using a simple LED flash program.

I am using the 4x20 i2c display in my arduino uno brewery project. I am using 6 digital outs as relay channels to the sainsmart 8-relay board, 2 digital outs to run some heavy SSRs, have a piggy-backed RTD temperature sensor shield, and the lcd display module. Initially, I was trying to run everything over usb power and appeared to be getting too much voltage drop, so I added a 7.4V 1.8A power supply with a 7805 regulator. That brightened up my display and seemed to eliminate the voltage drops. I now have 5.06V dropping to around 5.04V with many of the relays on. As an additional debugging step, I added 4.7uf caps to both sides of the 7805. I"m still having issues where the lcd display is going blank (and won"t do anything with additional prints). I display 4 lines of data around once per second. By adding a bunch of extra delay()s in different places, it appears the lcd is going blank when I"m printing data to it. (Not while relays are switching, for example. BTW, they seem to be run by transistors and have diodes on them anyway). I have done everything I can to check the data, and have found nothing. I am padding my strings with spaces to 20 characters, ensuring that I have null termination, am verifying the return value of print is 20 and am checking each character passes isAscii(). If I do a begin() to reset the unit before each screen refresh, it will function without fail, but of course, that looks like crap. Has anyone had an issue similar to this?

This stems from the fact that the LCD controller itself does not inherently support the function and in fact treats the ASCII codes for and as displayable characters instead of control codes.

In my opinion the basic LiquidCrystal library should concentrate on implementing all of the capabilities of the LCD controller and no more. If people want a library that more closely emulates a CRT (or LCD) terminal that is fine, but I think it should be done in a different library.

Explanation: the glass of the lcd lays on the top and the bottom on a kind of "rubber" in which electrical lines are integrated to lead the signals from trhe pcb to the contacts of the lcd glass.

Good morning makers, I"m trying to use some old LCD screens, I"m using Arduino nano to control the display with the classical 4-bit configuration and the hello world sketch of the liquidCrystal library(I used also the one of newliquidCrystal library) but I can see only some black boxes on the right part of the screen.