lcd problem
sinanhalici opened this issue · 34 comments
is there any image on the LCD at idle standby or is it necessary to print a button?
There no standby mode in this project. When you turn of the engine BC is complacently torn off in order to save energy from car battery (in long term). The only way to turn it on is to turn the ignition key back to contact position.
Does the display appear on the screen without connect the 32-pin connector?
thanks a lot
22pin connector ...? (not 32)
No, fist you need to adjust contrast based to back light. You need to display something to do that.
If you change voltage supply, this need to be re-done again.
I have connected 2x16 lcd to arduino mega correctly without Mid bord, but there was nothing on the lcd.
In MID.h you will find
#define SCREEN 24064 // Glcd 240x64
//#define SCREEN 162 // lcd 16x2
comment #define SCREEN 24064 and uncomment SCREEN 162
16x2 LCD type is not used for a long time and may not work well as 240x64
I know those code.
I connect LCD to arduino mega correctly and connect arduino mega to computer without ArduinoMidboard, but LCD doesn't show me anything.
Should i connect 32 pins connector and turn on contact after connect 22 pins LCD connector?
Can you make clear test with simple display of "hello world" by using same pin connection described in MID.h for screen 162?
For ground connection use analogWrite(,0); and for 5v use analogWrite(,255); where is needed
Place those settings in void setup ()....
Basically this LCD was never used in current version.
You must wait several days to make a single test from my side :/
Can I connect the LCD on the arduino mid board as I show it with the red lines in the picture on the arduino mid board, or should I make a mixed connection?
For example 1 to 10, 2 to 8 ...
This is by default... LCD pin 1 goes to Arduino Mega 2560 pin 24 / LCD pin 2 to 25
but way you soldered a double sided male row from the wrong side ?
Thous male rows needs to be at the bottom side... to be connected to Arduino Mega 2560
You will need a two potentiometers for contrast (negative voltage) and back-light to calibrate LCD between connector and cable.
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Can we close this issue?
No
Can you wait for finished my circuit?
As you can see, the LCD has a male header. I am worried that the LCD will not fit directly on the Arduino.mid board.
directly No, with cable Yes
You will need around 1.5m with 22 pins if you will place it on my recommended place
Can you tell me how to connect with cables? I need to know from arduino mid board to lcd.
I connected the LCD, there is a blue light on the LCD screen, but there is no image or text. Do I need to connect the 32 pin connector to get the image on screen and do I need to connect arduino.mid board + 14 volts?
Like i was saying several times .... You need two potentiometers to calibrate contrast.
Check wiring of 240x64:
https://easyeda.com/fire1.a.zaprianov/MID_LCD_240x64-eee21a1e00ac4a4da848eed4253e9cf7
LCD will run only with usb power.
Place those trimmers closes to ArduinoMid board in order to have acces to them when some changes are made .
When you place Arduino in car also need to be re-calibrated the contrast.
Thanks for your help, but i mean can i see something on the lcd without connecting 32 pins connector?
I did calibrate, but there is nothing on the lcd. There is only lcd light when i connect usb cable.
Yes, without 32pin connector will show everything only data will be zeroed (junk) ... Also without a board will display ...
Try rearrange pins for display from MID.h or try other sketch only for testing is display OK
Since you have back light... Contrast is missing
To verify this by lowering the value of SCREEN_DEF_LIGHT
Can you take a video how to connect and conrast lcd?
Impossible... Already installed into car, but you can check this video
https://youtu.be/l0ADfGnYSZ8
There are same just pin number are different
Do you have any lines appearing over the display at beginning, when powering On?
I forgot to mention... When adjust the contrast... Rotate backlight and contrast potentiometers at some random point letters will start to appears.
You must adjust very carefully.
At maximum contrast full screens needs to be bright, do you have such a point? Check negative voltage is OK....
actually, we can't understand each other from here.
I don't have any problem to contrast 16x2 LCD. My problem is about 240x64 lcd's connecting and contrast.
in your Picture below the link, how can i give -12v?
I check with multimeter to 20. and pin, but there is no -12 V?
Should i connect different voltage suply for -12V for 20. pin?
https://easyeda.com/fire1.a.zaprianov/MID_LCD_240x64-eee21a1e00ac4a4da848eed4253e9cf7
In general there must be -12v power supply over pin 20 (or some other pin) ( this is for newer type)
Can you give me you datasheet of display...
I can't do contrast, so that there is nothing on the LCD.
please, help me...
It's back of my LCD.
Something is wrong with display.. on scheme pin 20 is voltage OUT... Must be -12v
Disconnect all pins and make test only with power supply pins
You need negative voltage over pin 20
Can you send me a picture or catalog of your LCD?
Maybe, I must give voltage from CN2 or CN3 from back of LCD.
There is -0,45 Volt on the 20. pin
Hmmm this is something... Don't use other pads. Check for shorts
This is my display
https://www.buydisplay.com/download/manual/ERM24064-1_Series_Datasheet.pdf
Yours is 24064-1 series, mine is 24064-2 series. There is something differenf between yours and mine.
I think there must be a solition, but how?
Ask supplier
This display had an unsupported controller
Hi.
Are all resistors, capacitors, and diodes listed listed soldered to the MID_PCB_V1.6.2 board, or are there components that are discarded?
Which capacitors are ceramic and which are electrolytic?
PCB_ gerber.zip