nounours18200

I would like but, sorry, I see no potentiometer on the back ? where is it located ? I also tried it, and the result is the same: Of course I agree, but it seems to me that it is what I have done : I have copy/paste the "LiquidCrystal_I2Cw2.h"...

This fixed the problem on Arduino 1.8.19, but still doesn't work under PlatformIO, here is the compilation report: Executing task in folder I2C_T4_Helloworld_wire2: C:\Users\ordic\.platformio\penv\Scripts\platformio.exe run Processing teensy40...

I order another LCD and will use the same backboard than you. There are 2 variants of LCD: 3V3 or 5V. I assume that the power supply of the LCD must be 3V3 or 5V respectively. But what about SDA and SCL : is it possible to have SDA-SCL connected...

I have tested following your guidelines, SDA&SCL not connected: -The LCD powered with 3V3: same than before, i.e. the backlight is OK but no digits at all: -The LCD powered with 5V, SDA&SCL not connected, the result is exactly the same: the...

Yes I understand. I have already changed the I2C cable, so I can separate SDA&SCL from the two other power supply wires, as shown on the photo herebelow: OK, I will use PlatformIO with the program known to work and come back to you in a few...

Yes: when powered with 3V3 the I2C scanner program reports a device found at address 0x27. The LCD displays the backlight in white, but no characters are displayed if I use the program above. Only the backlight is active, no blank digits at all...

Here is a zoom on the PCB I2C connector: From Left to right the PCB connector shows: SDA (Blue), SCL (Yellow), GND (Black), 3V3 (Red). Unless I am wrong, the color match with the backboard of the LCD.

I have ordered a 3V3 version: is there a way to check that they have not sent a 5V version ? You are probably right: I thought about the same because on the "buydisplay.com" website, amm the examples use the LiquidCrystal_I2C library. I had been...

Thank you guys for all your incredible help ! I must to leave my house until this evening (I apologize for that), so I post a full reply tonight, but meantime here is the buydisplay.com LCD (3V3) that I have bought from Aliexpress (it seems that...

Here is a photo of the LCD, it is a "buydisplay" LCD but bought on Aliexpress: it arrived in a "buydisplay.com" parcel and looks authentic. The backboard is this one: https://fr.aliexpress.com/item/1005003270817900.html I have other possible I2C...

Well i have uploaded the program into the T4 located on my motherboard, and the probleme is still the same: no display. Here is the PlatfomIO upload report: and here is the photo of the T4 with no display: The LCD backlight is turned on but...

Thank you very much BriComp: it seems to be what I needed. The purpose of my test program (herebelow) is to check what happens when the cursor goes over the length of the LCD row. For ex, I use a 2x24 display, and I need to know what happens if...

The screen is a "buydisplay.com" 24x2, using a hd44780 chip (see attached file) with a I2C backboard. It is correctly detected at 0x27 by an I2C scanner. I use the hd44780 library , just trying to display anything to check that it works, but it...

I don't know if this teensy4_i2c.h library available from here: https://github.com/Richard-Gemmell/teensy4_i2c is a solution to use wire2 ? It seems that it can replace the usual wire library. Thank you

Hello, I work on a project using Teensy 4.0 and a LCD screen (its address is 0x27) that should be connected via I2C on the wire2 pins, i.e. pin 24 (SCL2) and pin 25 (SDA2). The regular I2C pins (pin 18 for SDA0 and pin19 for SCL0) are used for...

Thank you jmarsh: very useful information ! I was in the process of designing the PCB of the motherboard; I try to use the Teensy 4.0 because of the very limited available space in the original device... It seems that I can link all the necessary...

I agree. No need to change the circuitry: the motherboard and program will be designed only for this project. I am also (like you) a bit concerned with the "response delay" in case I use a not powerful µC: so I will use a Teensy 4.x to get the...

Hi Paul, This is what I suspected, so I will go to the 74LCX125. But before going in the "hard part" of the program and motherboard PCB design, I would like to have your viewpoint on an approach that has been proposed by a friend of mine, and...

I agree that it can be a little "cloudy" !... The purpose is to replace the very old VFD display of a device by a modern LCD display. The old VFD display is almost impossible to find (used it costs >1.000€ ....) and the available space for the...

If I understand what you mean, you assume that T1=60ns , don't you ? it should be OK, but it is not 100% sure, unless I am wrong ? This parallel interface comes from a device and goes to a (very old) VFD screen display. The VFD display has its...

Hi, I usually program on Arduino, but this time I have a task than cannot be achieved by an Arduino, because it requires a much more quicker processor than any Arduino. I have to read 8 lines of a parallel interface, and (according to the...