#Arduino mega pinout i2c how to#
#Arduino mega pinout i2c install#
#Arduino mega pinout i2c serial#

If you have it working on UNO, then it should work on Mega with no changes. That works with the older library by Malpartida on the Uno I know my pin numbers for the backpack, they are 2,1,4,5,6,7,3. you can't have more than library that has a LiquidCrystal_I2C.h header file installed

#Arduino mega pinout i2c install#

So when you install another library you must make sure to remove any previous library. They cannot coexist and can step on each other toĬreate an environment where nothing works or things behave strangelyīecause you can end getting parts of one library and parts of another.

make sure that one and only one of the libraries is installed a time.īecause of the way the IDE works and the naming used by the libraries,.

(see the Downloading and Installation section) What I can say is that I recommend using fm's library, as I know that one works.įollow the instructions and install it properly: In the MANY threads like this, the outcome is almost always the same: user error. Some work better than others, and sometimes vendors go in and monkey with stuffįor their hardware and sometimes break things. As can be seen, they are not all the same. wait a bit for the entire message to arrive

#Arduino mega pinout i2c serial#

when characters arrive over the serial port. Void loop() /*-( LOOP: RUNS CONSTANTLY )-*/ Lcd.setCursor(3,0) //Start at character 3 on line 0 Lcd.backlight() //Backlight ON if under program control set the LCD address to 0x27 for a 20 chars 4 line display I guess it is just possible that Malpartida, Dinoxxx, and Loser, have also been fiddling when they shouldn't, so, as a last resort, I guess you could get this library from, as I don't believe it should matter which library you use. I imagine the first step is to re-install the libraries virgo intacto, it could even be the only step. In short, your libraries are probably innocent, and your problem lies somewhere else. I submit your problem is too much concern about buzzstuff like parameters and functions, not to mention your limited C++ skills, where in truth you don't need any C++ skills at all, and you are not using the library in the manner intended i.e. The library is produced by YWRobot and was probably obtained from a link on the eBay page when I got the display. After all, what is there to change? It is just a matter of connecting the SDA,SCL as appropriate. As I said, I2C is I2C, and this is exactly what you would expect. OK, the following works without changing anything on both Uno and Mega. I just want a LCD library that works with I2C backpacks (the cheap no-name chinese ones) and that works on a Mega 2560.

#Arduino mega pinout i2c how to#

Version 3 by Löser does not include updated examples to show how to call it.My skills are not good enough to trace it out further within his code. I admit my C++ skills are not the greatest, but the error sounds like I am not sending the correct parameters to the begin() function, yet I'm pretty sure I am calling it correctly.Yes, I'm passing it 3 (or 2) unsigned 8-bit integers. Whether I use 3 parameters, or just 2, I get error: no 'void LiquidCrystal_I2C::begin3(uint8_t, uint8_t, uint8_t)' member function declared in class 'LiquidCrystal_I2C' when I compile.(It also takes the # of cols and rows again - redundant!)

The begin() function now has a 3rd parameter, which is the dot size of the display.

The default is 'POLLIN' but I think the correct one for my pinout is 'SYDZ'.

The constructor now takes the address, cols and rows, and one more parameter, a constant, that indicates which backpack you are using and it's pinout.

The constructor and begin() parameters have changed.

It was last updated 8 months ago on 8/14/13 by Sebastian Löser.

I found LiquidCrystal_I2C_V3 on GitHub.

That works with the older library by Malpartida on the Uno.

I know my pin numbers for the backpack, they are 2,1,4,5,6,7,3.

My file date is 4/5/12 but I think that may be the date I unzipped it.

The LiquidCrystal_I2C library that works on the Unos was created by Francisco Malpartida on 8/20/11 according to the comments in the file.

I'm using pins 20 SCL and 21 SDA on the Mega.

The Mega is thus verified to send and receive via I2C.

I can run I2Cmaster and I2Cslave on the Uno, the Mega, and the Launchpad, and whichever way I load 'em and run 'em, they all talk to each other as expected.

I can run I2C scanner on all boards and find the display at address 0x27.

I can get all 3 displays working on both Unos and the Launchpad, but not the Mega.

I have 2 Arduino Unos, a Funduino Mega 2560, and a TI Launchpad.

I have 3 LCD displays with I2C backpacks.

I've found a newer library, but the parameters were changed around and I can't get it to compile. I've done a lot of troubleshooting and at this point I'm convinced the problem is in the library. I am having trouble getting a 20x4 LCD display with a I2C backpack to work on my Fundino Mega 2560.