HD44780 LCD with Arduino Uno

Help archive
1

Hello,

I am trying to interface HD44780 LCD with Arduino Uno.

All the connections are done as per https://github.com/RIOT-OS/RIOT/tree/master/tests/driver_hd44780

Below is my code:

The code is compiled successfully but does not work as expected on flashing to Arduino Uno i.e I could not see cursor blinking

//#include “hd44780_params.h”

#include “hd44780.h”

hd44780_t *a;

hd44780_params_t *b;

void setup(void)

{

hd44780_init(a,b);

}

void loop(void)

{

//hd44780_print(a,“hi”);

hd44780_blink(a,HD44780_ON);

delay(100);

}

Best Regards,

2

Hello,

I noticed that I am using JHD162A LCD display. In one of the RIOT-OS doc, I read that LCM1602C LCD is needed.

Could this be the reason of my unsuccessful Implementation of LCD?

Please help!

3

Hi Patil. The reason might be wrong pin connections. Are you sure about these two LCD have same pin configurations? Sometimes event Vcc and GNC positions differs

24 Eki 2019 Per 12:21 tarihinde PATIL Sangeeta <Sangeeta.PATIL@3ds.com> şunu yazdı:

4

Yes ,the pin connections are correct .

To confirm ,I coded in Arduino IDE (keeping the same pin connection) and it works perfectly

Best Regards,

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5

Then, there might be an issue. It is better to open an issue in github.

4 Kas 2019 Pzt 10:34 tarihinde PATIL Sangeeta <Sangeeta.PATIL@3ds.com> şunu yazdı:

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6

I noticed that I did not include “hd44780_params.h” header file in my sketch. On including it in my sketch, compilation hits error

But in main.c file located in “driver_hd44780 “folder, this header file is included.

Does anyone know about this?

Best Regards,

7

We are looking into some issues with the hd44780 in PR 12634 [1] and hope to have it solved soon. You could try testing with this PR so see if it fixes your issue.

  • Kevin

[1] https://github.com/RIOT-OS/RIOT/pull/12634

8

Thanks Kevin!

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9

Hello ,

Finally ,I could make LCD (JHD162A) work with Arduino-Uno through RIOT OS

I removed lcd initialization from setup and added below two lines in main function ….and it worked !

if (hd44780_init(&dev,&hd44780_params[0])!=0)

{

puts(“failed”);

}

But I don’t understand the logic in context of &hd44780_params[0].

I understand that we are checking the successful initialisation of lcd by using if loop but what are we checking when we pass &hd44780_params[0]

Why can’t we just initialize the lcd as I did in my below e-mail?

Thanks in advance for help!

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