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LCD 20x4 I2C

 

Hello,
finally have 20x4 lcd I2C
and conect SDA on D4, SCL on D5
working with UBITX_CEC_V1.08I but not working.
If try with 20x4 paralel conect like on original uBITX and UBITX_CEC_V1.08P working fine
What mistake I was made.

Bye Matjaz
 

I have 2 4x20 i2c displays from 2 different manufacturers and they have different addresses. One is 03F ? and the other is 0x27 ?and they work fine. Make sure the firmware is set up for i2c and once loaded you can go into the ubit manager and change the address if that is the problem.
73's ?kn4ud ?
--
Allen ?Merrell
 

matjaz

1. Make sure that the firmware is registered as xxx20I.hex file
2.Check the SDA, SCL
3.The address of I2C must be set in uBITX Manager.
? All I2C devices have unique addresses.
?Usually the LCD is 0x3F or 0x27, but the address can change depending on the jumper setting. Please refer to the I2C converter manual.??
?Or you can use simple sources to find addresses.
?
Ian KD8CEC

2018-06-05 22:26 GMT+09:00 matjaz via Groups.Io <matjaz_zejn@...>:

Hello,
finally have 20x4 lcd I2C
and conect SDA on D4, SCL on D5
working with UBITX_CEC_V1.08I but not working.
If try with 20x4 paralel conect like on original uBITX and UBITX_CEC_V1.08P working fine
What mistake I was made.

Bye Matjaz



--
Best 73
KD8CEC / Ph.D ian lee
kd8cec@...
(my blog)
 

You can't just connect D4 and D5 to the SDA/SCL leads.

You need an I2C adapter added to the back of the lcd.

this is an example:

www.ebay.com/itm/Serial-IIC-I2C-Adapter-1602-1604-2002-LCD-Backpack-Arduino-FAST-SHIP-US-SELLER/171036006949?hash=item27d28a5a25:g:vNIAAOSwMmBVnc7K:sc:USPSFirstClass!66609!US!-1

tim ab0wr

On Tue, 05 Jun 2018 06:26:37 -0700
"matjaz via Groups.Io" <matjaz_zejn@...> wrote:

Hello,
finally have 20x4 lcd I2C
and conect SDA on D4, SCL on D5
working with UBITX_CEC_V1.08I but not working.
If try with 20x4 paralel conect like on original uBITX and
UBITX_CEC_V1.08P working fine What mistake I was made.

Bye Matjaz
 


I would remove the 5v pullups from the LCD backpack, the Raduino still has 3.3v pullups on those lines.
A 3.3v high into the PCF8574T chip on the LCD backpack board seems to work fine.
? ? /g/BITX20/message/39966

?

On Tue, Jun 5, 2018 at 10:07 am, Tim Gorman wrote:
You can't just connect D4 and D5 to the SDA/SCL leads.

You need an I2C adapter added to the back of the lcd.

this is an example:

www.ebay.com/itm/Serial-IIC-I2C-Adapter-1602-1604-2002-LCD-Backpack-Arduino-FAST-SHIP-US-SELLER/171036006949?hash=item27d28a5a25:g:vNIAAOSwMmBVnc7K:sc:USPSFirstClass!66609!US!-1
 

¿ªÔÆÌåÓý

I have this one
Try all address? 0x3F and 0x27 but always equal
?
bye Matjaz
?

Sent: Tuesday, June 05, 2018 7:42 PM
Subject: Re: [BITX20] LCD 20x4 I2C
?

I would remove the 5v pullups from the LCD backpack, the Raduino still has 3.3v pullups on those lines.
A 3.3v high into the PCF8574T chip on the LCD backpack board seems to work fine.
??? /g/BITX20/message/39966

?
On Tue, Jun 5, 2018 at 10:07 am, Tim Gorman wrote:
You can't just connect D4 and D5 to the SDA/SCL leads.

You need an I2C adapter added to the back of the lcd.

this is an example:

www.ebay.com/itm/Serial-IIC-I2C-Adapter-1602-1604-2002-LCD-Backpack-Arduino-FAST-SHIP-US-SELLER/171036006949?hash=item27d28a5a25:g:vNIAAOSwMmBVnc7K:sc:USPSFirstClass!66609!US!-1
 

Your ebay link says that the default is 0x20. check the address on the display to confirm the correct address. or use the I2C scanner to find it.

Paul
 

¿ªÔÆÌåÓý

Change wire and now all ok.
?
73
Matjaz
?

Sent: Tuesday, June 05, 2018 8:59 PM
Subject: Re: [BITX20] LCD 20x4 I2C
?
I have this one
Try all address? 0x3F and 0x27 but always equal
?
bye Matjaz
?
Sent: Tuesday, June 05, 2018 7:42 PM
Subject: Re: [BITX20] LCD 20x4 I2C
?

I would remove the 5v pullups from the LCD backpack, the Raduino still has 3.3v pullups on those lines.
A 3.3v high into the PCF8574T chip on the LCD backpack board seems to work fine.
??? /g/BITX20/message/39966

?
On Tue, Jun 5, 2018 at 10:07 am, Tim Gorman wrote:
You can't just connect D4 and D5 to the SDA/SCL leads.

You need an I2C adapter added to the back of the lcd.

this is an example:

www.ebay.com/itm/Serial-IIC-I2C-Adapter-1602-1604-2002-LCD-Backpack-Arduino-FAST-SHIP-US-SELLER/171036006949?hash=item27d28a5a25:g:vNIAAOSwMmBVnc7K:sc:USPSFirstClass!66609!US!-1

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