128x64 Graphic LCD Module

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asuz
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128x64 Graphic LCD Module

#1 Post by asuz » 20 Dec 2018, 18:55

Hello, I have 128x64 Graphic LCD Module with I2C Graphic 128x64 LCD Adapter. I cannot success to connnect and get display form NodeMCU Lolin V3 CH340 Esp8266. I2C Graphic 128x64 LCD Adapter has 5 pins LCD+,SCL,SDA,GND,+5V. I dont know where to LCD+ connect to the NodeMCU. Is there anybody help me?
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ThomasB
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Re: 128x64 Graphic LCD Module

#2 Post by ThomasB » 20 Dec 2018, 22:24

The Lolin NodeMCU provides +5V on its VU pin.

Per the supplier's information, controlling the LED+ pin requires a modification. As follows:
Control of backlight: Normal backlight use power 5V from +5V and can ajust with potentiometer. If you need control of backlight from microcontroller, pls cut-off connection of backlight on top side of board, and connect the Pin LED+ to any PWM out of microcontroller.
- Thomas
Last edited by ThomasB on 20 Dec 2018, 23:25, edited 3 times in total.

asuz
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Re: 128x64 Graphic LCD Module

#3 Post by asuz » 20 Dec 2018, 22:31

ThomasB wrote: 20 Dec 2018, 22:24 The Lolin NodeMCU provides +5V on its VU pin.

- Thomas
Should I put the I2C Graphic 128x64 LCD Adapter's LCD+ pin to the 5V? or you misunderstood me?

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ThomasB
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Re: 128x64 Graphic LCD Module

#4 Post by ThomasB » 20 Dec 2018, 22:38

5V Power is applied to the LCD's +5V pin.

asuz
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Re: 128x64 Graphic LCD Module

#5 Post by asuz » 20 Dec 2018, 22:48

ThomasB wrote: 20 Dec 2018, 22:38 5V Power is applied to the LCD's +5V pin.
Need to undserstand you perfect for that reason need to ask again. There is a LCD+ pin at he I2C Adapter. Should I connect LCD+ to the 5V pin on nodemcu?

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Re: 128x64 Graphic LCD Module

#6 Post by ThomasB » 20 Dec 2018, 23:04

Need to undserstand you perfect for that reason need to ask again. There is a LCD+ pin at he I2C Adapter. Should I connect LCD+ to the 5V pin on nodemcu?
No, you would not connect 5V to LCD+. For details on LCD+, please see the added info on post #2.

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Re: 128x64 Graphic LCD Module

#7 Post by ThomasB » 20 Dec 2018, 23:18

After looking over their schematic I have to correct my previous post. According to their details the LCD+ is power for the LCD LED. But there's a missing jumper, so I don't know what their intent is for this pin. My board is older and is missing this pin, so I can't confirm what they intend you to do.

Schematic is here: https://robotdyn.com/pub/media/0G-00005 ... 128x64.pdf

- Thomas

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Re: 128x64 Graphic LCD Module

#8 Post by ThomasB » 21 Dec 2018, 00:00

Did some more digging: Their published schematic seems to be from an different version because it does not fully match your board. It shows that the LCD+ pin is pass-through power to the LCD's LED backlight. And the product photo shows that the J2 jumper is present (a copper trace), so LED should be connected to the LCD+ pin. There's a LED current limit resistor in there too, but they do not state the value.

So if it was me, and I wanted to use the LCD's LED backlight, I would first check to see if the LED backlight turns-on without connecting the LCD+ pin. If the backlight does not turn-on then you should try out LCD+ pin. For LED safety, apply 5V power through a 100-220 ohm resistor that is series connected to LCD+. If the LED backlight is too dim, then that will be a good sign that it is safe to remove the series resistor.

The documentation is poor. So that means you'll just have to assume some risk, and expect to experiment, if you need to use the LCD+ pin. Be sure to share what you learn here to help the next guy.

- Thomas

asuz
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Re: 128x64 Graphic LCD Module

#9 Post by asuz » 21 Dec 2018, 00:14

OK I will experiment possibilities. Sould I choose device of LCD2004 at task settings?

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ThomasB
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Re: 128x64 Graphic LCD Module

#10 Post by ThomasB » 21 Dec 2018, 00:35

As far as I know your graphic display is not currently supported by ESP Easy. Perhaps someone has published something for it in ESP Easy's Github PlayGround. Otherwise you'll have to write your own plugin for it.

- Thomas

asuz
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Re: 128x64 Graphic LCD Module

#11 Post by asuz » 21 Dec 2018, 13:58

ThomasB wrote: 21 Dec 2018, 00:35 As far as I know your graphic display is not currently supported by ESP Easy. Perhaps someone has published something for it in ESP Easy's Github PlayGround. Otherwise you'll have to write your own plugin for it.

- Thomas
I am not expert at programming skill to write my own plugin so need volunteer to do it for me :)

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ThomasB
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Re: 128x64 Graphic LCD Module

#12 Post by ThomasB » 21 Dec 2018, 18:26

I did a quick search and couldn't find any other ESPEasy users that mentioned this display. So there does not seem to be any active interest within the community. That means you'd need be the one to develop a plugin.

BTW, your robotdyn display is a 5V device and the ESP8266 is a 3.3V device. So the I2C SCL and SDA connections will need a logic level convertor.

If you desire a big graphic display then I would suggest you consider the Nextion Plugin. The Nextion LCD provides beautiful graphics and has a touch screen too. A 2.8" size display is $20 USD.
https://www.letscontrolit.com/wiki/inde ... le=Nextion

- Thomas

asuz
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Re: 128x64 Graphic LCD Module

#13 Post by asuz » 21 Dec 2018, 21:10

ThomasB wrote: 21 Dec 2018, 18:26 I did a quick search and couldn't find any other ESPEasy users that mentioned this display. So there does not seem to be any active interest within the community. That means you'd need be the one to develop a plugin.

BTW, your robotdyn display is a 5V device and the ESP8266 is a 3.3V device. So the I2C SCL and SDA connections will need a logic level convertor.

If you desire a big graphic display then I would suggest you consider the Nextion Plugin. The Nextion LCD provides beautiful graphics and has a touch screen too. A 2.8" size display is $20 USD.
https://www.letscontrolit.com/wiki/inde ... le=Nextion

- Thomas
Ok thank you for the advice. Which model do you suggest me? e.g. https://www.aliexpress.com/item/2-4-Nex ... 62032.html

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ThomasB
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Re: 128x64 Graphic LCD Module

#14 Post by ThomasB » 21 Dec 2018, 21:58

Yes, you can use any of the NX series displays. I'm using the 2.8" model (Nextion NX3224T028).

Here is a summary of the NX Family:
https://www.itead.cc/display/nextion.html

- Thomas

asuz
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Re: 128x64 Graphic LCD Module

#15 Post by asuz » 21 Dec 2018, 22:38

ThomasB wrote: 21 Dec 2018, 21:58 Yes, you can use any of the NX series displays. I'm using the 2.8" model (Nextion NX3224T028).

Here is a summary of the NX Family:
https://www.itead.cc/display/nextion.html

- Thomas
Thank you very muchhhhhh for all sharings :)

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Re: 128x64 Graphic LCD Module

#16 Post by ThomasB » 21 Dec 2018, 22:49

You're welcome. I wish you good luck with your ESPEasy project.

- Thomas

zaac
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Re: 128x64 Graphic LCD Module

#17 Post by zaac » 25 Apr 2019, 21:14

This unit comes with a jumper pin installed. You need to know to pull this cross loose to enable control of the backlight.
Attached LED+ to a PWM and you are ready to go.
Note the text to the left on the board that says Backlight control- that is what you need to change to gain digital control over the backlight.

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