LCD SNIFFER using Arduino

[vikramjeetagam]

Hello everyone
I am trying to interface a low coast TDS meter with arduino. This meter has 12 pin custom LCD. I want to get its lcd data on serial monitor. Kindly help me

[TomGeorge]

Hi, @vikramjeetagam
Welcome to the forum.

How to get the best out of this forum

See also FAQ - Arduino Forum for general rules on forum behaviour and etiquette. Hello, Welcome to the Arduino Forum. This guide explains how to get the best out of this forum. Please read and follow the instructions below. Being new here you might think this is having rules for the sake of rules, but that is not the case. If you don’t follow the guidelines all that happens is there is a long exchange of posts while we try to get you to tell us what we need in order to help you, which is fru…

Can you please tell us your electronics, programming, arduino, hardware experience?

Can you please post a link to data/specs of the TDS meter?

Thanks.. Tom..

[StefanL38]

@vikramjeetagam

This meter has 12 pin custom LCD.

Examine the TDS meter and the LCD for all kinds of type-numbers.
Search for usermanuals and datasheets with these numbers.

Finding the datasheet of the LCD will save you between 50 and 500 hours of analysing which pin of the 12 pins does what.
If you find the datasheet you can follow this approach to make it work.

If you read these numbers 50 to 500 hours; I recommend considering investing in working in a job maybe 20 hours to earn the money to buy a new TDS-meter.

The only exception would be
if learning a lot of details about how all kinds of LCDs work and what signals, commands etc. they use is the main fun in this project.

best regards Stefan

[vikramjeetagam]

I am a beginner in this field and working on a hydrophobics project. I want to develop a DIY hydroponics automation system usin Arduino or NODE MCU.

This is the image of Tds meter pcb it has main ic with no any specification and another 8 pin ic having marking ATMLH904

[Paul_KD7HB]

@vikramjeetagam

I am trying to interface a low coast TDS meter with arduino. This meter has 12 pin custom LCD. I want to get its lcd data on serial monitor. Kindly help me

Begin by telling us if the meter actually works properly! There is no reason to continue if it does not work.

[6v6gt]

There is this sniffer:

LCD 1602 (and similar) databus sniffer

This is a basic sketch to demonstrate sniffing the data bus of an LCD 1602 display to interpret the contents of the display. This could be useful if, for instance, you are using a 3rd party product for which you have no source code and which incorporates one of these displays, and you need to extract some information from it. Actually, I started this project as an experiment to get familiar with a new logic analyser and have no current plans to develop this further. I've, however, seen a couple…

[vikramjeetagam]

Sir
The circuit under question has a 12 pin lcd without any specification and pin description. On one side of pcb where lcd mounted P1 is written. So how to recognise pins.

[StefanL38]

@vikramjeetagam

So how to recognise pins.

If you have no datasheet the left way to find out what pin is what will be
by doing hours long tests using a 24 MHz 8 channel logic analyser to find out:

• which pin might be a clock signal which pins might be the datasignals.
• After having found the pins which are the datasignals you have to find out
• which is bit 0, bit1, bit2 etc.
• if it is a 4bit interface or an 8 bit interface.
• After finding out this you have to find out which type of LCD-controller is used
  is it 44780? or one of the half-dozen other LCD-driver chips.

Do you now have a rough picture of how much work this will be if you have no datasheet?

In summary: if you have no datasheet the probality that there are hundreds of hours work in front of you is why I recommend considering

1. searching for components where you have downloaded the datasheets before you even buy the components.

2. working 20 hours in any easy to do job to earn the money to buy the well documented components

If you enjoy becoming an expert about all kinds of LCD-drivers and how to analyse them from scratch using an 8 channel or better 16 channel logic analyser go ahead!

best regards Stefan

[vikramjeetagam]

Thank you

[vikramjeetagam]

Sir the lcd under discussion may be similar to this.
Kindly check it

[StefanL38]

@vikramjeetagam

Kindly check it

I checked it. Number of columms (12) is equal to the number of pins (12) as you described.
I'm sorry not more checking possible as I don't have your LCD lying on the table.
Any deeper checking would be similar to make you a very detailed list

1. breath in
2. breath out
   .....
   I won't do anymore than this link.
   Let Me Google That
   good luck ! I'm out. thread muted.