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LCD sniffer for 12 pin custom LCD

VikramSaharan

Hello everyone 

I am trying to interface a TDS test pen with arduino. It has a 12 pin custom LCD. I want to get its LCD readings on serial monitor. I have no data sheet of the device under question.  Kindly help. 

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    Is there any other interface available on that device? Maybe an unpopulated connector on the PCB?
    Or do you know what microcontroller is used, and what pins of that controller go to the LCD?

    If the LCD has a driver IC, it may be (kind of) doable, because the signals will be digital.
    If the controller has the driver embedded (rare), the voltages on the interface pins may invert. Check that first with an oscilloscope.

    If you confirmed that the driver signals are digital 0/1 lines, you can start with the next activity:
    - use a digital analyser to capture communication, and try to relate it to what appears on the LCD. If you manage to solve that, you could build a gizmo, and write software to decode the LCD data into ascii and stream it over a serial.

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