Connect with us

Controlling Yihua 995D for USB control

Discussion in 'General Electronics Discussion' started by StealthRT, Apr 12, 2021.

Scroll to continue with content
  1. StealthRT

    StealthRT

    133
    2
    Sep 4, 2010
    I recently purchased a YIHUA 995D SMD Rework Station and me being the geek that I am wanted to see if I could perhaps control it (via USB/ATMEGA) by using my PC and touch screen instead of physically doing so with my hands. Being able to control it via PC would allow me to mount the 995D under my desk and out of sight so that I have more room to work with on the top of my desk.

    However, I have limited knowledge on "snooping" or "Reverse Engineering" and that is why I am posting my project ideas here in hopes that someone more knowledgeable will be able to let me know what all I need to do in order to accomplish my task.

    I started out thinking I would just simply hook up the ATMEGA and just control the buttons/knobs and leave everything else as-is and just use a webcam focus only on the LCD to view what was on. Although that would work, its not ideal nor is it geeky enough ;D .

    The LCD screen seems to be controlled by the chip Holtek ht1621b. The website for it defines it as a "RAM Mapping 32x4 LCD Controller for I/O MCU". Here is the datasheet for it.

    [​IMG]

    There also seems to be another chip which seems to be the main MCU? It's called the S3 Microcontrollers u820 s3f8s19xzz-qr89 and it's datasheet.

    [​IMG]

    I have high resolution images of the 995D here so that you can see the main board and all it has to offer for this to potentially happen.

    So I am looking forward in learning from others on here as to what I could do for this to happen - or laugh at me and tell me its not possible at which will only get me more interested in doing it upload_2021-4-11_23-50-58.gif

    Disclaimer: Also posted on these sites:
    electronics.stackexchange.com
    electro-tech-online.com
    electronics-lab.com
    EEVBlog.com

    forum.allaboutcircuits.com
     
    Last edited: Apr 12, 2021
  2. StealthRT

    StealthRT

    133
    2
    Sep 4, 2010
    I've noticed that the IC above has a TX/RX UART line(s) looking at the diagram on page 9 of the datasheet.

    [​IMG]

    [​IMG]

    [​IMG]

    [​IMG]

    [​IMG]

    9.7 Port 4

    Port 4 is an 8-bit I/O port with individually configurable pins. Port 4 pins are accessed directly by writing or reading the port 4 data register, P4 at location F5H in set 1, bank 1. P4.0–P4.7 can serve as inputs (with or without pullups) and outputs (push pull or open-drain). P4.7–P4.0 can serve as segment pins for LCD or you can configure the alternative functions:

    Low-byte pins (P4.0-P4.3): T0OUT, TBOUT, TACLK, TACAP, TAOUT

    High-byte pins (P4.4-P4.7): TxD1, RxD1, TxD0, RxD0

    [​IMG]

    Would this be something I could use to read and write the needed info/data to/from the micro controller chip? Would simply getting a USB to UART cable and hooking it up to those 2 pins work like it would when reading RS232 data on an Arduino?

    Disclaimer: Also posted on these sites:
    electronics.stackexchange.com
    Electronicspoint.com
    electro-tech-online.com
    electronics-lab.com
    EEVBlog.com
    avrfreaks.net
     

    Attached Files:

    Last edited: Apr 12, 2021
Ask a Question
Want to reply to this thread or ask your own question?
You'll need to choose a username for the site, which only take a couple of moments (here). After that, you can post your question and our members will help you out.
Electronics Point Logo
Continue to site
Quote of the day

-