How to Reverse Engineer Common LCD Kitchen Timers (Egg timers) with Arduino

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  • Опубликовано: 10 дек 2024

Комментарии • 66

  • @SecularMentat
    @SecularMentat 10 месяцев назад +12

    Love the work you've done here. I really like the idea of reverse engineering and coopting already made products to do projects.

  • @jdk8787
    @jdk8787 10 месяцев назад +20

    Nice video. I like how you walked through the different options and why you choose one over another. Not too much detail, just enough. How you used trial and error to determine the pinout of the screen that was very helpful. In the past I have thrown out those screens from old devices, thinking it would be impossible to figure out what all the pads on it do. But you have shown that, with enough time, I could figure it out.
    There are a lot of basics videos on electronics and microcontrollers, but after learning the basics I find it hard as a hobbyist to learn more intermediate level projects like this. Thanks for the video, I know how much time and effort go into making it.

    • @makersfunduck
      @makersfunduck  10 месяцев назад +7

      Thanks. There are tons of theory videos. What we makers do not have is practical explanations. Thats why I am trying to not get into theory, and try to focus on what is important to us :)

  • @koraypekericli
    @koraypekericli 10 месяцев назад +2

    Fantastic way to creep out people randomly with quick odd messages in between timer button presses. 😀 Great work! Thank you!

    • @makersfunduck
      @makersfunduck  10 месяцев назад

      :D might be indeed quite funny

  • @MaxintRD
    @MaxintRD 10 месяцев назад +2

    Excellent video! Liked & Subscribed... I love how you gave very clear explanations on how you went about reverse engineering this timer and how to control it. It reminds me of the bank card reader I once gutted to reuse its LCD.
    Nice to see that versatile PCB you made. I made a library for TM16xx LED drivers that includes a 7-segment font to implement the familiar Arduino print function. As you say most characters can be made up using 7 segments in a fairly readable form and with a bit of scrolling even 4 digits can be enough to display a longer message.
    I knew about the TM1621D chip, but didn't use them yet. Your video encourages me to buy some too and perhaps include them into my TM16xx library. Thank you for sharing!

    • @makersfunduck
      @makersfunduck  10 месяцев назад

      Thanks for your kind comment. Indeed having a proper library is a great idea. I also saw your library. Others can easiliy use it for their own purposes. It might be a good idea to have a pointer to define all the segments first. Because pinouts are different for most screens, and there are custom segments on most LCDs. Maybe instead of including it to existing library, a separate library would be easier to use.

    • @MaxintRD
      @MaxintRD 10 месяцев назад

      @@makersfunduck- Thank you for the suggestion. Good point. In the past I've also encountered need for such segment mapping and I've implemented support in a few sub-libraries, mainly for addressing 15-segment alphanumeric LED displays. I intend to make it into a generic feature but I'm still figuring out what the best way would be to unify the variations in memory size, number of segments and common anode vs. cathode usage. Perhaps it's best to redesign the library, but for now I try to keep it compatible with its predecessors.

  • @TheSchizoDuckie
    @TheSchizoDuckie 10 месяцев назад +14

    That was bloody awesome, I learned loads from this. thanks!

    • @makersfunduck
      @makersfunduck  10 месяцев назад +3

      You're very welcome! I'm thrilled to hear that you found it awesome and learned a lot. If you have any more questions or need further clarification on anything, feel free to ask.

  • @jensschroder8214
    @jensschroder8214 10 месяцев назад +6

    I've already done that with an Arduino Mega 2560.
    in the loop:
    I2C was read out,
    packed into a string,
    an LCD font was applied,
    and the pins were sorted,
    created an inverted image.
    The pins are output with an free running interrupt, straight or inverted.
    The only disadvantage I needed a lot of IO pins.

    • @makersfunduck
      @makersfunduck  10 месяцев назад +4

      Another disadvantage would be the code I think if it had more than 1 digit. If you have your code somewhere, that would be nice if you can share it.

  • @mattsan70
    @mattsan70 10 месяцев назад +63

    I watched the whole video but still don't know how long I should boil my eggs for.

    • @makersfunduck
      @makersfunduck  10 месяцев назад +7

      :D me neither @mattsan, me neither.

    • @TheTruthfly
      @TheTruthfly 10 месяцев назад +4

      ​​@@luuuuuuuuuuuul
      3-5 minutes: liquid yolk with soft, whites not fully set
      6 minutes: liquid yolk with fully set whites
      7 minutes: jammy yolk with outer edges set
      8 minutes: half set yolk
      9 minutes: half set yolk
      10 minutes: mostly set yolk
      15 minutes: hard as a rock

  • @JoPiDo
    @JoPiDo 10 месяцев назад +3

    Thanks!

  • @EdwinMartin
    @EdwinMartin 10 месяцев назад +9

    Very nice explanation! Thanks for sharing.

  • @FixitFrank
    @FixitFrank 10 месяцев назад +4

    I did a whole project that used one of those LF1902's. I was driving a 10-pin 4 digit 1/3 duty cycle TN display that I had made.

    • @makersfunduck
      @makersfunduck  10 месяцев назад +2

      It sounds pretty cool. Couldnt find it in your channel though.

  • @dktr2
    @dktr2 10 месяцев назад +5

    Please note that powering the LCD with direct current (DC) will quickly damage the display.

    • @makersfunduck
      @makersfunduck  10 месяцев назад +2

      Hi dktr2, thanks for pointing out to the @4.42 in the video. It is indeed worth emphasizing.

  • @jw200
    @jw200 10 месяцев назад +6

    Thanks.
    I can try this on other LCDs also.

    • @makersfunduck
      @makersfunduck  10 месяцев назад +2

      You are welcomed. Would like to hear back from you if you come up with a cool project :)

  • @TheIronHeadRat
    @TheIronHeadRat 10 месяцев назад +6

    Thanks for sharing 👍

  • @trippycat
    @trippycat 10 месяцев назад +4

    nice work

  • @riccardoiacob4560
    @riccardoiacob4560 10 месяцев назад +8

    You could also design a small boost converter and put it on the PCB, so you can use standard AAA cells. Although the small AAAs don't have much energy.

    • @b0e
      @b0e 10 месяцев назад

      don't forget about deep sleep ! @@makersfunduck

  • @fons
    @fons 5 месяцев назад

    You can reverse engineer it without any soldering by using square signal of ~100Hz (with an amplitude of 1.5 volts in this case). You can then connect the square signal pairwise on the LCD pins until you figure out which are the Common and Segment pins.

  • @ScriptCoded
    @ScriptCoded 10 месяцев назад +2

    Smart idea! Maybe an optional USB port could be nice for power

    • @makersfunduck
      @makersfunduck  10 месяцев назад +1

      It is a nice idea. I will add usb from now on for the next projects :)

  • @ΚωνσταντίνοςΣταθόπουλος-υ5η

    Hi, do you believe you could assist in reverse engineering an Opel LCD screen (specifically the Opel clock display) for a project I'm working on? I aim to utilize the factory screen, but I'm encountering difficulties achieving the desired functionality due to my limited knowledge. I'm willing to purchase the screen for you to work with, so there won't be any expense on your end.

  • @orangeinfotainment620
    @orangeinfotainment620 10 месяцев назад +3

    Thank you sm

  • @DaveyRaaijmakers
    @DaveyRaaijmakers 10 месяцев назад

    Heel erg vet, ik ga dit zeker ook proberen. Waar heeft u de oorspronkelijke wekker gekocht?

    • @makersfunduck
      @makersfunduck  10 месяцев назад +2

      Action store :)

    • @DaveyRaaijmakers
      @DaveyRaaijmakers 10 месяцев назад

      @@makersfunduck Dank je wel, ik ga het zeker ook uitproberen.

  • @VEC7ORlt
    @VEC7ORlt 10 месяцев назад +5

    Pretty sure you dont even need a driver, you could have easily bit banged it, as the drive frequency is something like 50hz is sufficient.

    • @makersfunduck
      @makersfunduck  10 месяцев назад +4

      You are technically correct. But programming part was a little tricky. Also your mcu needs to work all the time even if you put interrupts + it saves you pins. So I thought I could afford just 20 cents for all these luxuries :)

  • @necoisidois7570
    @necoisidois7570 10 месяцев назад +1

    LCD, how much VOLT need?

    • @makersfunduck
      @makersfunduck  10 месяцев назад

      the one that I used required roughly 1.5 V.

  • @ElectronDuino
    @ElectronDuino 10 месяцев назад

    How did you make the LCD footprint?

    • @makersfunduck
      @makersfunduck  10 месяцев назад +2

      with KiCAD footprint editor

    • @ElectronDuino
      @ElectronDuino 10 месяцев назад

      Sorry for the wrong question. I mean how did you take the measurements for the pads? With a caliper?

    • @makersfunduck
      @makersfunduck  10 месяцев назад +3

      @@ElectronDuino Ah, yes. I have used a caliper and took measurements. and to relax the tolerances, I made the pins a bit wider and longer than the original footprint.

  • @sabyasachisarangi
    @sabyasachisarangi 10 месяцев назад

    Can you do one with the oximeter color lcd?

    • @makersfunduck
      @makersfunduck  10 месяцев назад

      Do you already have one at hand and checked what mcu is used in it?

    • @sabyasachisarangi
      @sabyasachisarangi 10 месяцев назад

      @@makersfunduck I have one that I am using, let me try to get a look.

  • @jayare7750
    @jayare7750 7 месяцев назад

    No 8008?

  • @lohikarhu734
    @lohikarhu734 10 месяцев назад

    No oscilloscope?

    • @makersfunduck
      @makersfunduck  10 месяцев назад

      well, you dont need one for this.

  • @lo2740
    @lo2740 10 месяцев назад +5

    that is not "reverse engineering" by any stretch, it is simply random "DIY project" aka "youtube content" consisting of connecting a 20 years old avr to a random segment LCD, which is not an achievement, really, any segment LCD is extremely easy to drive.

    • @TheSchizoDuckie
      @TheSchizoDuckie 10 месяцев назад +18

      I hope it helped you got that out of your system.
      Sometimes it's just better to say nothing on the internet.
      This is one of those times.

    • @ParodieHecker-mobile
      @ParodieHecker-mobile 10 месяцев назад +11

      You must be fun at parties 🤓

    • @ddjazz
      @ddjazz 10 месяцев назад +6

      I also assumed after reading the title he found a way to reprogram the "blob" to customize the egg timer function. It is not , but still an interesting video.

    • @pro5p3c7or1
      @pro5p3c7or1 10 месяцев назад +6

      show us your video lets see how good is compare to this... what? you don't upload videos? then "stfkup "dude, nobody cares

    • @Raytenecks
      @Raytenecks 10 месяцев назад +7

      He did reverse engineer the pinout of the LCD, which helped make sure the controller he was getting would work with what he would buy.

  • @rleonmx
    @rleonmx 10 месяцев назад

    eso no ingeniería inversa, es reciclar una pantalla y reusar botones, que chafa video

    • @MaxintRD
      @MaxintRD 10 месяцев назад

      Totally disagree. Finding out what connection does what without documentation, is reverse engineering in my book...