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hi fellow hobbyists.. ?about sensors

Discussion in 'Sensors and Actuators' started by elioacm, Dec 3, 2018.

  1. davenn

    davenn Moderator

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    Sep 5, 2009

    that's for you to show us
    you cannot expect us to supply a circuit diagram for some unknown board
     
    (*steve*) and hevans1944 like this.
  2. (*steve*)

    (*steve*) ¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd Moderator

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    It's posts like this that make me wish for a "WTF?" button instead of a "like" button.
     
    hevans1944 and davenn like this.
  3. elioacm

    elioacm

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    been researching got a simple circuit diagram thanks.. clearly this steve aint helping and doesnt read clearly my topic or got to understand me very well.. i will update soon.. btw the circuit has a LM393 and the one im supposed to do is a larger LM 353 ordered new photo diode and ir transmiter the clear one.

    one i said "to show me a circuit diagram" so you dont know that pre-built sensor? im assuming cause your in my topic clearly you have understand my topic very well.. no? its not an unknown board for some sensor hobbyists like me. its a
    "IR Infrared Obstacle Avoidance Sensor Module" thats the name of the board.

    and by the way it works thats the one im hoping to re-create.
     
    Last edited: Jan 8, 2019
  4. (*steve*)

    (*steve*) ¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd Moderator

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    Yeah, sorry, I really don't understand you very well.
     
  5. elioacm

    elioacm

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    Jul 7, 2013
    how old are you steve? could you mentor me?
     
  6. (*steve*)

    (*steve*) ¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd Moderator

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    Ancient

    No, sorry. But if you can ask clear questions, I (and many people here) can put effort into answering them.
     
  7. hevans1944

    hevans1944 Hop - AC8NS

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    Problem is, most newbies either cannot or will not take the time and put forth the effort to ask clear questions. 99 44/100% of the time they already have a preconceived notion of the "solution" to their "problem" and just want "a little help" actualizing what they believe is their solution. So instead of stating what they want to DO, i.e., defining the problem, they instead state what they have tried and failed and then ask "whut did ah do wrong?" Most don't realize that there are many different acceptable solutions to almost anything. Which one is acceptable to you depends of what boundaries you define.
     
  8. elioacm

    elioacm

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    Jul 7, 2013
    geez you people sound smart, but patience pls. thanks. im working on it.

    you want a question like this? sample below;
    (all the things i will write in here is in google so.. i rather ask questions here cause its the simpliest "WAY" and the simpliest way to get "ANSWERS" so my questions here is not the problem)

    so my new question is, how many parts to make a simple ir obstacle proximity detector. thats a good question no?
     
    Last edited: Jan 9, 2019
  9. (*steve*)

    (*steve*) ¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd Moderator

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    Jan 21, 2010
    No. That's not a good question. What if I give you the answer "47"? Would that help you?

    A good question might be:

    "What methods could be used to detect proximity of a wall for my robot? I am interested only in proximity in a single fixed (relative to the platform) direction. I am interested in distances between about 4cm and 10cm. All I need is an indication of a nearby object, not the distance. The walls are all painted white."

    With that sort of question we might suggest either reflected IR or an ultrasonic distance sensor (and we might offer some advantages and disadvantages of both).

    Let's say that we tell you the IR sensor is far simpler, but it might detect walls further away than 10cm.

    And let's also say you can relax your requirements and go for an IR sensor. You might then ask:

    "I'm not familiar with how to build an IR sensor. How might I build a sensor with the requirements listed above (knowing that it might detect obstacles more than 10cm away)?"

    Someone might suggest that you get an IR LED and photodiode and arrange them at an angle so the photodiode only sees an illuminated area of the obstacle if it is quite close. We may suggest you use your mobile phone to view the illuminated area.

    Once you have this conceptually sorted out, you might ask for a good circuit to create the required signal when a wall is in range.

    We might then suggest some sort of missing pulse detector with agc or similar to allow for differing ambient light levels.

    You could go away and try this and tell us that it produced a signal when there is no wall, the opposite of what you require.

    We might then suggest how you can invert the signal or recommend that you change whatever you have that detect the signal to select the opposite.

    We would expect you to initially clearly outline the entire problem, and provide any additional details requested. At each stage we would expect you to evaluate options you are given, doing any tests needed to determine suitability. You would also be expected to reevaluate your requirements based on your appetite for complexity or reliability, or any other factors that arise.

    It's hard work to do this. You may not know what is important and what is unnecessary detail. It's probably best thank you summarise detail, but offer to expand on the details if asked (people may not want to read a long time).

    You'll make mistakes, and we'll make mistakes, but keeping things as simple and as clear as possible will keep is all on topic and productive.
     
    Last edited: Jan 9, 2019
    BobK, hevans1944 and Harald Kapp like this.
  10. hevans1944

    hevans1944 Hop - AC8NS

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    Jun 21, 2012
    Nah, I am moderately ancient. You, OTOH, are ripely mature...:D
     
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