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  1. Replies
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    Re: Diffuser IR Leds (how)

    Hi Craig

    IR sensors work, I have used them detecting water in a pipe. Admittedly the pipe was 6mm not 13mm but it worked. An LDR is not know to work and covers 10x the area I need to detect. It...
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    Re: Diffuser IR Leds (how)

    I'm not worried about the surface tension. I will be only measuring in the middle.
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    Re: Diffuser IR Leds (how)

    Hi Les

    No Acrylic involved in the diffuser.

    Below is picture of the tube backlit by an led strip they are around 15mm apart. In front of the leds (set back 6mm) is a sticker with white semi...
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    Re: Diffuser IR Leds (how)

    Hi Les

    The issue is that you cannot see the whole column properly up close. If you can stand back enough and have perfect lighting and resolution it might work.

    But get up close and you need a...
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    Re: Diffuser IR Leds (how)

    Hi, Lots of good tips.

    Some more info before I look through them some info perhaps missed.

    The RD work is to produce a product I need to sell. So I have to source parts that I can get easily. ...
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    Re: Diffuser IR Leds (how)

    Hi,

    Just to address a few important points. I need it to be solid state, mechanical movement is not a good idea as it will add cost and reduce reliability and be bulky.

    Cameras will not work...
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    Diffuser IR Leds (how)

    Hi....

    My task (still! :( ) is to measure the water level in a tube to high accuracy. One system I know works is to use a slot opto sensor. But they are expensive and way to big. My resolution...
  8. Re: What to do with electronic comps I'm not going to use

    Thanks Les great for them to go to a good home.
  9. What to do with electronic comps I'm not going to use

    I'm having a big clean out and it has become obvious I have a problem. I think of a design buy some comps, maybe get round to building something then the leftovers pile up. Over and over again.
    ...
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    Re: I'm over the moon with joy. :-)

    Les got there first !

    I think I got it wrong any case
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    Re: HAs anyone used the TSL1401CL linear sensor?

    To answer the questions

    1 The level changes all the time at any time
    2 The water is pure so non conductive and 1 mm resolution is need
    3 The water column is always sealed to atmosphere unless...
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    Re: Wheelchair speed control

    Just to add that the simple algo worked when there was no loading. In your case I suspect that going up a hill it would not work. And when I wrote a speed controller for a mixer motor that used as AC...
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    Re: Wheelchair speed control

    From my experience I have never had luck with PID's

    In the end I found that a simple system works best

    X = desired speed.
    Y = current speed.

    So every x ms inc the current speed until x is...
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    Re: HAs anyone used the TSL1401CL linear sensor?

    May be something like this would work for my stepper linear system

    https://www.ebay.co.uk/i/332647887284?chn=ps
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    Re: HAs anyone used the TSL1401CL linear sensor?

    In my application the volumes are very small and effected by many effects like surface tension. I see no easy solution. A stepper motor and say 5 opto sensors would work 100% and I may end up doing...
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    Re: HAs anyone used the TSL1401CL linear sensor?

    Hi David

    Even reading the specs and watching the videos I was on the edge of what could be achieved. Initial experiments using the demo board had a small change register. Flushed with that success...
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    Re: HAs anyone used the TSL1401CL linear sensor?

    Hi David

    I was using the FDC1004 The sensor PCB (pic below) was immersed in the water. Due to the volume of water I am using I have to work to around 1mm precision. When I rigged up the test board...
  18. Thread: Barking dog

    by Tim
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    Re: Barking dog

    This may be of interest

    https://www.grc.com/tqc/thequietcanine.htm

    The reality is with the inverse square law, unless you are a meter front of the pest you're unlikely to get enough power to do...
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    Re: HAs anyone used the TSL1401CL linear sensor?

    What I was thinking was moving up and down to find the edge then jiggle to keep track of it.
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    Re: HAs anyone used the TSL1401CL linear sensor?

    Hi John

    I was looking for one of those but they do not seem to be available. Then found the TSL1401CL
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    Re: HAs anyone used the TSL1401CL linear sensor?

    The next possible solution is a belt driven by a motor and a light sensor that tracks the level. But I'm looking for a solid state solution.
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    Re: HAs anyone used the TSL1401CL linear sensor?

    A float would be the ideal solution and on a part of the same project I do have a float. It uses hall effect sensors and a magnet in the float. But at this exact location in the design I am up...
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    Re: HAs anyone used the TSL1401CL linear sensor?

    My use is to try and measure the height of water to 1 mm accuracy. It relies on refraction and how light passing through a tube gets magnified. So the small strip in the middle gets enlarged.

    For...
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    Re: HAs anyone used the TSL1401CL linear sensor?

    Thanks Les

    I have one on order when it arrives I will send it to you and get one another one for myself.

    Tim
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    HAs anyone used the TSL1401CL linear sensor?

    Hello people,

    Has anyone used the TSL1401CL linear sensor? It is most likely found in an a unit like this:-

    3615

    Reading the PDF it seems you control it using the clock to change charge time...
  26. Thread: Pt100

    by Tim
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    Re: Pt100

    I'm not sure where you get them but PT50 is a thing.

    https://www.technocontrols.com/wire-wound-rtd-elements.html
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    Re: Suggestions for pic microcontroller

    1 ADC? How much memory

    https://www.microchip.com/maps/Microcontroller.aspx
  28. Re: Detecting for the presence of pulses not using interrupts

    As I said about the PCF8574, 30khz interrupts. Not a practical idea.

    Ref the 18F26K42, I do not have the VSM for it in ISIS. As I can do all I need with a simple 16F device no need to use anything...
  29. Re: Detecting for the presence of pulses not using interrupts

    Hi Joseph

    Yes the chance of it stopping on a low is possible. So will be using a pic and just read the pulses really fast in loop looking for a signal change.

    Looking at what I need exactly its...
  30. Re: Detecting for the presence of pulses not using interrupts

    I looked at the data sheet for the PCF8574, it seems it just generates an interrupt when there is a pin change. You have to then read it to figure out the pin that has changed.

    Considering the...
  31. Re: Detecting for the presence of pulses not using interrupts

    Thanks for both the suggestions. I'm going to look at the PCF8574 as that would mean I would not need so many wire back to the control board.
  32. Detecting for the presence of pulses not using interrupts

    I'm looking for a simple system to detect the presence or not of low going pulses.

    The task is to detect if a fan is still running. I do not need to detect the speed, just if its still rotating....
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    Re: Procedures in the 8-bit Proton Compiler

    Considering the benefits I get from Proton. You have my money every day of the week..

    Thanks so much for supporting the compiler.
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    Re: Advertisement on the forum

    I'm happy to donate and have adds.
  35. Thread: PICKitPlus Forum

    by Tim
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    Sticky: Re: PICKitPlus Forum

    May seem dumb but where is a link to a download?

    BTW I'm happy to donate and will do.
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