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  1. Steve Peart

    Cheapest way to get data from multiple(100s) of sensors?

    @dorke, @BobK : The ULN2803 just boosts the signal from each input to each output, right? That way it will be able to drive the whole row? Would I still need to have a shift register for selecting which row I want to drive in front of it? On bit from shift register (0) -> ULN2803 (0) -> Row...
  2. Steve Peart

    Cheapest way to get data from multiple(100s) of sensors?

    @BobK , I am confused. I would think that if the matrix is causing only one of the sensors to be active, then how is the signal being reduced by the total count of sensors in the row? @dorke 's idea mentions powering the row of 20 IR LED's that are used for detecting the reflection, but only one...
  3. Steve Peart

    Cheapest way to get data from multiple(100s) of sensors?

    Definitely plan to try a smaller matrix, just so the logic is simpler to understand as I go. I want to make this as modular as possible, so as I want to throw more $ at it, I can make the table larger, etc. I may just go with a 10x10 grid and if it's modular enough, expand it as I see fit. I...
  4. Steve Peart

    Momentary Ground - > Need to toggle sending of ground between two wires

    I guess it's more complicated than I would think it needs to be. I think if it's meant to be one wire interrupted, you could install some circuitry that switches which one it's affecting so as to only need one of these for both roll-up and roll-down. Doing this with an Arduino would be very...
  5. Steve Peart

    Momentary Ground - > Need to toggle sending of ground between two wires

    What is the device that rolls up and down the window? Why would you need 2? I don't know much about car windows but I would think there's just one motor that jacks the window up or down, without the need for 2 mechanisms.
  6. Steve Peart

    Cheapest way to get data from multiple(100s) of sensors?

    @dorke So post #18 has "sunk in" a lot more now. Couple questions: Will one ULN2803 run the load for up to 8 of the rows? Or is it one per row? What types of circuit protections/diodes and or capacitor smoothing would you add to this if any?
  7. Steve Peart

    Cheapest way to get data from multiple(100s) of sensors?

    So from @dorke 's diagram, you are saying I would need a different Shift Register IC to read the analog values from those sensors? I shouldn't need a different shift register for the drive rows, since that's just power on/off for the row. Can you recommend an analog multiplexer IC for this purpose?
  8. Steve Peart

    Cheapest way to get data from multiple(100s) of sensors?

    1. Sorry, I was asking about lighting all of the RGB LED's all at once, then realized you're matrix is referring to the IR LED's only. 2. I read the datasheet but I hadn't looked up the circuit diagram symbols. I haven't committed them to memory yet. I think I am all set there, but the LEDs DO...
  9. Steve Peart

    Cheapest way to get data from multiple(100s) of sensors?

    Yes, but I noticed they spin around with minimal prompting, so it's tough to know which wire is which, especially with the darker one where you cannot see the insides.
  10. Steve Peart

    Cheapest way to get data from multiple(100s) of sensors?

    Couple more questions: I want to be able to control the value of each LED separately, like an LED cube. Will this also be possible in the setup or do i have to run 20 at a time on or off? Where does the shift register attach in your diagram? Right at the drive row lines that go all the way...
  11. Steve Peart

    Cheapest way to get data from multiple(100s) of sensors?

    So with this setup, is it possible to potentially have all the LED's lit up at once? Sorry if I haven't been understanding what you've been saying. I need to brush up (a lot) on reading circuit diagrams. I don't want to just run with a circuit someone hands me. I want to understand it. That's...
  12. Steve Peart

    Cheapest way to get data from multiple(100s) of sensors?

    Yes, but mine aren't using those resistors, would that make a difference? Or is the signal just ok now given i am testing with just three of them? I figured that if the other sensors had 0 voltage/current going through them, that they wouldn't even be considered in the overall measurement. In my...
  13. Steve Peart

    Cheapest way to get data from multiple(100s) of sensors?

    Here's my quick and dirty representation. The left register is the simpler LED manager. The right register manages the powering of the IR Sensors, which all pass through to the Arduino analog input. Having only one of those flipped on reads the analog measurement for that sensor. Does this...
  14. Steve Peart

    Cheapest way to get data from multiple(100s) of sensors?

    I think I may have cracked this! At least, I have something that seems to be working. I have 2 shift registers, neither of them are used to read input from the sensors. I have grounded all of the sensing LED's to each other, and run them all down a single Analog input on the Arduino. The IR...
  15. Steve Peart

    Cheapest way to get data from multiple(100s) of sensors?

    I suppose "all at once" is relative. I don't mind having to read them linearly, then making whatever decisions for them as I go. Within 10ms would be totally fine. I am still reading the other posts to wrap my head around them...
  16. Steve Peart

    Cheapest way to get data from multiple(100s) of sensors?

    @Harald Kapp I have been reading up on this, will the software still be able to read the varying proximity data from the shift register, or will it have to be a basic on/off being read? Currently, these sensors appear to have a granularity of about 30 from the Arduino, meaning I should be able...
  17. Steve Peart

    Cheapest way to get data from multiple(100s) of sensors?

    Sorry for not being more clear. The sensors I am currently using (could be changed, just testing so far) are titled this: "TCRT5000L TCRT5000 Reflective Optical Sensor with Transistor Output Infrared 950mm 5V 3A" I am attempting to build a small table filled with 5050 RGB Led's and IR sensors...
  18. Steve Peart

    Cheapest way to get data from multiple(100s) of sensors?

    Also, I need to be able to read them async. I won't know which one is which if i just hook them all up together, right?
  19. Steve Peart

    Cheapest way to get data from multiple(100s) of sensors?

    They are Reflective IR Sensors. I want to be able to respond to them individually, but need to know which one is changing when it does.
  20. Steve Peart

    Cheapest way to get data from multiple(100s) of sensors?

    Hey team, I am an electronics beginner/novice. Currently working with an Arduino UNO (though that isn't necessarily the only thing i'd want to use for this). I plan to have 100s of Reflective IR Sensors and want to be able to read from all of them at once in the cheapest way possible...
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