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Recent content by larsof54

  1. L

    where can I get RGB color sensors

    I have looked extensively online but can't seem to find a source for RGB color sensors. Any suggestions?
  2. L

    IR multiple frequency separation

    There are 2 parallel beams and 2 receivers, separated by approx 5.25 inches and approx 56 inches between Tx and Rx. Color LEDs sound interesting to differentiate (distinguish) the 2 beams. from each other.
  3. L

    IR multiple frequency separation

    Unfortunately with battery operation I pretty much have to use an ultra low duty cycle with a high current to be able to receive at about 56 inches
  4. L

    IR multiple frequency separation

    Here's the whole picture. I wish to measure the speed of an object using 2 InfraRed beams that are approx 5.25 inches apart. So, detecting the absence of a pulse train is my method of seeing whether a beam is broken or not. For accuracy reasons I need to use frequencies of at least...
  5. L

    IR multiple frequency separation

    MODULATE: alter the amplitude or frequency of (an electromagnetic wave or other oscillation) in accordance with the variations of a second signal, typically one of a lower frequency : radio waves are modulated to carry the analog information of the voice. There is no second signal that...
  6. L

    IR multiple frequency separation

    There is no data and no modulation. Just pulses of the 2 different frequencies
  7. L

    IR multiple frequency separation

    so why wouldn't the receiver only see a series of irregular pulses? Why would it "see" the individual frequencies of IR?
  8. L

    IR multiple frequency separation

    Thanks Keith. I will give it a shot soon.
  9. L

    IR multiple frequency separation

    so if one of the beams was at 125 kHz and the other at 350 khz, I could separate them without trouble?
  10. L

    IR multiple frequency separation

    If I have two different frequencies of IR hitting a photodiode, can I use active filters to separate them? What I have is two parallel beams about 5.25 inches apart and need to isolate them from each other. The frequencies can be anywhere between 125 kHz and 400 kHz.
  11. L

    Is this project feasible?????

    I figured that 125kHz would do the trick. I could be out by 1/2 a cycle on either beam which gives me the .02 MPH error factor I'm after.
  12. L

    Is this project feasible?????

    Is this project feasible? I want to build a cue ball speed detector for when I break a rack of pool balls. I want to place a box on either side on the pool table sitting on top of the rails. The boxes are 6 inches long. One box will have a couple of IR emitters and the other box will have a...
  13. L

    How to drive IR LED using a FET

    I wired up an emitter follower test and it works like a charm. Thanks all for your advice and input LW
  14. L

    How to drive IR LED using a FET

    I'm hoping this schematic will work. Any thoughts?
  15. L

    How to drive IR LED using a FET

    I wish to pulse an IR LED at 2 MHz and 20% duty cycle. I have an AVR programmed to deliver that frequency and duty cycle. I tried using a 2N3904 but it maxes out around 1MHz. Would a FET be a better way to go? I was looking at a BS170. Any thoughts as to it's suitability? I have never used FETs...
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