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  1. kennyden

    Ca I use a surface mount 0603 LED as a photodiode?

    I understand your point IRstuff. But again, I was hoping that someone would have had the experience of having two SMD LEDs successfully communicate with each other at any speed, any distances and by any means. I’ve seen similar demonstrations on youtube but none of them were using SMD LEDs...
  2. kennyden

    Ca I use a surface mount 0603 LED as a photodiode?

    Thanks Skogsgurra. You make it sound like something obvious. Have you ever used SMD LEDs as photodiodes in one of your projects? I understand why it acts as a photodiode but I guess I'am more concerned about how well it works in a real world application. So if anyone has ever used surface...
  3. kennyden

    Ca I use a surface mount 0603 LED as a photodiode?

    Hello guys, I understand from reading this great paper at "http://www.merl.com/papers/docs/TR2003-35.pdf" that an LED can basically be used as a light sensing device for communication (surprised don't you!?) Well perhaps some of U? So my question is: has anyone tried this using a...
  4. kennyden

    Database vs embedded systems (Excel or else)

    I found what I was looking for : "Database Designer 10.4L" from Ezyware. If you guys have a recommendation for another similar please feel free to let me know. Thanks Ken
  5. kennyden

    Database vs embedded systems (Excel or else)

    Hello xwb, Well, I'm not bad in C, C++, MFC and PHP/MySQL. However, I'm really trying to avoid this sort of programming. Besides, I don't really need database specific operations (shouldn't have mentionned the word "database" in my heading :() All I need really is for users to enter data in a...
  6. kennyden

    Database vs embedded systems (Excel or else)

    Hello, I'm new to VB in MS Excel and I have some very specific questions before I dig into it further. But first, here is basically what I'm trying to do : I need to upload data (such as dates, names etc..) to my embedded application which runs on a microcontroller. This uctrl has a USB host...
  7. kennyden

    4 layers VS 2 layers PCB cost AND carbon printing ?

    Don't get me wrong, I have worked for cies that were ISO9001 and the new one 9001-2000 (besides having been audited many times for these standards, which is BTW a pain in the... ) and ISO DOES NOT define a quality standard as such BUT at least you can audit your ISO customers and see if what...
  8. kennyden

    4 layers VS 2 layers PCB cost AND carbon printing ?

    Ooohh buzzp, now you're touching a very hot topic these days. I totally agree with you however just look around you and there's asian stuff all around. How do you think WalMart has gotten so big ? How about Nike, Home Depot and all the rest... Most of the stuff we buy these days from clothing to...
  9. kennyden

    4 layers VS 2 layers PCB cost AND carbon printing ?

    I will finally stick with a 2 layers PCB. I have managed to add some GND and VCC copper pours which will do the job compensating (as far as trace inductance goes) for the missing planes... However, I've shopped around and found that some Asian cies do offer 4 layers at about 50% more (compared...
  10. kennyden

    4 layers VS 2 layers PCB cost AND carbon printing ?

    Thanks nbucska.
  11. kennyden

    4 layers VS 2 layers PCB cost AND carbon printing ?

    Yep, these were my numbers too. There was a myth circulating here that it was not that much more expensive. I just wanted to put a number to the "that". I think I'm gonna stick to the 2 lyrs unless I really need to do otherwise. Thanks buzzp. BTW, anyone knows of a good PCB fab that does...
  12. kennyden

    4 layers VS 2 layers PCB cost AND carbon printing ?

    Hi, Question #1: I'm currently using a 2 layers board for my prototype. Obviously, the design would be much cleaner if I'd be using 4 layers. However, having a seprate ground and power plane for a 6 inches sqr PCB is what I beleive to be luxury. Nevertheless, how much more should I expect to...
  13. kennyden

    Calculating battery life

    Thanks, TTFN. I've asked some manufacturers for more specific data as neither of them consider "very low" current discharge. Obviously, self discharge will become important in such low power apps, but how important will this be, that was my initial question really about. All self-discharge...
  14. kennyden

    Calculating battery life

    Yes, 50787 joules is what I can get from 3 times 1.5 volts AA batteries. So basically what I'm trying to say is, the rating I got from 3 batteries @ 3135mAh times 1.5 volts is 14.1 Wh which gives a theorical life span of 8 years are so. You said that the ratings you had were in Wxh and are at...
  15. kennyden

    Calculating battery life

    First, thx for your quick reply. Have you extracted this data from their specification curves or did you get this data elsewhere ? Are you saying 4 watts per 1.5 volts battery ? 1.5 X 3135mA/h is about 4.7 watts for an hour (or possibly 4 watts nominal taking into account battery discharge)...
  16. kennyden

    Calculating battery life

    Hi, I'm trying to calculate the service life for my battery powered application. Here's how I calculate it. Please le me know if this the right way to do this. I'm using 3X1.5 Volts AA type alkaline batteries -put in series- (energizer titanium e2) rated at "3135mAh (down to 0.8 volts)". My...
  17. kennyden

    How to calculate battery life for specific application

    Hi, I'm trying to calculate the service life for my battery powered application. Here's how I calculate it. Please le me know if this the right way to do this. I'm using 3X1.5 Volts AA type alkaline batteries -put in series- (energizer titanium e2) rated at "3135mAh (down to 0.8 volts)". My...

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