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  1. Arouse1973

    Are deep red 660nm LEDS completely safe?

    As I said any light source too bright has the risk of damaging the eyes. Manufactures of products that use bright LEDs have a duty by law to state any exposure limits for eye safety. What are you trying to do? Why the concern. Adam
  2. Arouse1973

    Are deep red 660nm LEDS completely safe?

    All light sources have the potential to be harmful to the skin and eyes. The LEDs that most people are concerned about UV, Blue, White, IR and NIR. Your LED may not fall within this scope but if powerful enough it may be emitting some NIR powerful enough to cause eye damage. You need to check...
  3. Arouse1973

    Battery charge/discharge circuit

    Let me have another look sometime tommorow. I'll let you know. Just couldnt see a charge button. Adam
  4. Arouse1973

    Battery charge/discharge circuit

    Looks like it work the other way. When you press the switch it latches A2 which starts to discharge the battery, when the battery voltage has gone low enough set by resistors at the bottom of the circuit diagram then A1 resets the discharge circuit and the timer via C2. The timer will also...
  5. Arouse1973

    Battery charge/discharge circuit

    So it looks like its either charging or discharging. If you dont press the discharge butoon it will charge, is this correct? Adam
  6. Arouse1973

    Battery charge/discharge circuit

    Ok so SW1 is the discharge switch is it?
  7. Arouse1973

    Battery charge/discharge circuit

    Ok what do you know so far? What are the bit you are not sure of? Adam
  8. Arouse1973

    Design and implementation light controlling using a human speech

    What have you done so far. Apart from asking us to design the hardware and software for you. Show us what you have done so far. Adam
  9. Arouse1973

    Make a nonlinear tachometer into a linear (homemade)

    Ok good luck
  10. Arouse1973

    Battery charge/discharge circuit

    Hello Eoin Why are you doing this? Job interview is it? Why would you be asked to do this? can someone turn it up the right way, its difficult to follow on its side. Thanks Adam
  11. Arouse1973

    Make a nonlinear tachometer into a linear (homemade)

    Glad to see you have something working. It would be worth looking at a magnet and reed switch with a frequency to voltage converter, you may find this more accurate. Adam
  12. Arouse1973

    Make a nonlinear tachometer into a linear (homemade)

    That's the sort of thing. But I guess we need to find out why your RPM gauge is not showing a linear sweep first. Can you post the information for the gauge you are using? Adam
  13. Arouse1973

    Make a nonlinear tachometer into a linear (homemade)

    It's not that complicated they do a chip that does it all for you. Answer to the other question is yes, it's called a VDR(Voltage dependant resistor). But these normally don't have a very useful range which is why they are used for surge suppression, there other name is a Varistor...
  14. Arouse1973

    Make a nonlinear tachometer into a linear (homemade)

    Guten Abend Harald. Yes I agree its worth understanding a bit more. Adam
  15. Arouse1973

    Make a nonlinear tachometer into a linear (homemade)

    Hello Have you looked at frequency to voltage converters? Adam
  16. Arouse1973

    Rest in Peace, Kris

    Great song Chris, you are so right. "It's not what you take when you leave this world behind you. It's what you leave behind you when you go" Adam
  17. Arouse1973

    Microcontroller controlled by pushbutton for LED flashlight

    Hi Hop The old mplab has an in built simulator I used to use alot. You could step through your code and use watch windows to see the registers change. You could also set inputs high and low to see what the code does. I have not needed to use this in mplabx but google it you might get some...
  18. Arouse1973

    Electronics engineering

    Dont eat yellow snow. :)
  19. Arouse1973

    Microcontroller controlled by pushbutton for LED flashlight

    Hey Hop Well at least your having a go, yeah using the 320 allowed me to write the code how I planned it in the first place, didn't realise the 200 was so basic until @BobK told me. I know someone like Kris would have done this easily with the 200 but my pathetic software skills drew a blank...
  20. Arouse1973

    Rest in Peace, Kris

    Thank-you Donna for taking the time to contact us letting us know what happened to Kris. As you can see he had a huge following here and his knowledge will remain here for years to come educating others which was something he loved to do. Thank-you for the pictures of you both and oh he liked...
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