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  1. OnOff

    Need help!

    If you are not familiar with electronics it will be very deficult to guide you to build your project which is very simple and nice. So I advise you to get some electronics guy to do the electronic part, and you may do the visualization part.
  2. OnOff

    help

    AHA, now I got the point, I thought it was a toy car.... - You can put a speed meter to show the car speed. - Ofcource break lights are abvious.
  3. OnOff

    Random LEDs, random time on/off?

    If you are not familiar with micro controllers, then the 555 timer will be a good solution, but your idea states that each timer will drive 2 LEDs so you need 32 timers (WAW, a very large and mesy board), so there are two solutions: 1- Use a micro controller (ATtiny2313 as I suggested before)...
  4. OnOff

    help

    you can provide your car to give signal when turning left or write if it does turn. By the way, is it a remote controlled car or what..?
  5. OnOff

    usb powered device

    Well, if you have to use the serial port for data transmit, then you can use the USB port to power supply your circuit, and 100mA is enough since a wireless receiver does not consume much power as a transmitter. If you run your Atmel with low frequency (1~4 MHz) and low voltage (2.7~3.3v) it...
  6. OnOff

    UVB Meter

    I found the UV sensor 6490, I hope it does fit your need.
  7. OnOff

    UVB Meter

    If you google for "UV sensor" you will find many many choices amongst you can choose the appropriate one that is available in your area. Then use a uController to set the desired UV level.
  8. OnOff

    usb powered device

    Why don't you use the USB port for trasmiting the data instead of the RS232 port, here is a PDF doc. that describes how to do that: URL http://www.atmel.com/dyn/resources/prod_documents/doc2556.pdf The source code is even there: http://www.atmel.com/dyn/resources/prod_documents/AVR309.zip I...
  9. OnOff

    Random LEDs, random time on/off?

    You can use a microcontroller and program it to generate a random number. If you are saying that you have an 8x8 square of LEDs an ATtiny2313 would be fine or ATmega8 if you want to have more free pins to do fancy thing with them. I hope this gives you a clue, if more help is needed just tell me.
  10. OnOff

    AD/DA modules

    Hi everyone, I need a single chip that contains an ADC and a DAC at the same time. I found the AD7569 chip from "Analog" which is fine: (8 bit, parallel, AD/DA) But is ther any other options!!?? - The interface does not matter (serial or parallel) - 8 bit res. is enough.
  11. OnOff

    Help needed for making a pinball machine.

    This is a very simplified design just to give you an idea. You may use any cheap micro. If the 7seg is CC then you should use BC337 instead of BC327. If you need more help tell me.
  12. OnOff

    Assistance IDing this temp sensor

    I think thermo-switch could be a good name
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