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Posts posted by OnOff

  1. 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) if you know how to program one. And the board will be simple and prety. The datasheet of this uCont. is found onthe Atmel's web site "www.atmel.com"

    2- Or use two 8bit counters and two 8bit buffers (or one 16bit) and a timer, but in this case YOU have to connect the LEDs to the counters in such a way that when they count (up or down) the LEDs will look like switching randomly. The timer will drive the counters and you can use a variable res. to play with the speed of switching.

  2. 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 will consume current in nAmps.

    More over new USB ports are high power load this means they can supply 500mA.

    But trying the circuit given by "MP" won't be useless, try to get rid of any un-necessary elements. Then, maybe 5~7 mA is enough.

    Good luck

  3. 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.

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