Somebody may you design an ARDUINO ATMEGA 256 board for more advanced projects?

    • Micro USB instead of the huge USB connector
  1. – Chip clock i2c incorporated. Holes for optional backup battery.

    • Wi-Fi capability incorporated
    • Micro SD socket incorporated
    • Bluetooth capability incorporated
    • 0 to 15 digital pins free to use (NO 0=RX0, 1=TX0 that is a real problem)
    • 0 to 15 analog pins free to use (NO SDA SCL)
  2. – 5 Volt operation. The most modules works with 5V (and TTL chips).

  3. – All pins 22 to 53 just the holes inside board for optional use and reduce size board.

  4. – Very slim board to reduce project box space and a small board to reduce size final project.

Thanks for read the idea.

You might want to look at the DigiX. It doesn't quite tick all of your boxes, but it does for some.

It isn't shipping yet (it soon will be for the original kickstarter backers), and presumably by December, it will be shipping for non-kickstarter backers.

Here is the original kickstarter campaign: Be sure to read the updates pages as some things got added as the funding level increased.

Now, the DigiX runs at 3.3v, but you can purchase a level shifter shield that allows you to mount 5v Uno shields.

The basic specs include:

  • 84 MHz Clock Speed
  • 32-bit ARM Processor (AT91SAM3X8E)
  • On board 802.11b/g/n WiFi Module (FCC/CE Approved)
  • On board nRF24L01+ wireless module (removable)
  • 3.3V, 3.4-5.5V (LiPo Ready), 5V, or 6-16V input (onboard buck regulator)
  • 96KB SRAM
  • 512KB Flash
  • 1A @ 3.3V and 1A @ 5V Available (when powered at 5V+)
  • 99 I/O Pins
  • 12 PWM
  • 12 Analog Input
  • 2 Analog Output (DAC)
  • Onboard LED (connected to Pin 13)
  • 130ma Total Current Output from Processor
  • On-board EEPROM (added during kickstarter funding);
  • micro-SD card slot (added during kickstarter funding).

You have conflicting requirements. WiFi and Bluetooth will drive the board size larger. They and microSD generally need 3.3V levels, so you need to add level converters too - more chips.

Are there ANY bluetooth, wifi or SD cards that run on 5 volts?

5 volt chips and 5 volt signals are rapidly becoming obsolete. Only the low end of 8 bit microcontrollers (eg, AVR mega, but not AVR xmega) are 5 volts these days. Everything else has already gone to 3.3 volts or less.

[quote author=Paul Stoffregen link=topic=196705.msg1453310#msg1453310 date=1383482971] Are there ANY bluetooth, wifi or SD cards that run on 5 volts? [/quote] I don't know about wifi or SD cards, but you can still get HC-05 bluetooth transceivers that run at 3.3-6v. For example, this transceiver I got from a New York based ebay seller: I assume it has a voltage regulator inside of it.