Arduino 3.3V/8 MHz Version PRO Mini Kits With Atmega**8

Useful Tips:

Because the Arduino PRO mini and Arduino Mini USB Adapter are separate, there is no reset circuit on Arduino PRO mini. So there sometimes may happen this accident like yours.
There is an skilled way:

First holding the reset , then release reset immediately when the LED of TX RX first flashing, and then you can download the code to your Arduino PRO mini smoothly.

Arduino PRO mini **8

The Arduino PRO Mini is a microcontroller board based on the ATmega**8 (datasheet). It has *4 digital /output pins (of which 6 can be used as PWM outputs), 6 analog s, an on-board resonator, a reset , and holes for mounting pin headers. A six pin header can be connected to an FTDI cable or Sparkfun breakout board to provide USB power and communication to the board.

The Arduino PRO Mini is intended for semi-permanent installation in objects or exhibitions. The board comes without pre-mounted headers, allowing the use of various types of connectors or direct soldering of wires. The pin layout is compatible with the Arduino Mini.

There are two versions of PRO Mini:

One runs at 3.3V and 8 MHz

The other at 5V and *6 MHz

And this kit is Arduino 3.3V/8 MHz PRO Mini Kits With Atmega**8

The Arduino PRO Mini was designed and manufactured by SparkFun Electronics.

It's blue! It's thin (0.8mm)! It's the Arduino PRO Mini! SparkFun's minimal design approach to Arduino. This is a 3.3V Arduino running the 8MHz bootloader (select 'Arduino Duemilanove w/ **8' within the Arduino software). Arduino PRO Mini does not come with connectors populated so that you can solder in any connector or wire with any orientation you need. We recommend first time Arduino users start with the Duemilanove. It's a great board that will get you up and running quickly. The Arduino PRO series is meant for users that understand the limitations of system voltage (3.3V), lack of connectors, and USB off board.
We really wanted to minimize the cost of an Arduino. The Arduino PRO Mini is like the Arduino Mini (same pin out) but to keep the cost low, we used all SMD components, made it two layer, etc. Connect the mini PRO to your PC using the Arduino USB-serial.

Parameter:

Operating Voltage 3.3V
Input Voltage 3.*5 **2 V
Digital I/O Pins *4 (of which 6 provide PWM output)
Analog Input Pins 6
DC Current per I/O Pin *0 mA
Flash Memory *6 KB (of which 2 KB used by bootloader)
SRAM 1 KB
EEPROM **2 bytes
Clock Speed 8 MHz

Features:

* ATmega**8 (*6K) running at *6MHz with external resonator (0.5% tolerance)
* USB connection off board
* Supports auto-reset
* 5V regulator
* Max **0mA output
* Over current protected
* Reverse polarity protected
* DC 5V up to *2V
* On board Power and Status LEDs

Dimensions:

* 0.7X1.3" (*8X*3mm)
Mini USB Adapter:

This board converts a USB connection into 5 volt TX and RX that you can connect straight to the Arduino Mini or other microcontrollers, allowing them to talk to the computer. It is based on the FT**2RL chip from FTDI (drivers are included with the Arduino software).

Photo of an original Mini USB Adapter

Pinout of the original Mini USB Adapter

Pinout of the revised Mini USB Adapter
Attach: Mini_USB_schematic. Pdf

Connecting to the Arduino Mini
See the guide to the Arduino Mini for information on connecting the adapter to the Mini.