The DFRduino Nano USB Microcontroller V3.1 (ATMega 328) is a breadboard ready version of the " Arduino mini" with integrated USB. The "Arduino Nano" has everything that the Diecimila has (electronically) with more analog input pins and an on-board +5V AREF jumper. The "Arduino Nano" automatically senses and switches to the higher power supply, so there is no need for a power select jumper.

The nano's pin layout works well with the Mini or the Basic Stamp (TX, RX, ATN, GND on one top, power and ground on the other). The DFRobot DFRduino Nano USB Microcontroller V3.1 (ATMega 328) can be powered via the mini-B USB connection, 6-20V unregulated external power supply (pin 30), or 5V regulated external power supply (pin 27). The power source is automatically selected to the highest voltage source.

 DFRduino Nano Projects:

Project 1. How to Make a Running Heart Alarm T-shirt

A DIY heart-rate wearable in a running t-shirt that vibrates when your heart-rate is high, using DFROBOT components.

Component List:

DFRduino Nano

vibration motor module for arduino

beetle

heart rate monitor sensor for arduino

Project 2.  A Good Idea to Express Your Love

How to make a great product to express your love? Today we teach you to make a gift to help you express your love, learn now!

Component List:

1. An empty perfume bottle x 1

2. DFRduino Nano x 1

3. 8 x 8 LED Matrix x 1

4. 9v battery connector x 1

5. 9v battery x 1

6. Magnetron x 1

7. Magnet x 1

Project 3: How to make a Fingerprint ID Nerf Gun

My initial plans were to have the DFRduino Nano on the side with the power-pack and have the fingerprint ID scanner on the left side of the gun so that it can read the thumbprint
Hardware components:
DFRduino Nano
Fingerprint Scanner
9g 180° Micro Servo    

Project 4:  How to Make Fingerprint Lock for Your Computer

Hardware components:

• DFRduino Nano
• Fingerprint Scanner
• Digital 10A Relay Module 

• v3.0 - improved the analog port pin mapping to be compatible with the original "Arduino Nano"
• v3.1 - changed the Mini USB port to Micro USB port

• Automatic reset during program download
• Power OK blue LED on the bottom
• Green (TX), red (RX), and orange (L) LED
• +5V to AREF jumper
• Auto-sensing/switching power input
• Small mini-B USB for programming and serial monitor (cable not included)
• ICSP header for direct program downloads
• Power OK blue LED on the bottom
• Standard 0.1” spacing DIP (breadboard friendly)
• Manual reset switch

• Microcontroller: Atmel Atmega328-20AU
• Operating Voltage (logic level): 5V
• Input Voltage (recommended): 7-12V
• Digital I/O Pins: 14 (of which 6 provide PWM output)
• Analog Input Pins: 8
• DC Current per I/O Pin: 40 mA
• Flash Memory: 32 KB (of which 2KB used by bootloader)
• SRAM: 2 KB
• EEPROM: 1 KB
• Clock Speed: 16 MHz

• WIKI

• DFRduino Nano x1