External FTDI USB-to-Serial Converter
(Sparkfun FTDI Basic Breakout 5V)
The FTDI chip converts between serial and USB (universal serial bus). Your computer
will display the FTDI as a virtual serial port (DB9 port). Arduino programs can be
installed directly to the ATMega 328P-PU microcontroller via the FTDI. Use it
with a breadboarded circuit or your printed circuit board controller. DTR automatically
resets when a new program is downloaded. Flashing surface mounted LEDs for TX and
RX verify that the FTDI is working. Use a micro-USB cable. The Ardunio Uno
programmer has either an Atmel 8U2 or 16U2 chip for USB-to-serial conversion.
1. Sparkfun tutorial
www.sparkfun.com/products/9716
2. Drivers
Install drivers on your computer (Ubuntu, MS Windows)
to communicate with an FTDI serial-to-USB adaptor.
www.ftdichip.com/FTDrivers.htm
http://learn.sparkfun.com/tutorials/how-to-install-ftdi-drivers?
3. FTDI Acronym Definitions
DTR
RXI
TXO
5V
CTS
GND
Data Terminal Ready
Receive
Transmit
Power
Clear To Send
Ground
4. Pin Connections
FTDI
ATMega 328P-PU
DTR
RXI
TXO
5V
CTS
GND
Pin 1
Pin 3
Pin 2
Pin 7
Pin 8
Pin 8
(PCINT14/RESET) PC6 1
(PCINT17/TXD) PD1
(PCINT16/RXD) PD0
(VCC)
(GND)
(GND)
Arduino Uno
Reset (use with 0.1 μF capacitor)
TXO
RXO
5V
Ground
Ground
If pins 2 and 3 are already used by another device,
new TX and RX pins can be declared. CTS would
then be reassigned from pin 8.
TG 02.01.2015
1
Use a 0.1 μF capacitor. Visit this link for an illustration.
www.instructables.com/id/BaW-Bot-Part-1-Build-an-Arduino-on-a-Board/step5/connect-the-FTDI-board