What I had in mind

Pin Configuration

Name Description
RAW, VCC, GND RAW – Unregulated +5V to +12V
VCC – +5V or +3.3V
GND – Ground
UART(RXD,TXD)
SPI(MOSI,MISO,SCK,SS)
TWI (SDA,SCL)
UART & SPI – program the Pro Mini
TWI (Two Wire Interface) – connect peripherals.
ADC0, ..., ADC7
(8 Analog Pin)
Analog Input
OC0A,OC0B,OC1A,OC1B,OC2,OC2B
(3, 5, 6, 9, 10, 11)
Pulse Width Modulation output
RESET Reset MCU
INT0, INT1 (2, 3) External hardware interrupts.

FTDI USB-TTL

Connections

  1. FTDI USB-to-TTL: GND -> Arduino Mini Pro GND
  2. FTDI USB-to-TTL: CTS -> Arduino Mini Pro GND
  3. FTDI USB-to-TTL: +5Vcc -> Arduino Mini Pro VCC
  4. FTDI USB-to-TTL: TX  -> Arduino Mini Pro RX
  5. FTDI USB-to-TTL: RX -> Arduino Mini Pro TX
  6. FTDI USB-to-TTL: DTR -> Arduino Mini Pro DTR

  1. FTDI Driver
  2. Sparkfun - Using the Arduino Pro Mini
  3. How to modify an Arduino Pro Mini (clone) for low power consumption