The USB to RS-232 Converter is a self powered usb to DB9 serial port adapter.
Basic breakout board for FTDI's popular USB to UART IC. Now with internal oscillator and EEPROM, the FT232RL is an impressive IC!
Need to add a virtual COM port to your PC? The TTLyFTDI adapter plugs onto your USB mini-B cable, and breaks out all the standard lines for Arduino-type TTL communication!
This board can do it all - breakout the Synapse RF module pins, give you a USB port/FTDI chip to program, supply it with a regulated 3.3V, integrate a reset switch (for updating & erasing), and also give you mounting options.
Because the Arduino (and Basic Stamp) are 5V devices, and most modern sensors, displays, flash cards and modes are 3.3V-only, many makers find that they need to perform level shifting/conversion to protect the 3.3V device from 5V.
The SparkFun logic level converter is a small device that safely steps down 5V signals to 3.3V and steps up 3.3V to 5V. This level converter also works with 2.8V and 1.8V devices.
The RS-485 wiring standard & protocol is very well established for industrial applications, and the Devantech USB-RS485 lets you bridge this easily to your PC's USB port!
Using the FT232RL, the Arduino Serial USB Board shows up as a com port allowing serial communication to and from the Arduino Stamp or any other serial device.
Designed to replace RS232 serial cables. A Bluetooth Class 1 device with up to 100m range (free space). Easy to setup and configure using LM Technologies LM049 user interface.