and a complete solution using a standard RS-232 cable:
SparkFun RS232 Shifter - SMD https://www.sparkfun.com/products/449
@Robin started
Espruino is a JavaScript interpreter for low-power Microcontrollers. This site is both a support community for Espruino and a place to share what you are working on.
and a complete solution using a standard RS-232 cable: