Arduino library which allow to decode characters on J1850-PWM mode. It works with wire, radio and laser transmissions. You just have to choose your bit-rate (lower is better), tx and rx pins. It doesn't have either a header nor a parity check. These functions could be implemented at a higher protocol layer. It doesn't detect SOF (start of frame) and EOF (end of frame) yet.

Required libraries:

1. DigitalWriteFast (Tested with version 1.0.0, Download: https://github.com/watterott/Arduino-Libs)
2. EnableInterrupt (Tested with version 0.9.5, Download: https://github.com/GreyGnome/EnableInterrupt)

This library has been tested with:

1. Wire connection between two Arduino
2. Radio connection (multipoint) with FSK modulation (and OOK too), module RTX-MID-868. Datasheet: https://goo.gl/UEv8ii
3. Laser connection (experimental circuit)

In order to keep the transmission medium free (ether) after transmission, it is recommended to use the "setTxRxModePin" method (see example sketch "Advanced_TX"). The "mode_pin" is connected to the radio module and is used to choose the transmission directions (to select transmission or reception, see datasheet of RTX-MID-868 module https://goo.gl/UEv8ii).