Just a quick note to beware of, do NOT use println() in your ISR for the os_timer
I wasted an ENTIRE day by not reading this tutorial...
http://www.switchdoc.com/2015/10/iot-es ... duino-ide/
Im just posting it here so someone else doesnt get caught.
I kept getting exceptions being thrown.
Loving ESP and loving all your hard efforts!
Regds
Paul