http://www.futureelectronics.com/en/Search.aspx?dsNav=Ntk:ManufacturerPartNumberUpshiftedSearch%7c*CY8CKIT%2f-042*%7c1%7c,Ny:True,Nea:True . In this lesson I will introduce you to Deep Sleep, which is a far more effective power-saving mode of the device. While it saves more power, deep sleep has fewer options for waking up. Deep sleep shuts down most of the hardware and so those interrupts cannot fire. One exception to that rule is the serial communication blocks. https://youtu.be/KParZKiiZLs