The Extended Proto Cape provides more prototyping area for the BeagleBone Black. Users can still have access to the extra areas on each side of the BeagleBone Black's expansion headers even when another cape is stacked. Signals from the expansion headers are also broken out to edges of the PCB.
The RTC Cape provides time tracking capability for the BeagleBone Black even when the power is lost. This cape features the DS1338 I2C-based real-time clock/calendar and a holder for a coin battery type CR2032. Setup, reading, and setting up time is easy with the provided device tree overlay.
The PWM Cape provides 32 channels of PWM output, addressed over an I2C interface. The three pin connectors are wired in a standard servo pinout, and power to the connectors can be provided from a screw terminal block on the end of the board.