Full writeup here: https://unop.uk/dev/spark-core-shower-room-door-sensor/ and here: https://unop.uk/dev/spark-core-raspberry-pi-blinky-tape-awesome/
To get up and running:
- flash the firmware to the spark
- add your core ID and OAuth token to the web page
To use the Raspberry Pi and Blinky Tape information radiator you will need: