Using a photo-cell to trigger Twine (two ways)
1) I connected a simple photo cell to the contacts of the moisture sensor, and it accurately responds to light shinning on it, showing "wet" when the light is on.
2) The same experiment worked when the photo cell was connected to the GND and IN points on the Breakout Board. Light will cause the switch to close.
This should make it easy to extend the uses of Twine.