Roo’s been doing some open circuit board surgery on a doorbell so his house can twitter when it has visitors. By a stoke of luck (they were in the bargain bin when I needed one!) my doorbell flashes a light as well sounding a bell when it goes off:
Hopefully making it easy to hook up to one of these (when they’re available) with no chance of breaking the doorbell!
Notes from a small field 
If only the doorbell played ‘flashing lights’ when it rang, then all the stars would be aligned…..