Tilt/Bend lighting.

[idk]

Cool. The Pi may be the solution you are looking for. Cell phones also have gyros and accelerometers, so an old cellphone may be adaptable.

 

[barbagris]

Do you know anything about programming such a device (although I suspect there will be someone who has made a program for what you want, all sorts of things available.)

It won't be Rocket Science - I was machine code programming in the mid '70's. But it's that sensor board that clinches it. A 3x3 axis sensor array is a wonderful thing. plus compass - so one can tie Yaw and compass changes into the tilt equation. So it'll light going round corners and not when it falls over.

If I can tie in a GPS receiver we'll have "dead reckoning" too
.

 

[Loonitick]

Frankly, if my bike fell over, the lights coming on would be the last of my worries

 

[barbagris]

Frankly, if my bike fell over, the lights coming on would be the last of my worries

You don't want THE WHOLE WORLD to know - YEAH HERE I AM - THE TWIT THAT DROPPED THE BIKE.

 

[barbagris]

Guys - FYI the Raspberry Pi SENSE HAT is now available - horribly expensive - A whole 23 pounds.

The Pi solution is cumbersome BUT cheap - just about anything ancillary you can think of is available.
I will be pricing and ordering this month. But I have to speak to a Pi expert first - Yes he's a 16 year old.
How about a fingerprint reader ignition switch for example?

Ian - the problem with the old cellphone is getting it to switch relays.