Coming out of lurk mode…
I’m looking at the best way of implementing sensors for a ringing
simulator for church bells. The bells are swung via a rope that runs
over a wheel (think cart wheel) attached to the bell itself. Current
sensor systems use serial interfaces, which of of course virtually no
PCs have any more and which therefore require an intermediate
usb-to-serial converter. The obvious thing is just to replace that
with a USB-capable AVR with the sensors connected directly to the AVR.
That bit is relatively straightforward.
The bit I’m looking for suggestions for is the sensors themselves.
There will be 8 bells, and there are 3 main sorts of sensors that are
Reed switches. Generally not a good solution as they need to be
close to the magnet to work which is difficult with 100+ year old bell
wheels which are often warped.
Tuned circuit, similar to metal detectors. Not clear if the
components can still be sourced, and seem a bit fiddly to make.
The other thing I’ve looked at is a TTL-compatible IR sensor that has
an amplifier and schmitt trigger all in one package:
That looks like it would be a mimimal-component solution and that
would be easy to debounce etc.
Anyone have any thoughts, or better suggestions?