I've finally completed my project using the Arduino and the wave shield.
Really enjoyed this project, from learning to solder to playing around with code a bit more complex to what I was used to.
I did struggle with joining code from the PIR sensor with the code for the wave shield.... thank goodness for the internet :-)
The aim of the Flush-a-Vader is to remind toilet users not to flush anything but toilet paper once they have finished their business.
In the UK we are getting issues in the sewage network and treatment works cause by blockages by 'flushable' wipes and other disposables such as cotton buds.
Thanks for all your comments and advice :-)