@Dan,
I am retired so I have some time in between babysitting my two granddaughters.
As I said in my previous post I shall now go and buy some sensors and see what happens. I already have some 433Mhz stuff kicking around. Got a box or ATMega and AT Tiny chips too. I’ll see what I can do in the next few weeks as stuff gets delivered and I cobble it together.
UPDATE: I just ordered two Vegetronix VH400 sensors that you are using
