Radio Proximity Cat Collar alarm.
Hi there folks..
My brother has a chicken coup ,that is forever being worried by his cats . (He loves cats so they stay
He'd like to know if its possible to mount a low power radio transmitter that will activate a collar mounted buzzer when the cat collar gets within a 20ft radius the coup.
I took a couple of transmitter / receivers I use in the 433Mhz and 856Mhz range and one of the cheap 315Mhz pairs on half voltage , and all have a far to big a radius in free air.
I also thought about using a bluetooth or zigbee type chipset that could give me a carrier signal strength detection value/threshold ,but haven't found one so far..
To Sum up .. Looking for very low power transmitter and a receiver small enough to fit a cats collar.
Any Ideas ..