Hi, I am new to this forum but need some help.
On our marina we have a problem with birds perching on the top of masts and making their mess on the deck below. I have had success with a mole scarer that emits a 500Hz pulse (buzz) for a few seconds every minute. It is hoisted to the top of the mast and the birds don't like it and go elsewhere. However it is overkill and sounds 24/7 and annoys us and the neighbours when they sit out in nice weather.
I want to use a transmitter from the house, nearby (50m), to send a pulse of sound that switches the receiver on the mast out of sleep mode (low currrent drain from internal battery), passes the audio pulse (2-5 secs duration) to an amplifier and loudspeaker. I can then control the transmitter to come on for a couple of hours at dawn and an hour at dusk (the worst times) or when we see birds there.
It could be based on PMRs from Maplins or their 433Mhz Transmitter Receiver modules. The PMR approach would probably use too much current (I want the battery to last 1-2 months) but the TX RX modules look good as they sleep but how can I make them transmit and receive audio? Or is there another approach. Any help or ideas would be much appreciated.
On our marina we have a problem with birds perching on the top of masts and making their mess on the deck below. I have had success with a mole scarer that emits a 500Hz pulse (buzz) for a few seconds every minute. It is hoisted to the top of the mast and the birds don't like it and go elsewhere. However it is overkill and sounds 24/7 and annoys us and the neighbours when they sit out in nice weather.
I want to use a transmitter from the house, nearby (50m), to send a pulse of sound that switches the receiver on the mast out of sleep mode (low currrent drain from internal battery), passes the audio pulse (2-5 secs duration) to an amplifier and loudspeaker. I can then control the transmitter to come on for a couple of hours at dawn and an hour at dusk (the worst times) or when we see birds there.
It could be based on PMRs from Maplins or their 433Mhz Transmitter Receiver modules. The PMR approach would probably use too much current (I want the battery to last 1-2 months) but the TX RX modules look good as they sleep but how can I make them transmit and receive audio? Or is there another approach. Any help or ideas would be much appreciated.