Furuno radar buzzer mod

[markxengineerin]

It works beautifully-
https://youtube.com/shorts/-W859BLIa7Q
anytime the weak furuno alarm goes off, it is sensed by the microphone then repeated by a much louder alarm, as long as I have the system powered up.

Since I was in there, I also added a pressure sensor to the Spectra watermaker feed, and alarm for that at a different frequency if that pressure drops below 40psi for more than a couple seconds. I just ruined a brand new Procon feed pump by cavitation after repeatedly drawing air into the system in rolling seas, this should remind me not to do that again.

Components used, all purchased from MPJA
Arduino UNO R3
35077 Analog Sound Sensor Module (microphone switch)
34653 Single 5V SPDT Relay Board (to drive the more powerful buzzer)
30148 LM2596 Step Down Adjustable 1.5-37V DC/DC Converter (to power Arduino)