An other rain sensor, it consists of the typical rain sensor with the line shaped PCB where the rain falls, a microphone per-amplifier, an amplifier, a VU meter and a power supply to drive all the above.
The idea is simple, lets say you have no access to weather conditions but you want to know if it is raining. Not only that, but you would like to be aware on how strong the rain is
You can watch a video here:
.http://youtu.be/moz-xQcK9iA
VRS.MP43 MB
Remove these ads by
Signing UpStep 1: OPERATION
General idea
The rain sensor will become active at the presence of water drops. with the use of a relay then all other circuits will be powered.
Following, a microphone per-amplifier located under a reversed stainless steel bowl (acts like a bell), collects the sound of the rain drops. The amplifier multiply the signal from the per-amplifier and drive the VU meter where must be visible and most likely indoors, near you.
If it drizzle, some leds will light up but not all. If the rain is strong enough then all the leds will light up and with greater frequency. So, using this method one can have an idea on rain conditions.
This instructable is for one (1) set of pre-amp + amplifier + VU meter.
Visit Our Store »
Go Pro Today »
we live in the same country but i'm from Thessaloniki
The circuit you have made is quite interesting too.
The visual rain sensor have two purposes, the first one is to show in real time the rain's frequency and the other is the use of an analog command from the raley itself, say to activate a motor or something.