Should your agency wish to participate, on Sunday, May 5, 2024, at noon, many stations across the country will sound their sirens in honor of the fallen firefighters. Please notify your community ahead of time if you will join in this tradition.
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Firefighter Siren Sound Download
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I mean the sirens that every town used to have that called brigades of volunteers to action and to come to the aid of neighbors in need without question, whether it was a pile of smoldering mulch or a house set ablaze by too many extension cords on the Christmas tree.
As a dashing young reporter in Bound Brook, I remember the desperate banshee cries of the siren on an otherwise quiet February morning in 1985 when a paint factory exploded on Lincoln Boulevard in Middlesex. It was a sound that has stuck with me as much as the sight of 55-gallon drums launched 100 feet or more into the sky after I managed to get perilously near the scene.
This was in the days before 911 and radio dispatch so neighbors would call each other to see if they knew where the fire was. And then, if it was a bad one, members of the Ladies Auxiliary one by one would go to the firehouse and start making coffee for the volunteers who had been called to battle.
The sound of the fire siren rallied the town into action, an unity of purpose and duty that never needed to be explained or boasted. You just did your part because you knew, almost from birth and by example, what your part was in the community without nagging doubts or troubling questions. Cynicism vanished when the siren began to wail. And, to be honest, it was also a call to silent, modest prayer that those unselfish volunteers, available 24 hours a day, 365 days a year, would return home safe, exhausted with the unassuming pride that they've done their best to salvage a precious piece of our world.
Of course much has changed in a half century. Firefighters are alerted electronically by distant 911 operators. (I know that system is faster and more efficient, but why can't you still have the sirens?) Though some towns have retained their sirens, many have abandoned them and so the rest of the community is not aware when the firefighters are summoned to a call. And there is the fear that someday, perhaps in the nearer future than we may want to believe, volunteer fire companies, like their rescue squad counterparts, will be a hybrid operation of volunteers and paid members, if not eventually all-paid.
With more people working at home, you would think it would be easier to recruit volunteers to answer daytime calls, but the unavoidable and sad fact is that in the 21st century, people have closer ties through their computers with their corporations than they do with their communities.
And there was a time when businesses, aware of their obligations to the community because it simply was good business, tolerated - and sometimes encouraged - their workers to become volunteer firefighters or rescue squad members, even allowing them to take time off to fulfill their duties.
More than a half century ago, when computers were as common as flying cars, the Neshanic Fire Company didn't have a daily fire test, but a weekly test on Mondays at 6 p.m. The siren wasn't activated remotely, but by a button outside the engine bay doors. (There were other secret locations of the button around town where there were "fire phones" with a dedicated number where you could report a fire, no 911 then.)
Volunteers took turns going to the firehouse - now the Branchburg Library - to perform the test. One Monday it was my dad's turn and he took me with him. And when the hour came, he said I could push the button. The enormity of the task activated every cell of anxiety in my body. What if I goofed? Would I be be ridiculed for causing unnecessary chaos and worry? Would I live the rest of my life in shame?
I didn't screw up. I just pressed the button. And all over town and the open spaces beyond, our neighbors would pause, glance at their kitchen clocks to see if it were a test or the real thing, then settle back into their routine satisfied the siren was working and, quite literally, there was no cause for alarm.
You are not going to like this advice, I am sorry. This is not a beginner project. It would be a difficult project for the most advanced Arduino expert. It may well be too complex for Arduino uno or mega, requiring more memory and processing power than most Arduinos. An expert might choose a due, I don't know.
I'm also not certain how useful it would be. The human ear can pick up a siren several miles away and estimate its direction and distance, even in a very noisy environment. It would take some very advanced electronics to achieve a crude version of this.
I know it is a hard project for begginer like me but I really want to do this project to control traffic lights on junction point to open road when emergency vehicle approach to the intersection. Everyone knows that emergency vehicles have transition priority but somebody may listening to music loudly in their cars so couldn't hear the sound of emergency vehicles' siren and so on. That's why this project is vital for society. Who knows, maybe one day we can save someone's live with this project :-).
Hi Greensprings and thanks for your contribution. I think the strobe is suitable for dark environment not bright, dont I? The other question is that how radar detect the emergency vehicles? Thanks again.
The OP hasn't stated in which country he is, let alone which state.
Here, in the UK, different types of EV emit slightly different sounds (Police, Ambulance and Fire Brigade all have similar but distinct sirens) and all of them sound different to the ones used in the US, or so I've heard in TV programmes.
Also, our EVs are currently being fitted with a new type of siren which alternately produces about 5 seconds of high pitched and about 5 seconds of very low pitched sounds. A two-tone screech followed by a warbling deep bass sound. Even the deaf would hear/feel the low pitched sounds.
What's the bandpass filter center frequency ?
What's the lower cutoff frequency and the upper cutoff frequency ?
What's the decibel threshold for the microphone signal amplitude ?
The video in that link doesn't prove anything.
The cell phone was placed right next to the microphone with the volume on full. In real life, a siren is loud
up close but it would never trigger that cheap little microphone unless it was within 30 ft. and even then
it would depend on microphone placement. To discuss this project intelligently you need to start by posting
the Design Criteria with specifications. (ie: bandpass filter specs specific to a specific siren, sound level specs, total response time of the system etc...
Not all EV use the same signals. Within a 20 minute drive of my location, I can find a region that uses Infrared strobes to actuate the traffic signals, another that uses visible strobes, and a third that uses the audible siren sounds to trip the lights. And the sirens have to be of a specific tone/oscillation to trip the sensor. I spent many years as a paramedic (flight and ground), and the systems are specific to the city/county/region they are setup in. It depends on which manufacturer had the best sales pitch.
It is also very difficult to get exact info (I haven't looked in quite a few years though) on the specs for each system. 1) They are proprietary products of each manufacturer, and 2) It is illegal (in most places) to use such systems on non-authorized vehicles. Even authorized vehicles running just their opticon (the IR version I'm familiar with) without a good reason can get in trouble.
Another point: Any driver who is caring enough to want a detector, should be a good enough driver to have the situational awareness to notice an EV coming from a ways off. Installing a detector into a vehicle is just giving the driver an excuse to not pay attention. Any driver who normally wouldn't pay enough attention, doesn't care enough to think about this type of system. You should be checking every mirror and your gauges every 10-20 seconds or so. Reducing situational awareness is not a good idea. And those drivers who don't give a damn to start with won't even use the thing if it hits them in the face. I have followed drivers down the road for miles, (too) close to their bumpers blaring everything I had to get them to move.
Thirdly, at least in my local, yielding of right of way is NOT required. A motorist may continue on, at their pleasure, regardless of what an EV is trying to do, as long as that motorist would normally have right of way. That is why we are trained to stop at every red light and visually clear the intersection, I try to make eye contact with every first in line driver. Oddly enough, in my state an EV MUST yield to Mailmen and funeral processions (We're pretty sure that's why they died, the last ambulance had to yield to another funeral).
Side note on the use of Lights and sirens, On highways, EV's will only gain 3-5 seconds per mile running 'hot', and city driving they only gain about 10-15 seconds per mile, on average. The one report I read long ago, showed that running 'hot' only makes an actual difference in
Thirdly, at least in my local, yielding of right of way is NOT required. A motorist may continue on, at their pleasure, regardless of what an EV is trying to do, as long as that motorist would normally have right of way. 152ee80cbc
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