Motion triggered audio |
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4D
Old Croc Joined: 13 November 2008 Location: Winchester Status: Offline Points: 4257 |
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Posted: 05 September 2017 at 4:17pm |
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Hive mind...
I have been asked to do a Halloween show with audio samples triggered as people move around between different rooms. I see some Pir based audio devices for folk with dementia available on eBay but they Look pretty plastic anyone have any clues ? Thanks |
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DMZ. "The bass was intense. Girls were literally running up to stand next to the subs"
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dylan-penguinmedia
Old Croc Joined: 14 April 2011 Location: Brighton Status: Offline Points: 4576 |
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Few ways we've done it before...
Arduino / Raspberry Pi control Crestron control You could also use a Qsys system which handles playback on board and the GPIO to fire off tracks. |
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4D
Old Croc Joined: 13 November 2008 Location: Winchester Status: Offline Points: 4257 |
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I have been intrigued by this Arduino Raspberry pi business but not found time to get acquainted. How would that work ? Edited by 4D - 05 September 2017 at 7:59pm |
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DMZ. "The bass was intense. Girls were literally running up to stand next to the subs"
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dylan-penguinmedia
Old Croc Joined: 14 April 2011 Location: Brighton Status: Offline Points: 4576 |
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Think of it as a tiny computer, but with a bunch of GPIO pins that are a handy way to get switch contacts, PIR sensors etc to operate scripts you've written on it.
So if something happens, i.e. A switch has been flicked, or a beam has been broken, play an audio track off the SD card. Because of its nature, people have developed all sorts of daughterboards to do DMX control etc - some of it is pretty basic but can be used as an inexpensive show control toy. We've used them for loads of things, video playback when a switch is pressed for safety briefing in a trampoline park, or like the service call im off to this morning, effects control for an adventure golf course. (Hit the ball down the tube, when it passes a sensor it triggers a few DMX lights, plays some sound effects and fires off an IP rated smoke machine on a relay board). |
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odc04r
Old Croc Joined: 12 July 2006 Location: Sarfampton Status: Offline Points: 5483 |
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To give another example I used a GPIO pin on a Pi to count a pulse train via a relay from an old american wallbox. Once it decoded the pulse train it then sent a remote command to a lightweight music player also installed on the Pi that played the relevant track.
The Pi is just a tiny linux PC with GPIO (General Purpose Input Output) pins available to the user. You can access them via many langauges such as C or Python, or there are higher level programming libraries available which hide a lot of the programming gore when your timing requirements are less severe. E.g. milli-second required instead of micro-second response. The main advantage of a Pi is that without any extra effort you have available a HDMI port for audio and video output, plus all the advantages of a high level OS such as media player software being readily available. The disadvantage is that you will have to get your hands dirty to some extent soldering, installing your Pi software, and writing scripts. Probably there is a lot of published code out there that you could make small alterations to and re-use to save time and headaches. I'm potentially up for such jobs, if there is a budget in it then feel free to PM me in future. Don't think I have any time before this Halloween though unfortunately. |
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MattStolton
Old Croc Joined: 04 September 2010 Location: Walthamstow Status: Offline Points: 4234 |
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Id-Al do a range of players from flash cards, with triggers for playback. http://www.id-al.com/home2/en/products/audio-players
Short between Gnd and P1 and Folder 1 plays. Short between Gnd + P2, Folder 2, Gnd+ P2+P1 - Folder 3, i.e. binary to 16. Equally you can leave a text file in the root of the card, which tells it what to do, i.e. on power up, go to folder XXX and play all tracks once...etc Used them to do background music at bus stations, and apart from the occasional card failure or wall wart PSU (typically around 8 yrs of 24/7/365, so I will let them off!), no Id-Al box failures. They also do units which co trigger DMX, so on your card you store your DMX commands, which you trigger from the same cues as the sound. Look at the "event player".
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Matt Stolton - Technical Director (!!!) - Wilding Sound Ltd
"Sparkius metiretur vestra" - "Meter Your Mains" |
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SouthwestCNC
Young Croc Joined: 27 November 2015 Status: Offline Points: 830 |
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How about a laser pen and photo diode for a makeshift laser motion detector.
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Racks&Stacks
Registered User Joined: 10 February 2006 Location: Germany Status: Offline Points: 204 |
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PIR sensors are far cheaper andmore forgiving in terms of setup. I picked up 5 for 8€ on amazon
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SouthwestCNC
Young Croc Joined: 27 November 2015 Status: Offline Points: 830 |
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I wouldn't say so.. Pen £2, diode 10p, 5v adapter carboot £1. Arduino optocoupler £2. Laser is a more accurate trigger for doors. |
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mini-mad
Old Croc Joined: 13 July 2012 Location: london Status: Offline Points: 6903 |
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...bit of duct tape would narrow down the trigger area (?) |
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If it sounds like a gorilla is trying to escape, turn it down.
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SouthwestCNC
Young Croc Joined: 27 November 2015 Status: Offline Points: 830 |
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Could get really basic with it. use lazer/diode with a relay module to switch on an mp3 doorbell lol
Edited by SouthwestCNC - 06 September 2017 at 2:23pm |
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4D
Old Croc Joined: 13 November 2008 Location: Winchester Status: Offline Points: 4257 |
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Gee thanks for the information and offers of help. Most appreciated.. Its like learning a new language I think I must be getting old I am sure back in the seventies when I had my BBC model b all this stuff seemed simple. The Arduino option seems the more affordable. I am not to keen on spending a chunk of the budget on hardware just to do the one show, (my shed is crowded with stuff that has just about paid for itself then rarely goes out again) Anyway thanks for the tips keep em coming Will do more research |
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DMZ. "The bass was intense. Girls were literally running up to stand next to the subs"
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