I've had vague plans for a while to build a relay based sound distribution thing for the space. Looking back at orders for some of the parts shows I started collecting bits to do this in June...
I think I've firmed up the plans enough now that I might be ready to actually do it so thought I'd let you all knwo what the plan is and see if there is consensus that this is something we want in the space. I also have plans for a similar setup at home so the parts can go there if the space doesn't want it. I'm thinking to make 2 4x4 crossbar switches (one for each stereo channel) to connect any of the 4 inputs to 4 outputs. Plus a pi of some description driving shift registers to control the relays and have a web interface of some description to let people pick which input should be connected to where. Or might put a nodemcu in for the feeding the shift registers and have the web side running on alford (that would make more sense if it is also (going to be) running interface to control the lights). I know there are "better" ways to switch audio signals but I like the clicky noises relays make so want to do it this way. I'm actually very tempted to have extra switching the relays on and off whenever it changes things just to have more clicky noises. 4 inputs I'm thinking: pimpd, chromecast audio, bluetooth and 3.5mm jack. I have a bluetooth board for that input, and the others are there already. For the outputs I have 4 amp boards whose listing has vanished from Amazon but are very similar to this one (same amp chip and look similar, except the PCB is red): https://www.amazon.co.uk/KKmoon-TDA7498-Channel-Digital-Amplifier/dp/B019Z7BGVK/ref=sr_1_fkmr0_1?ie=UTF8&qid=1539449578&sr=8-1-fkmr0 One of them is currently driving the speakers in the main room. I have a spare pair of speakers that can be donated for this, and possibly antoher pair that I could steal from their current use. That still leaves 1 pair short though: if anyone has any bookshelf style speakers (or car speakers)they could donate that would be great. Otherwise I can see what can be found on eBay. I'm thinking two pairs of speakers in the main room; one pair at the end they currently are and a pair in the corners by the roof at the other end of the room. One pair somewhere in the workshop and one pair in the snug. I don't have any plans for adding anything upstairs to this (mostly because I can't be bothered running cables between, but it could be extended to have more outputs (or move one of the ones from downstairs) if folks think that would be better. Parts I (or the space) already have: - relay boards (2* 16 relay boards for switches and 1 * 8 channel for mutes on the amp boards) - 4 * amp boards - Bluetooth input board - pimpd - chromecast audio - 24V 15A power supply (Not actually enough to max all 4 amps but probably plenty loud enough). - Pi and/or nodemcu - shift registers - 2 (or 3) pairs of bookshelf speakers. I think more/better speakers are the only parts I'm still looking for. So, thoughts? Objections? Anyone want to help (greatly increases the chances of it getting done in the near future if anyone else wants to get involved)? Robert ________________________________________________________ Robert McWilliam r...@allmail.net argh.technology The purpose of life is to fight maturity. -- Dick Wirthimer _______________________________________________ 57north-discuss mailing list 57north-discuss@lists.57north.co http://lists.57north.co/listinfo/57north-discuss
