#thru — Public Fediverse posts
Live and recent posts from across the Fediverse tagged #thru, aggregated by home.social.
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Some of the bothies along the Cape Wrath Trail in Scotland we visited on our #thru-hike of the #CWT. https://youtu.be/ibwOoLkMZ98 Edited and color graded in #davinciresolve #filmmaking.
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Se lancer sur l'#Hexatrek avec son chien ?
Oui c'est possible, grâce à Florian et Thrall qui se sont lancés dans l'aventure en 2022.
Depuis, la trace a été aménagée par l'Hexateam.
À télécharger avec le rapport complet de Florian ici : https://www.hexatrek.com/randonner-avec-son-chien#randonnee #trek #thru-hike
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I have a need to route MIDI to several Raspberry Pi boards at the same time, so I’ve hacked together a variant of my MIDI Matrix Patch Bay to give me a 3.3V level serial MIDI THRU interface.
I’ve used it for my 8-way Raspberry Pi V1 MiniDexed in the following video.
Warning! I strongly recommend using old or second hand equipment for your experiments. I am not responsible for any damage to expensive instruments!
These are the key tutorials for the main concepts used in this project:
If you are new to microcontrollers and electronics, see the Getting Started pages.
Parts list
- MIDI Matrix Patch Bay INPUT board PCB
For the MIDI circuit:
- 1x H11L1 optoisolators.
- 2x 74HC14 (HC or HCT variants).
- 1x 1N914 or 1N4148 signal diodes.
- 1x 220Ω resistors.
- 1x 1K resistors.
- 3x 100nF ceramic capacitors.
- 1x 3.5mm, stereo TRS sockets, PCB mounted (see photos for footprint).
- Optional: 1x 180, 5-pin DIN sockets, PCB mounted (see photos for footprint).
- Optional: pin headers.
- Optional 1x 6-pin DIP sockets.
- Optional 2x 14-pin DIP sockets.
- Pin headers.
For the 3V3 power circuit:
- TL1117 3.3V regulator (the fixed kind, not the configurable kind).
- 1x 100nF ceramic capacitor.
- 1x 10uF electrolytic.
- 1x 100uF electrolytic.
- Barrel jack socket.
The Circuit
The INPUT board for my MIDI patch bay gives two MIDI INPUT channels, each broken out to 10 MIDI THRU channels. In my case I just want a single channel so will be using half of the INPUT board and the power supply section.
But as I want to provide a direct serial link to a Raspberry Pi, I need two things:
- I don’t need a full MIDI OUT stage, so will be taking the IO level directly from the 74HC14 inverters.
- I need it to work with 3V3 logic voltage levels.
The latter can be solved by using a 3V3 regulator to power the whole circuit and running the inverters and optoisolator at 3V. But the power supply was designed for a LM7805 regulator with a TO-220 footprint and whilst it is possible to get a 3V regulator in TO-220 the pinouts are different!
As this is a one-off, I’ve opted to reuse one of my spare PCBs regardless and used the following, completely hacky solution… It works for me, but I’m not sure I could recommend it to anyone else 🙂
I started populating the lower half of the PCB (I only need one MIDI circuit), but then decided it was actually a lot easier to have used the upper half! So I ended up populating that too for convenience and then ignoring the lower half.
Build notes:
- As mentioned, the LM1117 is offset to align the pins with the LM7805 footprint.
- I’ve just used wire links in place of the 220Ω resistors that would have been used on the MIDI THRU outputs if I was using a full MIDI OUT stage.
- I’ve added header pins in the range of (optional) GND connections linked to the PSU part of the PCB.
- I used both TRS and DIN MIDI sockets, although I’m only at this stage planning on using the DIN MIDI for now.
- The last photo shows both MIDI channels populated, but as already mentioned I’m only a actually using the top one. The lower half has no chips installed.
- The whole thing can be powered using a centre-positive barrel jack connector. In the last photo I’m using a USB A to barrel jack lead, so am powering it from 5V.
Closing Thoughts
This is not really meant to be a serious proposition, but it was something I needed and I had some spare PCBs that were very close, so I just made do to solve my specific problem.
And it worked for me.
But of course, this is very definitely a “only use with your expensive Raspberry Pi or musical instruments if you know what you are doing” project.
Kevin
https://diyelectromusic.wordpress.com/2023/10/28/3-3v-serial-midi-thru/
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From @QCODEmedia @spoke_media #THRU - join Cody as he has a lot to be grateful for as well as look forward to, plus an Announcement regarding what’s on the horizon with future episodes. Looking forward to hearing them 💜
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From @QCODEmedia @spoke_media #THRU : bed head, facial hair, dandruff, kids! Why are Cody and friends discussing these things? Catch up now with all the latest campfire shenanigans and discover 💜
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From @QCODEmedia @spoke_media #THRU - Cody’s feelings surface, raw, emotional but hopefully cathartic for him. Catch up with the latest from his journey 💜
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From @QCODEmedia @spoke_media #THRU : sorry, not sorry! Why did Cody’s day become nail biting, exhilarating and anxious listening? Listen away to find out💜
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From @CODEmedia @spoke_media #THRU - join Cody as his day is one of special rocks, perfect backdrops and appreciation of the moments. Sounds like this was a good one💜
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From @QCODEmedia @spoke_media #THRU. A new day, a new chapter and some bad news. How’s Cody doing? Time to catch up with his latest recordings 💜
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From @QCODEmedia @spoke_media #THRU : Trail Log. Brain games on the PCT Trail with Cody and friends, provides relief and laughter. Join him now in this latest update💜
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From @QCODEmedia @spoke_media #THRU. Has Cody recovered from those Oysters and a Trail name is bestowed? Join him now, as the adventure continues💜
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From @QCODEmedia @spoke_media #THRU, join Cody in what proves not to be a great time for him and discover the cause of his gurgles! Sorry Cody, it’s not great having this happen💜
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Trail brain and a spot of rapping are part of Cody’s world but how’s he doing overall? Time to catch up with him in @[email protected] @[email protected] #Thru now. Love catching up with his latest recordings💜 https://podcasts.apple.com/gb/podcast/thru/id1673461830?i=1000610152971
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From @[email protected] @[email protected] a Bonus episode #Thru: From The Daily Grind: Thomas Gathman Believes He Can Do It. Take this opportunity to check this show out and subscribe for more stories💜 https://podcasts.apple.com/gb/podcast/thru/id1673461830?i=1000608744394
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From @[email protected] @[email protected] #Thru enjoy the entire song: Breakmaster Cylinder “Burgers and Fries” #Cody will be happy!🤗💜 https://podcasts.apple.com/gb/podcast/thru/id1673461830?i=1000608320168
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From @[email protected] @[email protected] #Thru, join #Cody as he crosses the start line and the long journey ahead begins. Does the dreaded chaffing strike and will eyes on the prize help him navigate this first full day? #GoCody💜 https://podcasts.apple.com/gb/podcast/thru/id1673461830?i=1000606802539
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Time to catch up with Cody as he interviews people in his life before he begins his epic walk in @[email protected] #THRU. This is so joyous to listen to, from an engaging young man. Thoroughly enjoying following his journey💜 https://podcasts.apple.com/gb/podcast/thru/id1673461830?i=1000603666190
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Melanie Vogel "walked across Canada from east to north to west...20,000 km." on the Trans Canada Trail. Globe & Mail's Dec 31 cover story is a fitting way to end 2022 - reflecting Canada's geographic diversity & the kindness of many. She touched all 3 oceans setting out solo until she befriended Malo, a Labrador-Husky dog.
https://www.theglobeandmail.com/canada/article-walking-trans-canada-trail/
#MelanieVogel #dog #TransCanadaTrail #Canada #hiking #thru-hike #longwalks #LongWalking #backpacking #travel #outdoors #oceans #TheGlobeAndMail