Simple Open Source Photobioreactor
[Bhuvanmakes] says that he has the simplest open source photobioreactor. Is it? Since it is the only photobioreactor we are aware of, we’ll assume that it is. According to the post, other designs are either difficult to recreate since they require PC boards, sensors, and significant coding.
This project uses no microcontroller, so it has no coding. It also has no sensors. The device is essentially an acrylic tube with an air pump and some LEDs.
The base is 3D printed and contains very limited electronics. In addition to the normal construction, apparently, the cylinder has to be very clean before you introduce the bioreactant.
Of course, you also need something to bioreact, if that’s even a real word. The biomass of choice in this case was Scenedesmus algae. While photobioreactors are used in commercial settings where you need to grow something that requires light, like algae, this one appears to mostly be for decorative purposes. Sort of an aquarium for algae. Then again, maybe someone has some use for this. If that’s you, let us know what your plans are in the comments.
We’ve seen a lantern repurposed into a bioreactor. It doesn’t really have the photo part, but we’ve seen a homebrew bioreactor for making penicillin.
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COTS Components Combine to DIY Solar Power Station
They’re marketed as “Solar Generators” or “Solar Power Stations” but what they are is a nice box with a battery, charge controller, and inverter inside. [DoItYourselfDad] on Youtube decided that since all of those parts are available separately, he could put one together himself.
The project is a nice simple job for a weekend afternoon. (He claims 2 hours.) Because it’s all COTS components, it just a matter of wiring everything together, and sticking into a box. [DoItYourselfDad] walks his viewers through this process very clearly, including installing a shunt to monitor the battery. (This is the kind of video you could send to your brother-in-law in good conscience.)
Strictly speaking, he didn’t need the shunt, since his fancy LiFePo pack from TimeUSB has one built in with Bluetooth connectivity. Having a dedicated screen is nice, though, as is the ability to charge from wall power or solar, via the two different charge controllers [DoItYourselfDad] includes. If it were our power station, we’d be sure to put in a DC-DC converter for USB-PD functionality, but his use case must be different as he has a 120 V inverter as the only output. That’s the nice thing about doing it yourself, though: you can include all the features you want, and none that you don’t.
We’re not totally sure about his claim that the clear cargo box was chosen because he was inspired by late-90s Macintosh computers, but it’s a perfectly usable case, and the build quality is probably as good as the cheapest options on TEMU.
This project is simple, but it does the job. Have you made a more sophisticated battery box, or other more-impressive project? Don’t cast shade on [DoItYourselfDad]: cast light on your work by letting us know about it!.
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Israele attacca l’Iran. Esplosioni a Teheran
@Notizie dall'Italia e dal mondo
La nuova guerra scatenata da Netanyahu segue le rivelazioni sull'imminenza dell'attacco fatte ieri da due televisioni americane
L'articolo Israele attacca l’Iran. Esplosioni a Teheran proviene da Pagine Esteri.
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✍ Tutte le novità della #Maturità2025 spiegate dalla Dott.ssa Flaminia Giorda, Coordinatrice Nazionale del Servizio Ispettivo e della Struttura Tecnica degli Esami di Stato.
Qui il video➡️ youtu.be/af_bqCfx9nc
Ministero dell'Istruzione
✍ Tutte le novità della #Maturità2025 spiegate dalla Dott.ssa Flaminia Giorda, Coordinatrice Nazionale del Servizio Ispettivo e della Struttura Tecnica degli Esami di Stato. Qui il video➡️ https://youtu.be/af_bqCfx9nc #MIMaturoTelegram
The Billionth Repository On GitHub is Really Shitty
What’s the GitHub repository you have created that you think is of most note? Which one do you think of as your magnum opus, the one that you will be remembered by? Was it the CAD files and schematics of a device for ending world hunger, or perhaps it was software designed to end poverty? Spare a thought for [AasishPokhrel] then, for his latest repository is one that he’ll be remembered by for all the wrong reasons. The poor guy created a repository with a scatalogical name, no doubt to store random things, but had the misfortune to inadvertently create the billionth repository on GitHub.
At the time of writing, the repository sadly contains no commits. But he seems to have won an unexpectedly valuable piece of Internet real estate judging by the attention it’s received, and if we were him we’d be scrambling to fill it with whatever wisdom we wanted the world to see. A peek at his other repos suggests he’s busy learning JavaScript, and we wish him luck in that endeavor.
We think everyone will at some time or another have let loose some code into the wild perhaps with a comment they later regret, or a silly name that later comes back to haunt them. We know we have. So enjoy a giggle at his expense, but don’t give him a hard time. After all, this much entertainment should be rewarded.
End of an Era: NOAA’s Polar Sats Wind Down Operations
Since October 1978, the National Oceanic and Atmospheric Administration (NOAA) has operated its fleet of Polar-orbiting Operational Environmental Satellites (POES) — the data from which has been used for a wide array of environmental monitoring applications, from weather forecasting to the detection of forest fires and volcanic eruptions. But technology marches on, and considering that even the youngest member of the fleet has been in orbit for 16 years, NOAA has decided to retire the remaining operational POES satellites on June 16th.NOAA Polar-orbiting Operational Environmental Satellite (POES)
Under normal circumstances, the retirement of weather satellites wouldn’t have a great impact on our community. But in this case, the satellites in question utilize the Automatic Picture Transmission (APT), Low-Rate Picture Transmission (LRPT), and High Resolution Picture Transmission (HRPT) protocols, all of which can be received by affordable software defined radios (SDRs) such as the RTL-SDR and easily decoded using free and open source software.
As such, many a radio hobbyist has pointed their DIY antennas at these particular satellites and pulled down stunning pictures of the Earth. It’s the kind of thing that’s impressive enough to get new folks interested in experimenting with radio, and losing it would be a big blow to the hobby.
Luckily, it’s not all bad news. While one of the NOAA satellites slated for retirement is already down for good, at least two remaining birds should be broadcasting publicly accessible imagery for the foreseeable future.
Not For Operational Use
The story starts in January, when NOAA announced that it would soon stop actively maintaining the three remaining operational POES satellites: NOAA-15, NOAA-18, and NOAA-19. At the time, the agency said there were currently no plans to decommission the spacecraft, and that anything they transmitted back down to Earth should be considered “data of opportunity” rather than a reliable source of information.
However, things appeared to have changed by April when NOAA sent out an update with what seemed like conflicting information. The update said that delivery of all data from the satellites would be terminated on June 16th, and that any users should switch over to other sources. Taken at face value, this certainly sounded like the end of amateurs being able to receive images from these particular satellites.
This was enough of a concern for radio hobbyists that Carl Reinemann, who operates the SDR-focused website USRadioguy.com, reached out to NOAA’s Office of Satellite and Product Operations for clarification. It was explained that the intent of the notice was to inform the public that NOAA would no longer be using or disseminating any of the data collected by the POES satellites, not that they would stop transmitting data entirely.
Further, the APT, LRPT, and HRPT services were to remain active and operate as before. The only difference now would be that the agency couldn’t guarantee how long the data would be available. Should there be any errors or failures on the spacecraft, NOAA won’t address them. In official government parlance, from June 16th, the feeds from the satellites would be considered unsuitable for “operational use.”
In other words, NOAA-15, NOAA-18, and NOAA-19 are free to beam Earth images down to anyone who cares to listen, but when they stop working, they will very likely stop working for good.
NOAA-18’s Early Retirement
As it turns out, it wouldn’t take long before this new arrangement was put to the test. At the end of May, NOAA-15’s S-band radio suffered some sort of failure, causing its output power to drop from its normal 7 watts down to approximately 0.8 watts. This significantly degraded both the downlinked images and the telemetry coming from the spacecraft. This didn’t just make reception by hobbyists more difficult. Even NOAA’s ground stations were having trouble sifting through the noise to get any useful data. To make matters even worse, the failing radio was also the only one left onboard the spacecraft that could actually receive commands from the ground.
While the transmission power issue seemed intermittent, there was clearly something very wrong with the radio, and there was no backup unit to switch over to. Concerned that they might lose control of the satellite entirely, ground controllers quickly made the decision to decommission NOAA-18 on June 6th.
Due to their limited propulsion systems, the POES satellites are unable to de-orbit themselves. So the decommissioning process instead tries to render the spacecraft as inert as possible. This includes turning off all transmitters, venting any remaining propellant into space, and finally, disconnecting all of the batteries from their chargers so they will eventually go flat.
At first glance, this might seem like a rash decision. After all, it was just a glitchy transmitter. What does it matter if NOAA wasn’t planning on using any more data from the satellite in a week or two anyway? But the decision makes more sense when you consider the fate of earlier NOAA POES satellites.
Curse of the Big Four
When one satellite breaks up in orbit, it’s an anomaly. When a second one goes to pieces, it’s time to start looking for commonality between the events. But when four similar spacecraft all explode in the same way…it’s clear you’ve got a serious problem.
That’s precisely what happened with NOAA-16, NOAA-17, and two of their counterparts from the Defense Meteorological Satellite Program (DMSP), DMSP F11, and DMSP F13, between 2015 and 2021. While it’s nearly impossible to come to a definitive conclusion about what happened to the vehicles, collectively referred to as the “Big Four” in the NOAA-17 Break-up Engineering Investigation’s 2023 report, the most likely cause is a violent rupture of the craft’s Ni-Cd battery pack due to extreme overcharging.
What’s interesting is that NOAA-16 and 17, as well as DMSP F11, had gone through the decommissioning process before their respective breakups. As mentioned earlier, the final phase of the deactivation process is the disconnection of all batteries from the charging system. The NOAA-17 investigation was unable to fully explain how the batteries on these spacecraft could have become overcharged in this state, but speculated it may be possible that some fault in the electrical system inadvertently allowed the batteries to be charged through what normally would have been a discharge path.
As such, there’s no guarantee that the now decommissioned NOAA-18 is actually safe from a design flaw that destroyed its two immediate predecessors. But considering the risk of not disconnecting the charge circuits on a spacecraft design that’s known to be prone to overcharging its batteries, it’s not hard to see why NOAA went ahead with the shutdown process while they still had the chance.
The Future of Satellite Sniffing
GOES-16 Image, Credit: USRadioguy.com
While there are no immediate plans to decommission NOAA-15 and 19, it’s clear that the writing is on the wall. Especially considering the issues NOAA-15 has had in the past. These birds aren’t getting any younger, and eventually they’ll go dark, especially now that they’re no longer being actively managed.
So does that mean the end of DIY satellite imagery? Thankfully, no. While it’s true that NOAA-15 and 19 are the only two satellites still transmitting the analog APT protocol, the digital LRPT and HRPT protocols are currently in use by the latest Russian weather satellites. Meteor-M 2-3 was launched in June 2023, and Meteor-M 2-4 went up in February 2024, so both should be around for quite some time. In addition, at least four more satellites in the Meteor-M family are slated for launch by 2042.
So, between Russia’s Meteor fleet and the NOAA GOES satellites in geosynchronous orbit, hobbyists should still have plenty to point their antennas at in the coming years.
Want to grab your own images? There are tutorials. You can even learn how to listen to the Russian birds.
2025 Pet Hacks Contest: Cat at the Door
This Pet Hacks Contest entry from [Andrea] opens the door to a great collaboration of sensors to solve a problem. The Cat At The Door project’s name is a bit of a giveaway to its purpose, but this project has something for everyone, from radar to e-ink, LoRa to 3D printing. He wanted a sensor to watch the door his cats frequent and when one of his cats were detected have an alert sent to where he is in the house
There are several ways you can detect a cat, in this project [Andrea] went with mmWave radar, and this is ideal for sensing a cat as it allows the sensor to sit protected inside, it works day or night, and it doesn’t stop working should the cat stand still. In his project log he has a chapter going into what he did to dial in the settings on the LD2410C radar board.
How do you know if you’re detecting your cat, some other cat, a large squirrel, or a small child? It helps if you first give your cats a MAC address, in the form of a BLE tag. Once the radar detects presence of a suspected cat, the ESP32-S3 starts looking over Bluetooth, and if a known tag is found it will identify which cat or cats are outside waiting.
Once the known cat has been identified, it’s time to notify [Andrea] that his cat is waiting for his door opening abilities. To do this he selected an ESP32 board that includes a SX1262 LoRa module for communicating with the portable notification device. This battery powered device has a low power e-paper display showing you which cat, as well as an audio buzzer to help alert you.
To read more details about this project head over to the GitHub page to check out all the details. Including a very impressive 80 page step-by-step guide showing you step by step how to make your own. Also, be sure to check out the other entries into the 2025 Pet Hacks Contest.
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La maternità frena l'occupazione femminile - Info Data
Solo il 62,3% delle donne con figli minori è occupata, una percentuale che sale al 68,9% per quante non hanno figliRiccardo Saporiti (Info Data)
ilfattoquotidiano.it/2025/06/1…
Rutte-Meloni, industria e difesa gettano le basi della Nato di domani
@Notizie dall'Italia e dal mondo
La Nato è unita, deve rafforzarsi anche con l’aiuto del suo pilastro atlantico, di cui l’Italia è parte strategica. Mark Rutte non ha, nel suo incontro a Palazzo Chigi con Giorgia Meloni, solo messo l’accento sulle priorità strutturali dell’alleanza atlantica ma in “un’era
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L'Italia non è il paese più caro dove caricare un'auto elettrica
Un portale irlandese ha confrontato le tariffe per la ricarica casalinga in Europa, stabilendo dove sono più costose e più economiche.Andrea Spitti (alvolante.it)
Ben(e)detto sul Referendum
@Politica interna, europea e internazionale
L'articolo Ben(e)detto sul Referendum proviene da Fondazione Luigi Einaudi.
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L’asse Roma-Aia decide la sicurezza euroatlantica
@Notizie dall'Italia e dal mondo
A meno di un mese dal vertice Nato dell’Aia, la capitale è tornata a ospitare un confronto ad alta densità strategica. La presidente del Consiglio Giorgia Meloni ha ricevuto a Palazzo Chigi il segretario generale dell’Alleanza Atlantica, Mark Rutte, in una tappa significativa del suo primo giro europeo dopo la
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noticilla gorilla sapiens
gorillasapiens.wordpress.com/2…
#giorgiomanganelli @gorillasapiens
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È uscito il nuovo numero di The Post Internazionale. Da oggi potete acquistare la copia digitale
@Politica interna, europea e internazionale
È uscito il nuovo numero di The Post Internazionale. Il magazine, disponibile già da ora nella versione digitale sulla nostra App, e da domani, venerdì 13 giugno, in tutte le edicole, propone ogni due settimane inchieste e approfondimenti sugli affari e il potere in
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Una giungla di fenomeni.
Se non riesci a concentrarti su cose serie per più di mezz'ora, è tempo di un post cazzaro.
Può anche non riuscire.
Tanto, sul #Blog, chi ti scova?
Cultura della Difesa e spesa militare sostenibile. Crosetto e Giorgetti a confronto
@Notizie dall'Italia e dal mondo
Autorità dello Stato, rappresentanti delle istituzioni e militari, Pmi e colossi della Difesa si sono riuniti nel IV Forum sulla Difesa organizzato del Centro Studi Machiavelli, presso l’università Link di Roma, per discutere sulle priorità strategiche e sulle necessità stringenti per la
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Censura globale: dai palchi europei alle sale di Hollywood
@Notizie dall'Italia e dal mondo
Lo scenario di libertà cambia e impone nuove regole alla cultura pop internazionale. Quest’anno l’Eurovision ha vietato qualsiasi tema politico o di attualità. Tutti gli artisti in gara hanno dovuto firmare un documento ufficiale in cui si sono impegnati a rispettare una serie di comportamenti,
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Israele-Germania. Più stretta la collaborazione militare, Berlino acquista l’Arrow 3
@Notizie dall'Italia e dal mondo
Entro la fine del 2025 Berlino riceverà il sistema di “difesa aerea” israeliano di ultima generazione. Costo: 3,5 miliardi di dollari
L'articolo Israele-Germania. Più stretta la collaborazione militare, Berlino acquista l’Arrow 3 proviene
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freezonemagazine.com/articoli/…
Con questo articolo Free Zone Magazine continua la serie di interviste a Editori Indipendenti perché riteniamo che il loro ruolo nel campo dell’editoria sia da sempre di vitale importanza. Ciò per il lavoro di accurata ricerca, da loro svolto, nell’individuazione di autori e libri di particolare interesse, oltre che valore letterario, che altrimenti
Le commissioni in Parlamento cambiano stagione, ma poche poltrone | Pagella Politica
pagellapolitica.it/articoli/ri…
Dal 3 giugno è aperta la piattaforma per le adesioni individuali alla Campagna Stop ReArm Europe.
MANIFESTAZIONE NAZIONALE CONTRO GUERRA, RIARMO, GENOCIDIO, AUTORITARISMO
FERMIAMO LA GUERRA - STOP REARM EUROPE
ROMA 21 GIUGNO 2025 ore 14:00 Porta Sa…
FREE ASSANGE Italia
Dal 3 giugno è aperta la piattaforma per le adesioni individuali alla Campagna Stop ReArm Europe. MANIFESTAZIONE NAZIONALE CONTRO GUERRA, RIARMO, GENOCIDIO, AUTORITARISMO FERMIAMO LA GUERRA - STOP REARM EUROPE ROMA 21 GIUGNO 2025 ore 14:00 Porta Sa…Telegram
Anche la Toscana interromperà le relazioni istituzionali con Israele
"L’interruzione delle relazioni istituzionali ha un valore più politico che economico. Di fatto significa che i rappresentanti delle regioni, a partire dai presidenti, non potranno incontrare diplomatici israeliani e che non potranno essere organizzati eventi in collaborazione con istituzioni israeliane".
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The confirmation follows 404 Media's reporting using flight data and air traffic control (ATC) audio that showed the agency was flying Predator drones above Los Angeles.
The confirmation follows 404 Mediax27;s reporting using flight data and air traffic control (ATC) audio that showed the agency was flying Predator drones above Los Angeles.#News
CBP Confirms It Is Flying Predator Drones Above Los Angeles To Support ICE
The confirmation follows 404 Media's reporting using flight data and air traffic control (ATC) audio that showed the agency was flying Predator drones above Los Angeles.Joseph Cox (404 Media)
USA e #Cina, il teatro dei #dazi
USA e Cina, il teatro dei dazi
Al termine di due giorni di discussioni a Londra, le delegazioni di alto livello di Cina e Stati Uniti avrebbero trovato un accordo sul ripristino del meccanismo di “consenso”, sottoscritto a Ginevra lo scorso mese di maggio, per evitare un’escalatio…www.altrenotizie.org
non sono soltanto le #bugiesioniste a darmi il voltastomaco, ma anche la facilità del mondo #Google ad accettare clienti di questa risma: youtu.be/Cs7cpkDKTh0?si=jA96In…
ma ci rendiamo conto del livello di schifo?
#vomito #sionisti
#Gaza #genocidio #Palestina
#warcrimes #sionismo #zionism
#starvingpeople #starvingcivilians
#iof #idf #colonialism #sionisti
#izrahell #israelterroriststate
#invasion #israelcriminalstate
#israelestatocriminale
#bambini #massacri #deportazione
#concentramento
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Grecia, tre deputati neofascisti sospesi per “frode elettorale”
@Notizie dall'Italia e dal mondo
In Grecia la Corte Suprema ha inabilitato tre deputati del partito di estrema destra "Spartani", guidato dal carcere dall'ex leader di Alba Dorata
L'articolo Grecia, tre deputati neofascisti sospesi per “frode elettorale” proviene da pagineesteri.it/2025/06/11/mon…
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“This would do immediate and irreversible harm to our readers and to our reputation as a decently trustworthy and serious source,” one Wikipedia editor said.#News
All’Italia serve una strategia per abbassare le bollette (di A. Corrado)
@Politica interna, europea e internazionale
Mentre sembra sempre che il governo Meloni abbia cose più importanti da fare, in Italia si aggira indisturbato un Robin Hood impazzito che svuota le tasche a cittadine e cittadini e alle piccole e medie imprese, spina dorsale del nostro tessuto economico e produttivo, per gonfiare quelle dei ricchi, che
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Come proteggersi durante le proteste. I dimostranti affrontano gas lacrimogeni, granate stordenti, coronavirus e sorveglianza
Come evitare che le cosiddette armi non letali provochino danni temporanei o permanenti? Come proteggere la propria identità dagli strumenti di identificazione biometrica?
Nota dell'editore (11/06/25): Ripubblichiamo questo articolo del 2020 alla luce delle recenti proteste contro i raid sull'immigrazione a Los Angeles.
Grazie a @Mike Taylor 🦕 che ha condiviso l'articolo
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Cosa cambia con la legge sulla space economy. Il confronto con Mascaretti e Valente su Formiche.net
@Notizie dall'Italia e dal mondo
Con l’approvazione definitiva del Disegno di legge in materia di economia dello Spazio, l’Italia compie un passo strategico verso la definizione di una vera politica industriale del settore spaziale. Una legge attesa, che
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Filippo
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in reply to simona • •