Photo Diode Puns

Hello, I am new to NFC communication and I'm working on a project in which for the initial stage, I am required to interface a photodiode with a NFC chip and then read that data (current/voltage generated by the diode) on my NFC enabled phone which will be interfaced with the chip wirelessly. I looked up a few chips with wired interface and since most of them use SPI/I2C, I wonder if I need an A/D converter prior to interfacing the photodiode with the chip. Any help in this regard would be appreciated 🙏

For one of my final assignments, the objective was to create an amplifier circuit which does not significantly decrease the SNR of the sensor. However, it is also required to calculate the sensor's SNR itself. For sensors which function as voltage sources with a series resistance (and maybe capacitance) on a bandwidth of a few kHz or MHz, the formula for thermal noise is quite clear to calculate.

However, my setup is a photodiode with only a parallel capacitance which operates around DC (which makes the whole bandwidth integral kind of useless. I've tried to calculate the SNR by figuring out the specral noise density around burst noise and 1/f noise, but this ended up giving me an SNR of around 150 dB, which doesn't seem realistic. Am I missing some easier/straight forward way to calculate this, or now? Would love to hear

-Electrical engineering student from NL

Hi,

I'm looking for a way to measure light intensity and sample it at around 50 Khz. I'm not very knowledgeable about the hardware to do this, so I'm looking for suggestions. I'm imagining something that simply outputs a reasonable voltage that could be picked up by, say, an audio card on a PC.

How would you go about doing this/what would you use?

Cheers.

http://www.amazon.com/445nm-Diode-Copper-Module-Element/dp/B00HFHJBDI/ref=sr_1_fkmr1_3?ie=UTF8&qid=1416649531&sr=8-3-fkmr1&keywords=AixiZ+2w

Don't these things come with an LDR, or photo-diode or something of that nature - hence 3 pins?

There's only 2 wires...?

Anybody know how to get a photodiode to turn lights on when it gets dark? Its setup backwards by default which is by far the dumbest thing in the game.

Edit: After a little research I found you have to add a "Not" logic to your circuit for it to turn lights on at night.

Vous voulez un écran pour Noël ? Ce guide remplace l'ancien guide moniteurs de 2019 en deux parties, car j'ai constaté que beaucoup lisaient le guide d'achat mais pas forcément les explications techniques de la partie 1. J'ai laissé les anciens sujets (partie 1 et 2) pour que vous puissiez bénéficier des commentaires de l'époque.

Les autres guides d'achat

Les guides sur Github

dernière maj dec. 2021

Taille et définition

Déjà on va commencer par une petite erreur de français :

• La définition, c'est le nombre de pixels affichés à l'écran (appelée couremment à tort résolution). Ex : 1920x1080 pixels.

• La résolution, c'est la définition divisée par la taille de l'écran. Ex : 1920x1080 à 24" (92 pixels par inch ou ppi)

Parlons d'abord de définitions. Tout ça c'est standardisé évidemment, voici les plus communes :

Évidemment pour les joueurs, plus la définition est élevée, plus la carte graphique doit travailler. L'incrément n'est pas linéaire grâce à différentes optimisations, mais faire tourner un jeu en QHD ou en 4K sera nettement plus lourd qu'en FHD (mais sans solliciter plus le CPU).

> Trigger warning sur la définition 2K : ça ne veut rien dire, arrêtez de dire 2K pour dire QHD, c'est une définition pour le mastering cinéma proche du FHD. Même les vendeurs s'y mettent maintenant, donc je me sens obligé de dire que ça signifie souvent QHD, mais c'est une erreur.

Résolution (=définition/taille)

Ce qui est important donc, c'est la résolution, le rapport entre la taille de l'écran et sa définition (en ppi, pixel par inch). De mon ex

UPDATE (January 16): The GB closed. Thank you all for your participation and support! I will send invoices within 72 hours.

Hello everyone!

After many hours of routing, I present to you my PCB — kt60-M!

This is a small group buy, because while I try my hand.

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Prototype photos and final version renders.

After prototyping, I made a few changes to the PCB: changed diodes and made the routing even better. All these changes are on the renders.

Main feature: cutouts under stabilizers. With them sound at bottomout is a little quieter than without them.

Specifications:

• Universal 60% PCB. Fits in most 60% cases
• Type-C connector
• JST connector for daughterboard (optional). Supports ai03's Unified Daughterboard
• QMK and VIA support
• ESD, overvoltage and overcurrent protection
• Уellow mask (please pay attention to it)
• Thickness: 1.6mm

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GB info:

• Price: $40 + shipping (about $13-17)
• MOQ: 10
• GB will continue until MOQ is reached
• Estimated shipping date: 7-8 weeks after GB end date

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If you are interested in my PCB, fill out this form:

GB FORM

And if you have any questions, I'll be happy to answer them!

Thank you for reading!

I don't want to step on anybody's toes here, but the amount of non-dad jokes here in this subreddit really annoys me. First of all, dad jokes CAN be NSFW, it clearly says so in the sub rules. Secondly, it doesn't automatically make it a dad joke if it's from a conversation between you and your child. Most importantly, the jokes that your CHILDREN tell YOU are not dad jokes. The point of a dad joke is that it's so cheesy only a dad who's trying to be funny would make such a joke. That's it. They are stupid plays on words, lame puns and so on. There has to be a clever pun or wordplay for it to be considered a dad joke.

Again, to all the fellow dads, I apologise if I'm sounding too harsh. But I just needed to get it off my chest.

Here are a few thoughts about what we see in the recent video.

Abel Good to see the CEO and founder giving us the tour himself. Looks inspired and confident.

Controlsat module right there on the floor it is the heart of the Bluewalker 3 and the Bluebird satellites, and we see the CEO himself, showing how the Payload adaptor embraces the complete satellite, when there are packed microns on it.

**Controlsat module.**How do I know that is a controlsat module? For one it has the proper size and shape, and it s full of spots for solar panels. But have a close look at the assymetrical pattern of black squares on it.

Note: It is the same controlsat module for BBs and BW3, so that there is a module on the floor does not tell us the state of assembly.

Rendering of a Bluebird, we see the solar panel side. Note the pattern of White Squares on controlsat module.

Time made?

Most of it appears shot at around nov 30th 2021. u/Peeloosy pulled that timestamp from a screen in the video, and there was this group photo taken and on Twitter dec 3d 2021 featuring Jason Silva and Abel in the clothes they wear in video. At least one shot is of later date, and that is the assembled device to finally fold the satellite.

We know this device was assembled later in December.

This shot is taken later than most of video. it is from december.

img

Q/V band earth station tracking antenna with gimbal

This is new. It collapses like an umbrella and packs inside the gimbal, then the gimbal likely pops inside the controlsat module for stovage. 3-4 of these links per satellite might correspond to 3-4 or 6-8 such antennas per satellite. Abel just said "several". Like every bit about this image, except the cable routing as moving cables risk touch the gimbal. But then again finding such weak spots is what this test procedure is all about.

These small mesh dish antennas is the Space section main element of what Bluewalker 3 is primarily testing. The Q/V backhaul link. (The fronthaul is alread

Do your worst!

I'm surprised it hasn't decade.