With a PMOS device used for simple on/off switching, placing the load between drain and ground would be correct. With an NMOS FET, the load should be between drain and VCC.

In general: NMOS source to GND, PMOS source to VCC.

Props for the detailled answer, but this all sounds completely backwards.

Low-side switching should in general use an N-Channel FET. And with your voltage divider, the gate will be at 9% of the supply voltage, not 91%, which means the FET will always be conducting. It will also never fully turn on, because that would mean the Gate-Source voltage would drop to near 0, which would turn it off again - it will instead settle somewhere near the GS threshold voltage from Drain (and Gate) to Source. Moreover, PMOS devices are not controlled by the Gate-Drain voltage, but with the Gate-Source voltage, just like NMOS devices.

My counter proposal:

Edit: Note that this is an N-Channel FET

Edit 2: Changed image, I initially placed the resistor and the tripwire the wrong way around.

I noticed that I glossed over your breadboard requirement. If you want to use something like an ATtiny or CH32, you could always buy some generic SMD breakouts like this. Both of these microcontroller series have internal oscillators and flash memories, so you really don’t need any external components. Maybe a bypass capacitor for good measure.

If networking is the goal, choose any ESP32 module. If you want something simple akin to an ATtiny, ich can recommend the CH32V003. Is has plenty pins and an I²C peripheral, costs around 15 ct. For accurate timing, add an external oscillator instead of using the internal one.

Edit: You could also use an external real time clock like the PCF8563, then you’d have an absolute datetime and wouldn’t need accurate timing on the microcontroller itself. The buy the CH32 (and anything else), I would choose lcsc.com

Maybe I should have included another object for scale. It was advertized as a grapefruit of variety “Sweety”. According the Wikipedia it’s also known as an “Oroblanco”, and the color is typical. In any case it tasted alright for a foreign fruit in winter for 79 cents :D I liked that the flesh was very easy to scoop out.

discuss.tchncs.de is tech-focused :) It seems like there are no communities for games and comics yet though.

I also daily use Firefox, Thunderbird, VSCodium, Signal, KeepassXC, DAVx5 and Radicale for calendar syncronization.

What I don’t use each and every day but what are among my favorite FOSS projects are KiCad for electronics design and CoMaps for navigation.

Linux, or as I’ve recently taken to calling it, Linux.

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I’m not sure about the standard - but in my experience, if a PD trigger IC requests 12V, that will be supplied, no matter the current draw. I have used this to power several low power devices, for example a 12V computer fan, and I have also verified this with no load at all. There is also PD PPS, which could be used to deliver 14V or any other voltage.

Edit: I normally use this kind of trigger board, they are available everywhere online.

I noticed that you use digitalWrite multiple times for each transmitted pixel. That function is pretty slow - you should instead manipulate the microcontrollers registers directly for maximum performance. If you are using an Arduino, this article will help: https://roboticsbackend.com/arduino-fast-digitalwrite/

Das ist mir tatsächlich vor Kurzem so passiert - drei Betrunkene mit fetter Musikbox, direkt neben mich und voll aufgedreht, dann auch noch das Bier umgeschüttet und beim Losfahren das rollende Bier- und Musikboxtransportgerät im Gang an die Trägheit verloren.

In German it’s called Arschbackenoberschenkelabtrennfalte

Yes, higher density means you exhaust more mass during those 2s, and therefore you don’t have to pee so fast.

Aerospace engineer here. To levitate, the force of the exhausted mass flow (F=ṁ×v) has to equal the pull of gravity (F=m×g) on your body. The gravity of earth is g=9.81N/kg. Wikipedia says the average body mass is 62kg. It also says the bladder capacity of an adult is about 400ml, and I’ll assume the density to be 1kg/l. You want to levitate for 2 seconds, so your mass flow needs to be ṁ=0.4kg/2s=0.2kg/s. If you rearrange the equation, you get v=m×g/ṁ=62kg×9.81N/kg/(0.2kg/s)=3041m/s.

So if you manage to pee with a velocity of about 3km/s, you can levitate for 2 seconds with an average sized bladder.

To achive that, your “exhaust” must be clenched to a diameter of about 0.29mm. This gives a cross-section of 0.066mm² or 6.6×10^-8m². Multiply that with the velocity of 3041m/s and you again get your flow of 0.2l/s.

Of course, during those 2 seconds you loose mass and therefore, earth’s pull on you gets less and you start to accelerate to about 0.23km/h, reaching a height of 4cm. If you took your special bladder to space, we can use the rocket equation to calculate that this stunt would accelerate you to 3041m/s×ln(62kg/61.6kg)=19.7m/s=71km/h

The Long Dark? Offline single player survival in the postapocalyptic Canadian wildernis. There is a survival mode in which you can freely explore, but also a story mode and several challenges. In my opinion an extremely beautiful game and on the higher difficulties also extremly challenging.

I can’t say anything in regard to modern printers, but I don’t trust any proprietary device connected to the internet. I have an old inkjet and an old laser printer, both without network functionality themselves - but I connected them via USB to a Raspberry Pi, which runs a printer server and makes them available on the local network. I can print and scan from my Linux laptop, and I also managed to print something from my Android phone. Haven’t tried Windows yet. Configuration of the Raspberry Pi was easy, especially enabling scanning via the network.