General > General Technical Chat
Software guys, please, no.
tggzzz:
--- Quote from: pcprogrammer on September 18, 2022, 05:11:05 am ---
--- Quote from: Ed.Kloonk on September 18, 2022, 04:39:12 am ---
--- Quote from: WattsThat on September 18, 2022, 04:36:53 am ---Beware software weenies wielding screwdrivers or even worse, a soldering iron.
--- End quote ---
Do hobbyists use soldering irons anymore? Everything is breadboard and ribbon cables isn't it?
--- End quote ---
If you want to make something that actually works you need a soldering iron. How often have I had something on a shitty breadboard not work properly :palm:
--- End quote ---
Positive: solderless breadboards give you opportunity to hone your debugging skills.
Negative: skills at debugging solderless breadboards, not your circuits.
Solderless breadboards: just say no. Use the selection of these techniques that matches your requirements https://entertaininghacks.wordpress.com/2020/07/22/prototyping-circuits-easy-cheap-fast-reliable-techniques/
magic:
--- Quote from: rfclown on September 18, 2022, 02:46:48 am ---I haven't done through the details to see if it's ok to do what he did... but it might be ok. The GPIOs on a PI have a programmable drive strength from 2mA to 16mA. Basically you get to vary the number and size of the inverters driving the pin (which dictates Idss). The default "strength" is 8mA. Consider also that the LED voltage is 2V or so.
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Please stop muddying the water with those confusing acronyms.
YouTube told me that a MOSFET is a switch which is either ON or OFF; this cannot possibly work :box:
AndyBeez:
One can shave half a cent by removing a series resistor in a 3V3 GPIO line, but I have never seen this done in the wild. Not even on the RPi. To drive (and dim) a naked LED requires 50% PWM maximum.
--- Quote from: Ed.Kloonk on September 18, 2022, 04:39:12 am ---Do hobbyists use soldering irons anymore? Everything is breadboard and ribbon cables isn't it?
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Hobbyists today not only have software to suffer, but dreaded SMDs. Soldering hell 101. PTH parts and breadboards go together, but at some point in the future, PTH parts will go out of production, and breadboards will only work in software. Hoard LEDs now.
--- Quote from: Nominal Animal on September 18, 2022, 02:18:52 am ---...You know, the person who copy-pastes code off the web, until something compiles and passes through the minimal test. In the open source world, the person who responds to bug reports with "it works on my machine, so I'm closing this bug report as invalid".
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Which is why I gave up on open source development. Often some dumb Reddit bros with a Linux shell for social skills. Everyone can do the blinky example, on every embedded device thanks to VS Code and Platform.IO, but can they write a library with embedded assembler patches? This requires reading and understanding datasheets. Wot do the thinking :-//
pcprogrammer:
--- Quote from: tggzzz on September 18, 2022, 08:09:11 am ---Solderless breadboards: just say no. Use the selection of these techniques that matches your requirements https://entertaininghacks.wordpress.com/2020/07/22/prototyping-circuits-easy-cheap-fast-reliable-techniques/
--- End quote ---
The only good use I have for the solderless ones is with modules like a blue pill or arduino nano and dupont style wires that make reasonable connections, but as soon as you start connecting other components like resistors or capacitors that are a bit older or have thin wires it gets wonky. And when you want to scope a signal on such a component it always flips out the hole. |O
mikeselectricstuff:
For a demo like this I think it's perfectly reasonable to omit the resistor for simplicity. Nothing will burn or catch fire. The LED and GPIO pin will limit the current enough.
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