Activity for Olin Lathropâ€
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A: Tools required to burn code in a quad flat microcontroller The days of socketed microcontrollers are long gone. In most cases, the socket would cost more than the micro. Nowadays, microcontrollers, whether in quad flat pack packages or not, are surface mount soldered onto boards along with all the other parts. There are then two ways to get the program ... (more) |
— | over 4 years ago |
| Comment | Post #276217 |
@Bruce: I don't know what to tell you. The URL is the one Codidact produced when I uploaded the image. I can see the image in both the Edge and IE browsers. If you are using a modern supported browser, then maybe you should report this as a bug on main meta. (more) |
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| Edit | Post #276217 |
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| Comment | Post #276235 |
@mana: I'm going to wait a day or two to give others a chance to chime in. If nobody does, we'll go with the above. (more) |
— | over 4 years ago |
| Comment | Post #276225 |
At these voltages, you really should consider a Schottky diode. Half the forward drop would make a difference here, and they are fast too. The higher reverse leakage is not much of an issue in this application. However, +1 anyway :-) (more) |
— | over 4 years ago |
| Comment | Post #276235 |
@mana: I hadn't thought of that alternate interpretation. I would like to mention the electronic part first, since that is the overwhelming majority of the questions. I could go with "... electronic systems, electric power systems, their theory …". Would that be acceptable? (more) |
— | over 4 years ago |
| Edit | Post #276235 | Initial revision | — | over 4 years ago |
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A: Tagline/Mission Statement/etc. The short phrase is trying to capture the two broad classes of topics here: Electronic things, like opamps, transistors, microcontrollers, 20 W power supplies, and the like. Utility-scale power systems, like multi-MW generators, large over-land transmission lines, local distribution systems of ... (more) |
— | over 4 years ago |
| Edit | Post #276137 |
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| Edit | Post #276217 |
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| Edit | Post #276217 | Initial revision | — | over 4 years ago |
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A: Moving average that uses less memory? You can't eliminate all noise, use no memory, no processing cycles, and not add some lag. However, you can do much better than a brute force "moving average" filter. FIR versus IIR filters There are two broad classes of digital filters, FIR (finite impulse response), and IIR (inifinite impu... (more) |
— | over 4 years ago |
| Edit | Post #276216 | Initial revision | — | over 4 years ago |
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Moving average that uses less memory? My control system gets a signal representing the plant output, but that signal has a lot of noise on it. The control system goes nuts trying to react to the noise. I need to filter out the noise somehow, but preserve the basic plant response. I heard about a moving average and tried it. It hel... (more) |
— | over 4 years ago |
| Comment | Post #276160 |
@manass: Markdown is simpler, but that simplicity comes at the cost of ambiguity and too many unintended markups. I also don't want to have to remember two syntaxes. Use markup if you like, but please make sure all the same formatting features continue to be available via some subset of HTML. Actu... (more) |
— | over 4 years ago |
| Comment | Post #276166 |
@Andy: I was only saying that the issues you bring up are not unique to this EE site. They apply to the Codidact software in general. I didn't pass any judgement about what is a bug, what's not, and what is a feature. I was also trying to make it clear that this software is work in progress. Work... (more) |
— | over 4 years ago |
| Comment | Post #276166 |
Most of these are system-wide issues, not specific to this EE site. There is a system-wide meta for that, but the people that would see that might also notice it here. The software is very much still in development, but far enough along to have at least basically working Q&A sites. I was really as... (more) |
— | over 4 years ago |
| Comment | Post #276146 |
@Lundin: Some of what you ask for already existed. I also just added a few items. Repair questions are tricky to make on-topic. There should probably be a help page devoted to them, like there is for component ID questions. I'll work on that as I have time. (more) |
— | over 4 years ago |
| Edit | Post #275880 | Post edited | — | over 4 years ago |
| Edit | Post #275889 | Post edited | — | over 4 years ago |
| Edit | Post #275889 | Post edited | — | over 4 years ago |
| Comment | Post #276146 |
@Monica: Thanks, but I think we'll wait a bit on that. Creating lots of categories early makes the site look even more empty than with the single category we have now. We may eventually get there. Time will also help us see where splits make the most sense. Frankly, I think it was a mistake of Ph... (more) |
— | over 4 years ago |
| Edit | Post #276160 | Initial revision | — | over 4 years ago |
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A: Viewing the potential live output when editing a question or answer. I recommend using native HTML for lists, and most other formatting for that matter. HTML gets around the ambiguity of what is an item and what is text following the list. The list isn't over until the </ol> tag. For more information about formatting, see the Formatting Posts document in th... (more) |
— | over 4 years ago |
| Edit | Post #276138 |
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| Edit | Post #276142 | Initial revision | — | over 4 years ago |
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A: Driving LED with NPN transistor from I/O pin First, let's redraw the circuit a little more clearly, with logical flow left to right. This also protects the answer from possible changes to the question. Image alt text As you say, Q1 is a switch to control the LED. Most likely, a separate transistor was used to keep the LED current out of... (more) |
— | over 4 years ago |
| Edit | Post #276137 | Initial revision | — | over 4 years ago |
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A: How to calculate pullup resistor value for pushbutton? To understand this issue, we have to look at how your circuit works and what the pullup does within it. You have a pushbutton you want to read with a microcontroller. The pushbutton is a momentary SPST (Single Pole Single Throw) switch. It has two connection points which are either connected ... (more) |
— | over 4 years ago |
| Edit | Post #276136 | Initial revision | — | over 4 years ago |
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How to calculate pullup resistor value for pushbutton? What value pullup resistor should I use for a pushbutton connected to a microcontroller input? Image alt text I've seen values from 1 kΩ to over 100 kΩ. Some references just say to use 10 kΩ because it's a "good value". How do I calculate this to decide for myself? (more) |
— | over 4 years ago |
| Edit | Post #276117 |
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— | over 4 years ago |
| Edit | Post #276117 | Initial revision | — | over 4 years ago |
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A: Driving relay, transistor keeps failing The reason the transistor is dying is because you didn't put a flyback diode across the relay coil. Relay coils have significant inductance. This means the current can't change instantly without the voltage being infinite. It takes voltage applied over time to change the current thru an ind... (more) |
— | over 4 years ago |
| Edit | Post #276116 | Initial revision | — | over 4 years ago |
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Driving relay, transistor keeps failing I'm trying to drive a relay according to a 5 V digital signal, using this circuit: Image alt text It works for a while, but then the transistor fails. When I replace the transistor, it works for a while again, then fails again. The transistor is rated for 600 mA and 40 V. I'm only running 63... (more) |
— | over 4 years ago |
| Comment | Post #276106 |
@aCVn: Good point about AC versus DC. I added a section for that. (more) |
— | over 4 years ago |
| Edit | Post #276106 |
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| Edit | Post #275960 |
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| Edit | Post #275955 | Post edited | — | over 4 years ago |
| Edit | Post #276106 | Initial revision | — | over 4 years ago |
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A: Replacement power supply voltage and current ratings? Voltage Rating If a device says it needs a particular voltage, then you have to assume it needs that voltage. Both lower and higher could be bad. When no tolerance or input voltage range is specified, ±5% should be close enough. ±10% will probably be OK most of the time. I wo... (more) |
— | over 4 years ago |
| Edit | Post #276105 | Initial revision | — | over 4 years ago |
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Replacement power supply voltage and current ratings? If the external power supply to a device fails, and I can't get the exact model, what do I need to specify to get the right replacement? I can re-use the old supply's connector, but what about the voltage and current ratings? How close do they need to be to what it says on the device? What i... (more) |
— | over 4 years ago |
| Comment | Post #275960 |
@Monica: Yes, I plan on adding a few canonical questions. I've been busy with the help pages, and the day job gets in the way too. Do you think this is something we need to do before getting the word out about the site? (more) |
— | over 4 years ago |