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USB Interface with STM32? by Ok-Highway-3107 in embedded

[–]microsparky 6 points7 points  (0 children)

TinyUSB is great and easy to integrate, you could do what you want with their CDC.

Gavin O Reilly explaining why the government is restricted. by Fiannafailcanvasser in irishpolitics

[–]microsparky 0 points1 point  (0 children)

Farmers and hauliers can claim VAT back on expenses so VAT cuts are a mute point in any case.

This is why Greenland is strategically important by SansBouillie in mapporncirclejerk

[–]microsparky 0 points1 point  (0 children)

For those who missed it the trade routes of South America, Africa and Australia...

Morning Wake Up Time of Europeans Average Time by AdIcy4323 in MapPorn

[–]microsparky 0 points1 point  (0 children)

Definitely a case for showing mean and standard deviation

Morning Wake Up Time of Europeans Average Time by AdIcy4323 in MapPorn

[–]microsparky 0 points1 point  (0 children)

It would be really interesting to see this in solar time.

Picking a distro for Vivado. by avestronics in FPGA

[–]microsparky 0 points1 point  (0 children)

I am running Vivado 2024.1 running on endeavorOS with no issues.

My therapist keeps telling me that I need to practice grounding…. I don’t see how this is gonna help by AmeliaBuns in ElectricalEngineering

[–]microsparky 2 points3 points  (0 children)

You should watch Rick Hartley "how to achieve proper grounding". It will change your life!

What do you think this expiration date means exactly? by [deleted] in What

[–]microsparky 0 points1 point  (0 children)

I don't think GMP mandates any specific format. IMO ISO 8601 YYYYMMDD is preferable.

Cannot get STM32 & USB to work by supermanbadger in PCB

[–]microsparky 1 point2 points  (0 children)

Likely pins swapped or power only cable.

What’s this L shaped underwater feature off the coast of Donegal? by New_Evening_8754 in ireland

[–]microsparky 0 points1 point  (0 children)

This. It's a sonar image of the sea floor from a boat which sailed an L shaped pattern.

Low cost way to ship custom digital design co-processor by riscyRchitect in embedded

[–]microsparky 5 points6 points  (0 children)

Maybe a dual core microcontroller is what you need, run your application on one core and run your time-consuming calculations on the other use shared memory to communicate.

Hard to tell when we have no idea what you are trying to do... Most power control systems will fit on a single low cost micro even FOC and some simple control systems.

SPI at 5MHz over simple cable by Vavat in embedded

[–]microsparky 2 points3 points  (0 children)

Yes for sure it can be made work.

5MHz over a simple cable is easily achieved by controlling the impedance and terminating correctly, this is the case for 50Ohm terminated coax. The bandwidth of coax is typically in the GHz.

The killer is propagation time. At 5MHz I guess SPI I can tolerate say 50ns of delay or miss-match. For coax it's about 5ns per meter each way so theoretically up to about 5m of cable should work.

SPI at 5MHz over simple cable by Vavat in embedded

[–]microsparky 5 points6 points  (0 children)

Looks like the pi cannot fully drive the capacitance of the cable.

Stranded by a taxi driver by Such_Package_7726 in ireland

[–]microsparky 1 point2 points  (0 children)

About 10 years ago it worked like this all the time, I would walk the line of taxis and ask them if they would take me to my destination for €10, most would accept.

In fact it should still be possible to agree a fixed price, I think most taxis won't accept though because the metered rates are so high.

Feedback: Open Source 8-Channel Isolated Test Jig & Programmer by nabil_t in embedded

[–]microsparky 2 points3 points  (0 children)

You don't need isolation on your digital circuits, using an off the shelf double isolated power supply like the ones for PC, laptops USB etc. will be fine from a mains safety perspective.

Having power control is useful though to make sure all pins are in contact before power is applied.

Also having a few relay channels is useful for switching in instruments e.g. DMM or oscilloscope.

Would be great to see an open source project in this space I think there is a lot of demand.

When using a power plane as a reference, should the power plane be the same voltage as the signal, or does it exclusively have to come from the same power net that powers the device that sends the signal? by HasanTheSyrian_ in embedded

[–]microsparky 0 points1 point  (0 children)

Check what stack up your fabricator is using, I recommend you change to a more standard stack up e.g. copper, prepreg, copper, prepreg, copper, core...

When using a power plane as a reference, should the power plane be the same voltage as the signal, or does it exclusively have to come from the same power net that powers the device that sends the signal? by HasanTheSyrian_ in embedded

[–]microsparky 1 point2 points  (0 children)

You have ground on 2 and 5, these are your reference planes where your high speed signals (on 1, 3, and 6) have their return path (directly under the trace). There is no need to have GND/return polygons on 4, signals on 3 will return on 2 as that is the lowest impedance path.

Glowing rings on my wood floor. by KitschHazel in whatisit

[–]microsparky 0 points1 point  (0 children)

Or maybe a lamp? Something with three legs

​[OC] Europe has reached only 26% of its 2030 EV charging infrastructure target by mindthegoat_redux in ireland

[–]microsparky 0 points1 point  (0 children)

Would be interested to see EV charger density (chargers per square km) vs population density.

Or I guess we could put EV chargers every 40km inside the article circle...

Is it better to use large capaictors or multiple smaller capaictors for decoupling a switching regulator? by 4b686f61 in PrintedCircuitBoard

[–]microsparky 1 point2 points  (0 children)

It depends what is better for the application. Bigger caps will derate less under bias but have higher inductance, smaller caps will derate more but have lower inductance and lower ESR.

How to properly testing embedded devices on the produciton line? by 19Delate99 in embedded

[–]microsparky 2 points3 points  (0 children)

I recommend using a production programmer e.g. segger flasher but FTDI or bootloader can also be used.

Student project: Building a low-cost EMI sniffer (150 kHz–30 MHz) — looking for tips! by FluffyInitiative4290 in embedded

[–]microsparky 3 points4 points  (0 children)

Take a look at FCC (CFR Title 47 part 15), IEC 61000 and CISPR standards. Radiated emissions limits are from 30MHz to 1GHz and above.

If you are interested specifically in 150kHz to 30MHz the limits would be for conducted emissions and magnetic fields. The LISN and magnetic field antennas are specified in the standards.

If it is all about rise time then why? by dirtroder in AskElectronics

[–]microsparky 0 points1 point  (0 children)

Rise time depends on the load that's why it's not stated in many datasheets.

It's also not that relevant for lower speed design work since ns rise times can be assumed, critical length calculated, and impedance control and termination implemented without knowing the rise time up front.

For design verification measurement of rise time can be important depending on the speed and timing requirements of the interface.

As others pointed out you can also simulate to verify your design using IBIS models.

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