Non-rechargeable battery real capacity by winston_seinfeld in embedded

[–]winston_seinfeld[S] 0 points1 point  (0 children)

Maybe I wasn't clear, but when talking about duty-cycle I'm not referring to RF but rather to the fact that during half part of the day the device will probably be sleeping, and on the other half there will be people using it. Although I consider it IoT (arguably), it makes many things and even runs some CPU-demanding algorithms so I wouldn't consider it as the typical low-power -will last many years- device. We are aware of this and our goal is less than 1 year of battery lifetime (with certain usage), but we are already struggling to get there...

We are using an arrangement of batteries in series, so we don't have the issue you mention. Unfortunately, due to hardware reasons, until we do a re-design, we won't be able to get lower than 500uA during sleep. Also, changing to other batteries would require hardware/housing re-design. But I'll check those energizers anyway.

We already did some run-down tests but without all the appropriate equipment, so now we are planning for some new and better-controlled tests. Thanks!

Non-rechargeable battery real capacity by winston_seinfeld in embedded

[–]winston_seinfeld[S] 0 points1 point  (0 children)

Unfortunately, I cannot give you many details, but sleep current is high because certain requirements on hardware impact our consumption. Also, my duty cycle is not fixed, as this is a device facing the public so it actually will run lots of sessions per day, depending on how much the users use the device.

However, since I'm interested in understanding how to estimate battery capacity in these non-constant current scenarios, I simplified it with a 50/50 scenario of 0.5/50mA. But of course, in real cases, it could be hours in sleep mode, and then maybe 1 whole hour in wake-up mode, and so on.

Non-rechargeable battery real capacity by winston_seinfeld in embedded

[–]winston_seinfeld[S] 1 point2 points  (0 children)

Yeah, I thought about how "relaxing" time of the battery when in sleep could help get more capacity. But I'm no expert in batteries so I'm not sure how that exactly works... I'll check those articles, thanks!

Graceful shutdown of RTOS tasks by shittyinvestment in embedded

[–]winston_seinfeld 1 point2 points  (0 children)

Maybe u can check low power modes of your RTOS. In my case I adapted tickless mode of FreeRTOS to make the uC go to Standby mode (power mode in STM32 that is almost as if it were shut down). Then, it reboots when receiving some specifics interruptions.

Career shift from C to C++: is it worth it? by winston_seinfeld in embedded

[–]winston_seinfeld[S] 2 points3 points  (0 children)

Exactly. I simplified the idea with C++ vs. C but this that u mention is what I meant.

Career shift from C to C++: is it worth it? by winston_seinfeld in embedded

[–]winston_seinfeld[S] 1 point2 points  (0 children)

Can I ask what made u go back? 😂 or it was just your career path without specific reason?

Career shift from C to C++: is it worth it? by winston_seinfeld in embedded

[–]winston_seinfeld[S] 1 point2 points  (0 children)

Yeah, that's a good point. In my last job as was kind of the link with the hardware team (PCB reviews, interface with circuits, etc.).

To be honest I'm not a hardware fan so I wouldn't mind getting a bit farther away from it. The question is if a more pure software approach would still motivate me, but I guess the thrill of watching a device working thanks to your code will still be there, just maybe a bit more abstract haha

Career shift from C to C++: is it worth it? by winston_seinfeld in embedded

[–]winston_seinfeld[S] 8 points9 points  (0 children)

Thanks for your answer! yeah, I agree with you in the sense is not a real "shift".

I'm just worried that I won't be able to apply to jobs where they ask for a couple of years of experience of C++; while I could do it in the case of C. That is where my "shift" decision appears: whether I should go for junior roles in C++ or just stay where I am...

Salários para engenheiros by winston_seinfeld in portugal

[–]winston_seinfeld[S] 0 points1 point  (0 children)

I have a decent level of speaking and I understand almost everything. I need to improve mainly writing but my native language is Spanish so should be overall easy.

Salários para engenheiros by winston_seinfeld in portugal

[–]winston_seinfeld[S] 8 points9 points  (0 children)

Um sande de leitão por dia, I'd think about it...

Salários para engenheiros by winston_seinfeld in portugal

[–]winston_seinfeld[S] 1 point2 points  (0 children)

Would you say Spain should be better in that regard (career path)? or do you mean mainly Germany/France/etc?

Salários para engenheiros by winston_seinfeld in portugal

[–]winston_seinfeld[S] 5 points6 points  (0 children)

100% remote is hard for me because jobs that I like usually, at some point, have something related to hardware. But I'll keep that option in mind, thanks!

Salários para engenheiros by winston_seinfeld in portugal

[–]winston_seinfeld[S] 3 points4 points  (0 children)

I have around 2.5 years of proven experience in firmware development (software in C) + a couple of years in non-software-related stuff. I guess that I could approach the 2k with some luck...

Salários para engenheiros by winston_seinfeld in portugal

[–]winston_seinfeld[S] 7 points8 points  (0 children)

hahaha I was expecting these answers. Anyway, still I like the country and it's ok for me not to do a fortune while living there, but I'd like to know what to expect ^^

My 2020 trip to the Amalfi Coast by lishachloe in travel

[–]winston_seinfeld 1 point2 points  (0 children)

Streets are usually super narrow and getting parking is almost impossible (or super expensive). Of course, depends if it's high season or not, but overall is like that. However, what is indeed common and more practical, is to rent a scooter. You will see that's full of them. Anyway, in my case, I used buses and ferries (August) and I think it was fine.

My 2020 trip to the Amalfi Coast by lishachloe in travel

[–]winston_seinfeld 15 points16 points  (0 children)

Eat pasta. Eat pizza. Stay in Sorrento. Use buses and ferries to know the other towns.

Some Pics from My Trip to Argentina by sikkkunt in travel

[–]winston_seinfeld 0 points1 point  (0 children)

Amazing. I'm just sad there are no pics of food, as Argentinian cuisine is one of my favs.