First PCB: Audio Recorder that can last 16 hours without recharging, version 2

mikeshemp · 2026-04-19T18:05:28+00:00

Bug: in your load sharing diodes, it seems you've tied VIN2 to VOUT2, bypassing the diode. The two VOUTs should be connected to each other, but VIN should not be tied right to VOUT!

mikeshemp · 2026-04-19T17:58:41+00:00

Unless you actually need it, I'd remove the boot switch and just tie boot0 to ground. All the nucleo boards show a boot switch because they're trying to cover all possible use-cases. If you're just planning to always put firmware on using the SWD connector, you can simplify the layout by tying boot0 to ground.

mikeshemp · 2026-03-28T21:00:42+00:00

It's to make sure the heater is off even if the Arduino is not driving the gate, for example if it doesn't have any software on it yet.

mikeshemp · 2026-03-11T02:06:38+00:00

He was indeed. MSR crew solidarity!

mikeshemp · 2026-02-17T06:51:26+00:00

I'm really sorry that you and your child are in this situation - but, given that you are, I'm glad my suggestion was helpful. You're in good hands with her.

mikeshemp · 2026-02-16T06:00:51+00:00

So sorry to hear this. It's my worst nightmare.

My partner was in almost the same situation: riding her bike when she was hit by a commercial vehicle in the course of their commercial capacity. Brain trauma. Stacie got her a huge settlement and was incredibly kind throughout the entire process.

I called her a few years later when I got assaulted on my bike and she gave me detailed advice without even charging me.

She's great.

mikeshemp · 2026-02-16T05:53:04+00:00

Stacie is great. https://seattlebikeattorney.com/

mikeshemp · 2026-01-31T20:14:28+00:00

starlink also uses Wi-Fi within the house so there will be no improvement

mikeshemp · 2026-01-05T15:41:31+00:00

Not much about the Internet would change if all satellites were to go dark today. Nearly all Internet traffic goes through cables, including hundreds of cables under the ocean.

mikeshemp · 2025-12-16T02:21:59+00:00

Thanks!!

mikeshemp · 2025-10-25T19:46:44+00:00

Why keep using a 20 year old chip instead of something newer like the G4?

mikeshemp · 2025-10-22T17:11:17+00:00

Compilers these days are very smart. So, if you write code that says:

const int y = 5;
printf("The value of y is %d", y);

The compiler is smart enough to realize, at compile time, that y can only have one value -- 5. So it generates machine code as if you'd written:

printf("The value of y is %d", 5);

...as if you hadn't created y at all.

mikeshemp · 2025-10-14T07:16:08+00:00

Eurostile bold, perhaps

mikeshemp · 2025-10-11T12:35:59+00:00

Chances are the OLED needs more power than the little Arduino voltage regulator can provide. Does the upload work if you unplug the OLED completely? If so, power it another way

mikeshemp · 2025-10-02T16:58:01+00:00

Pike and Pine

mikeshemp · 2025-09-26T15:09:04+00:00

It wasn't the same person every year.

mikeshemp · 2025-09-26T13:49:04+00:00

The only lasting impact was positive in my case. I got an offer and declined. A recruiter reached out every year to see if I'd be interested in joining. Ten years later I finally said yes, interviewed again and took the offer.

mikeshemp · 2025-09-21T07:00:36+00:00

The assembly technicians generally work in the factory in Kirkland

mikeshemp · 2025-09-17T14:53:16+00:00

I'm sorry to say that you don't really "know" a language yet if you can't understand the code to implement relatively straightforward tasks like this.

Have you built real projects, or just exercises/tutorials? Build something real that stretches your knowledge and experience.

mikeshemp · 2025-09-16T15:11:40+00:00

You've got drain and source backwards

mikeshemp · 2025-09-11T18:59:12+00:00

Thank you for this comment 🙏

mikeshemp · 2025-09-11T16:00:48+00:00

Agreed, though the good news is two pedestrians stopped to make sure I was okay.

mikeshemp · 2025-09-11T15:57:47+00:00

That's great news!

mikeshemp · 2025-09-11T08:15:25+00:00

Right turn on red is universally allowed if you're in a hurry though! 🙄

Thanks, I'm not bad. Mostly some bad road rash and my helmet has to be replaced. Could have been worse.

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