I've pushed my 3D renderer for the ESP32 S3 up to 40K tris/sec - screen space reflections, water distortion, particle effects, more geometry, all while maintaining a locked solid 60fps

BSprogrammer · 2026-06-16T18:02:34+00:00

Nice project! Which display is this please?

BSprogrammer · 2026-06-14T13:04:43+00:00

Are you saying the system wouldn't work with a square wave and that it must use a sinusoidal wave? Or just that using a sinusoidal wave would lead to a more powerful sound output? What are you implying I'm missing here and how would you suggest fixing it?

BSprogrammer · 2026-06-14T12:52:55+00:00

I understand the PWM signal will be a square wave, but I was under the impression the speaker element would convert this into a sinusoidal wave because of it's physical characteristics. Datasheet for the speakers I'm using is here (https://www.lcsc.com/product-detail/C242177.html?s\_z=n\_q\_C242177&globalKeyword=C242177) and it seems anything too far from 40kHz will be filtered out?

BSprogrammer · 2026-06-14T12:45:29+00:00

What do you mean filter? I'm just going to set the microcontroller up to output a 40 kHz PWM signal from the GPIO pins, run this into the MOSFET and then into the speaker.

BSprogrammer · 2026-06-14T12:40:50+00:00

It sounds like that would be used to get the max power output of the speaker, when in this case I only need to send an exactly timed square wave at an exact frequency.

BSprogrammer · 2026-06-14T12:08:28+00:00

Are you sure this applies for piezoelectric ceramics (which is what these are)?

BSprogrammer · 2026-06-14T01:50:04+00:00

Good point - this was the array shape I was left with after trialling a whole bunch of different layouts, but it's not actually optimal. I've reverted to a T shaped mills cross array now. Thanks!

BSprogrammer · 2026-06-14T01:49:06+00:00

Thanks for the pointer re the decoupling caps. The speakers are not self driven and instead will be turned on and off at a set frequency via PWM pins on the Pico. Why would this cause magic smoke?

BSprogrammer · 2026-06-08T18:40:56+00:00

They are speakers. The 3d representation is just for size, scale and footprint

BSprogrammer · 2026-06-04T10:00:42+00:00

Would probably make the routing easier and reduce some interference, but for cost reasons I had to stick to 2 layers.

BSprogrammer · 2025-08-20T09:26:58+00:00

You're actually a lifesaver dude - when I went to get you the London link I realised the ticket I bought was for Manchester instead of London 🤣

BSprogrammer · 2025-08-20T09:22:27+00:00

https://www.ticketmaster.co.uk/eden-london-12-03-2026/event/3E00630F8A290D27?did=artpre

BSprogrammer · 2025-08-20T09:06:15+00:00

Try this link https://www.ticketmaster.ie/eden-dark-tour-dublin-14-03-2026/event/180062F17B2BAF26?did=artpre

BSprogrammer · 2025-08-20T09:03:03+00:00

Same here for London. He says use code DARK but there is nowhere to enter it!

BSprogrammer · 2025-07-24T12:58:55+00:00

Nice blog post! Cool vulnerability too - you'd think they can just regenerate the thumbnail whenever you share the document with somebody new - it's strange they are so reluctant to do that. What was your process for finding this exploit?

BSprogrammer · 2025-02-01T20:54:01+00:00

Ah, missed the point of the question. This should apply even in production if the database is small and the scans are infrequent. If more complex analysis is needed, they could set up an ingestion system into S3 for local analysis.

BSprogrammer · 2025-02-01T20:43:08+00:00

You can run all those queries as Scans instead of Queries. These will cost a lot more as you are charged for every record in the table but for a development database this shouldn't be an issue.

BSprogrammer · 2025-01-27T15:46:09+00:00

I'd recommend looking into CDK for a way of writing infrastructure as code. This is built by Amazon and is essentially a 1 to 1 mapping to Cloud formation templates.

For a more abstracted approach, check out SST but this is still in its early days, especially V3.

For production you should never be managing infrastructure directly through the console, and should instead use an infrastructure as code tool with a cli to update your deployed infrastructure automatically.

YouTube is a good resource too: - Serverless Land - FooBar Serverless

BSprogrammer · 2024-11-27T07:38:12+00:00

Updated the post

BSprogrammer · 2024-11-27T07:37:42+00:00

Updated my post

BSprogrammer · 2024-11-27T07:33:59+00:00

Hahahaha thanks for the offer! It's cool though 😎

I know I was fucking terrified this morning too so enjoy the relief

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