Pulse-width modulation
38
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18
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Search complete. 38 mentions across 18 episodes found for "Pulse-width modulation".
Sep 7, 2026
Paul CutlerHOST
And here it puts a ton of examples right at your fingertips.
Paul CutlerHOST
From debouncing, there's an example for that, to PWM, to battery voltage monitoring, it's all built in.
Paul CutlerHOST
Like I mentioned, it's a Python app available on Windows, Mac OS, and Linux, but it's not a native app, so you'll need to use the built-in menu bar like I mentioned earlier up here.
Paul CutlerHOST
Everything in the UI has a toggle, so you can hide or show the project explorer, the snippets, and more.
Paul CutlerHOST
And here it puts a ton of examples right at your fingertips.
Paul CutlerHOST
From debouncing, there's an example for that, to PWM, to battery voltage monitoring, it's all built in.
Paul CutlerHOST
Like I mentioned, it's a Python app available on Windows, Mac OS, and Linux, but it's not a native app, so you'll need to use the built-in menu bar, like I mentioned earlier up here.
Paul CutlerHOST
Everything in the UI has a toggle, so you can hide or show the project explorer, the snippets, and more.
G4NJHHOST
The third activity is based on the Raspberry Pi Pico 2 Watt.
G4NJHHOST
It is a demonstration of pulse width modulation and uses just a couple of components including an LED and a resistor which will give you a better understanding of the concept of duty cycle.
G4NJHHOST
All three activities are available via rsgb.org forward slash coding.
G4NJHHOST
You can try them at home, set a practical club night or use them as an activity with a youth or school group.
Herman PoppleberryHOST
In theory, setting green and blue to zero means those channels are off.
Herman PoppleberryHOST
In practice, some drivers leak a small current even at zero, or the PWM signal doesn't go fully to zero, or there's crosstalk between channels.
Herman PoppleberryHOST
And at deep dim
CornHOST
levels, the PWM behavior gets weird.
CornHOST
Some drivers don't dim smoothly down to zero.
CornHOST
They step down to a minimum level and then jump to off.
FabioHOST
It's a whole fun control system.
FabioHOST
So we have a PWM in and, sorry, PWM out and tachometer in.
FabioHOST
So really PWM in and out.
FabioHOST
I can't put a fan to test it, right? Because at a certain point, I need to simulate a stall, for example.
FabioHOST
And with this, you can do it, and the implementation is really clean.
Phil WestwoodHOST
So hopefully you'll have another Bateman after this.
Phil WestwoodHOST
Would that come with PWM?
Tim CotterillGUEST
Yeah, I'd like to think so.
Tim CotterillGUEST
The next step for us would be going to the newer shape cab.
Al WilliamsHOST
I mean, that's old school, right? But there's sure a lot less problems with that.
Al WilliamsHOST
And if you want a PWM control with the relays are probably not your best bet, right? Because they're going to be too slow.
Al WilliamsHOST
But even if you had to do it temporarily just to get some specs, right? Like a scope and a current probe could show you, oh, look, you know, it's, When it stalls, you know, every fourth time it starts, it's on a rolled over bearing or something and it takes 28 amps to start.
Al WilliamsHOST
And normally it takes 12 amps and it's, you know, 100 milliseconds of that before it levels out to 5 amps.
FabioHOST
So it's for... sending and receiving data to a GPIO where the data is encoded into pulses with a different length.
FabioHOST
So imagine like shooting a stream of duty cycle to a PWM.
FabioHOST
That's how I think
BenjaminHOST
about it anyway.
Paulee Alex BowGUEST
I think they sound really, really cool.
Paulee Alex BowGUEST
The PWM sounds brilliant.
Paulee Alex BowGUEST
[laughs] Um-
Rich HiltonGUEST
Yeah, that's interesting
Wim van GoolGUEST
Yeah, real audio output.
Wim van GoolGUEST
And we were looking into, like, maybe we can do it with the PWM and the filtering, and we started looking around, and then we need more pins, and we were already constrained on how many pins we had.
Wim van GoolGUEST
And then we found a relatively cheap I2S chip that did audio conversion, like, okay, let's get one of those, get them on our board, stuff it, and see how well or how-
ChristopheHOST
That's an add-on or that's-
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