4 ms·

The article doesn't explain what happens when it "sings", though. The title made me imagine the engine revving such that you'd hear different notes but... this

The article doesn't explain what happens when it "sings", though. The title made me imagine the engine revving such that you'd hear different notes but... this is not a normal mower, it's a smart mower with a mobile app; computer with a blade. It could probably play MP3s for all I know. What does this actually do?

cromulent 2y ago
Yeah I am guessing it is from the motor RPM pitch but I would like to find out. The Renault F1 engine could famously play tunes this way. https://youtu.be/XRXwWbo_mX0?t=60 https://youtu.be/XRXwWbo_mX0?t=60
RobotToaster 2y ago
A brushless motor can also act as a speaker when driven correctly, but I'm assuming it's just manipulating the motor RPM.
- 83 2y ago
  Drones emit all sorts of beeps and tones using the brushless motors but I'm not entirely certain by what mechanism the motor controllers accomplish it. The motors aren't spinning when they emit a tone but they do twitch/move so I assume its some sort of back and forth vibration.
orangepenguin 2y ago
This video from Husqvarna 2 years ago doesn't sound like it's a motor noise. Sounds more like an onboard beeper that can emit single tones. This, in my opinion, is rather disappointing. https://www.youtube.com/watch?v=p0_RPlSe344 https://www.youtube.com/watch?v=p0_RPlSe344 It's possible that's some kind of motor noise, but it doesn't sound like it to me. EDIT: I realize when I say "motor noise" there's some ambiguity. I know there isn't a gas powered engine in this little mower. Revving an engine is exactly what I expected, and this isn't that. When I reference motor noise here, I just mean sound could be produced by a servo or similar, but I don't think that's what's happening.
hunter2_ 2y ago
It beeps. The transducer is efficient at monophonic simple waveforms but it would choke on a complex waveform as commonly encoded via MP3. Presumably the beeper was used only for critical UX until this most recent update which includes a programmed sequence of beeps that play this tune.
mitchbob 2y ago
I was hoping for something like musical chainsaws. https://youtu.be/AwZuN6JEP6I?si=dY3YioNMdTkx7Vci https://youtu.be/AwZuN6JEP6I?si=dY3YioNMdTkx7Vci

cromulent 2y ago

Yeah I am guessing it is from the motor RPM pitch but I would like to find out. The Renault F1 engine could famously play tunes this way. https://youtu.be/XRXwWbo_mX0?t=60 https://youtu.be/XRXwWbo_mX0?t=60

RobotToaster 2y ago

A brushless motor can also act as a speaker when driven correctly, but I'm assuming it's just manipulating the motor RPM.

83 2y ago
Drones emit all sorts of beeps and tones using the brushless motors but I'm not entirely certain by what mechanism the motor controllers accomplish it. The motors aren't spinning when they emit a tone but they do twitch/move so I assume its some sort of back and forth vibration.

orangepenguin 2y ago

This video from Husqvarna 2 years ago doesn't sound like it's a motor noise. Sounds more like an onboard beeper that can emit single tones. This, in my opinion, is rather disappointing. https://www.youtube.com/watch?v=p0_RPlSe344 https://www.youtube.com/watch?v=p0_RPlSe344 It's possible that's some kind of motor noise, but it doesn't sound like it to me. EDIT: I realize when I say "motor noise" there's some ambiguity. I know there isn't a gas powered engine in this little mower. Revving an engine is exactly what I expected, and this isn't that. When I reference motor noise here, I just mean sound could be produced by a servo or similar, but I don't think that's what's happening.

hunter2_ 2y ago

It beeps. The transducer is efficient at monophonic simple waveforms but it would choke on a complex waveform as commonly encoded via MP3. Presumably the beeper was used only for critical UX until this most recent update which includes a programmed sequence of beeps that play this tune.

mitchbob 2y ago

I was hoping for something like musical chainsaws. https://youtu.be/AwZuN6JEP6I?si=dY3YioNMdTkx7Vci https://youtu.be/AwZuN6JEP6I?si=dY3YioNMdTkx7Vci