The Plum-O-Meter: Weighing Plums Using 3D Touch in Swift • Hacker News Board

Re: The Plum-O-Meter: Weighing Plums Using 3D Touch in Swift

#21

Post by roflchoppa » Sat, Oct 24, 2015, 9:03 PM UTC

spython wrote: post #5

How about apples? Can you weigh apples?

I had a similar idea for weighing pot, at least you dont need a scale.....

Re: The Plum-O-Meter: Weighing Plums Using 3D Touch in Swift

#22

Post by bhassel » Sat, Oct 24, 2015, 9:20 PM UTC

GPGPU wrote: post #12

It would be great if I can step on my iPhone every morning, and MyFitnessPal would record my weight.

If you stood on something acting as a lever that reduced the weight on your phone, you could probably make it work...

Re: The Plum-O-Meter: Weighing Plums Using 3D Touch in Swift

#23

Post by thrownaway2424 » Sat, Oct 24, 2015, 10:29 PM UTC

weaksauce wrote: post #17

thrownaway2424 wrote: post #9

Earlier quoted context omitted.

A US nickel coin weighs exactly 5g. Edit: if you happen to be in that exotic locale. I'm sure other coinage has similarly consistent weight.

A dollar bill weighs 1g.

That's cool. I assume that holds for any American bill, since they're all the same size?

Re: The Plum-O-Meter: Weighing Plums Using 3D Touch in Swift

#24

Post by weaksauce » Sat, Oct 24, 2015, 11:27 PM UTC

thrownaway2424 wrote: post #23

weaksauce wrote: post #17

Earlier quoted context omitted.

A dollar bill weighs 1g.

That's cool. I assume that holds for any American bill, since they're all the same size?

indeed it does. I have done it with 10 bills of mixed denominations and it's 10 grams on a scale.

Re: The Plum-O-Meter: Weighing Plums Using 3D Touch in Swift

#25

Post by vitalus » Sun, Oct 25, 2015, 12:09 AM UTC

What kind of granularity can you get with this? Based on all of the apps/build in features utilizing 3D Touch, I had thought it was binary.

Re: The Plum-O-Meter: Weighing Plums Using 3D Touch in Swift

#26

Post by eclipxe » Sun, Oct 25, 2015, 1:11 AM UTC

vitalus wrote: post #25

What kind of granularity can you get with this? Based on all of the apps/build in features utilizing 3D Touch, I had thought it was binary.

Really? Lightly touch an icon but don't press hard enough to show the shortcut menu - as you modulate your touch pressure the glow will follow. When you peek an email, adjust the pressure of your touch - you will see it zoom in and out.

Within a few minutes of playing with the feature it was obvious that it was very high resolution detection of pressures.

Re: The Plum-O-Meter: Weighing Plums Using 3D Touch in Swift

#27

Post by porsupah » Sun, Oct 25, 2015, 3:39 AM UTC

vitalus wrote: post #25

What kind of granularity can you get with this? Based on all of the apps/build in features utilizing 3D Touch, I had thought it was binary.

Somewhere around 336 levels, it would seem, with this generation.

https://medium.com/@rknla/exploring-apple-s-3d-touch-f5980ef...

Re: The Plum-O-Meter: Weighing Plums Using 3D Touch in Swift

#28

Post by [deleted] » Sun, Oct 25, 2015, 3:46 AM UTC

GPGPU wrote: post #19

jschwartzi wrote: post #18

Earlier quoted context omitted.

I think this is the use case for a Bluetooth scale

Yeah, but I'm not going to take a Bluetooth scale when I go on business trips.

[deleted]

Re: The Plum-O-Meter: Weighing Plums Using 3D Touch in Swift

#29

Post by toxicFork » Sun, Oct 25, 2015, 10:51 AM UTC

bentpins wrote: post #15

toxicFork wrote: post #14

Earlier quoted context omitted.

If you put a very light balloon in there won't the air pressure increase more than a smaller but heavier apple?

You put the object ontop of the bag, not in it

Ah! That makes a lot more sense now...

Re: The Plum-O-Meter: Weighing Plums Using 3D Touch in Swift

#30

Post by [deleted] » Thu, Nov 05, 2015, 10:05 PM UTC

userbinator wrote: post #13

cryptoz wrote: post #8

That's awesome. You can make a scale another way too, by using the barometer in the iPhone. You will need a ziplock or other airtight clear plastic bag, and an object of known weight for calibration. You can measure the change in air pressure in the bag with your iPhone inside, and put your object to weigh on top of the bag (carefully balanced). There is a linear relationship between the rise in air pressure and the…

Note that the bag must be extremely flexible for that to work. Otherwise the weight will be supported by the bag and the air pressure inside will be lower. For some reason, that reminds me of the classic "measure the height of a building using a barometer" joke.

[deleted]