Skip to Content

Apple Pencil Used as Weight Scale, Synthesizer and 3D Image Editing Controller

by

While the Apple Pencil is designed as a sketching tool for creative professionals, MacRumors reader Simon Gladman has created three Swift demo apps that show the accessory being used for three unconventional purposes -- as a weight scale, controlled synthesizer and 3D controller for image editing.

PencilScale


PencilScale, based on Goodman's Plum-O-Meter, is an experimental app that uses a homemade harness to turn the Apple Pencil into an electronic scale that is highly sensitive, but not incredibly accurate.

The experiment works by subtracting the touch's force from a base weight, which is "set as the current touch force when the 'zero' button is pressed," and multiplying it by 140 for a very rough weight in grams.

PencilSynth


PencilSynth is an AudioKit-powered synthesizer that can be controlled by the Apple Pencil depending on its orientation and position.

  • Apple Pencil's horizontal position on the screen controls frequency

  • Apple Pencil's vertical position on the screen controls the modulating multiplier

  • Apple Pencil's altitude angle controls the carrier multiplier

  • Apple Pencil's azimuth angle controls the modulation index

PencilController


PencilController is an experimental image processing app that uses the Apple Pencil as a controller for the fine setting of parameters on Core Image filters.

The demo has three image filtering modes:

  • Hue/Saturation - Apple Pencil's azimuth angle controls hue and its altitude angle controls the saturation

  • Brightness/Contrast - Apple Pencil's altitude angle along North/South controls contrast and the angle along West/East controls brightness

  • Gamma/Exposure - Apple Pencil's altitude angle along North/South controls exposure and the angle along West/East controls gamma

Gladman explains that "the app uses a spring loaded pattern, so the user needs to hold down one of the mode keys in the bottom left of the screen to stay in the filtering mode."

The source code for all three projects is available on GitHub.

Related Roundup: iPad Pro
Buyer's Guide: iPad Pro (Buy Now)
Related Forum: iPad Accessories

Top Rated Comments

FlexMonkey Avatar
135 months ago
I know this is sounds cool. But come on guys I'm tired of hearing this non-sense use of technology. There is abviously a much better device for such thing and it doesn't cost a lot of money to have one. I'm talking about the scale and somebody did it on iPhone 6S 3D Touch too. It's because you can it doesn't mean you have too.
Hi!

I'm actually the same guy that did the "Plum-O-Meter" for weighing things on an iPhone :)

Of course there are better devices, but I'm interested in experimenting, tinkering and playing then seeing what results. Actually, using the Pencil as a controller works really well for the fine adjustments in the image processing app and the fact the it has five degrees of freedom makes it a unique input device for the audio app.

Without some left field thinking, we'd all be using abacuses!

Cheers!

Simon
Score: 16 Votes (Like | Disagree)
135 months ago
Aren't the phrases "Highly Sensitive" and "Not Incredibly Accurate" a bad combination under pretty much any circumstance?

.....As a side note, those two phrases remind me of almost every girlfriend I've ever had, the first phrase typically causing the second.... ;)
Score: 7 Votes (Like | Disagree)
teslo Avatar
135 months ago
I know this is sounds cool. But come on guys I'm tired of hearing this non-sense use of technology. There is abviously a much better device for such thing and it doesn't cost a lot of money to have one. I'm talking about the scale and somebody did it on iPhone 6S 3D Touch too. It's because you can it doesn't mean you have too.
yeah, why would anyone ever want to do things?

i, for one, am witnessing exactly what i'd hope would start happening upon the release of a new device: tinkering, feedback, and constructive criticism. i'm sorry you're tired, i hear energy drinks are all the rage nowadays.
Score: 6 Votes (Like | Disagree)
135 months ago
Aren't the phrases "Highly Sensitive" and "Not Incredibly Accurate" a bad combination under pretty much any circumstance?
Nope, from a scientific terminology perspective, that actually makes perfect sense.

Accuracy, scientifically speaking, is how close to the real value a measurement will produce.

Precision (aka sensitivity) is how small of a quantity you can measure, accurately or otherwise.

And repeatability is how close to the same value taking the same measurement at two different times will produce, accurately, precisely, or otherwise.

So: An accurate scale will tell you something weighs 502 grams when it weighs 502 grams. A precise scale will tell you that something weighs 498.93 grams, although it might actually weigh 502.00 grams if the scale is not also accurate. And a repeatable (and precise) scale will tell you that something weighs 498.93 grams every time you weigh it, although if it's not also accurate it might really weigh 502 grams.

This particular "scale", silly or otherwise, will give you a lot of digits of precision on the weight measurement, so it's quite precise. It however isn't calibrated at all, so the accuracy is bad. No idea whether it's repeatable or not.
Score: 5 Votes (Like | Disagree)
nagromme Avatar
135 months ago
Think what you could do with 3 pencils! You could control that synthesizer with one, and jam the other 2 in your ears until the racket stops.
Score: 4 Votes (Like | Disagree)
135 months ago
I know this is sounds cool. But come on guys I'm tired of hearing this non-sense use of technology. There is abviously a much better device for such thing and it doesn't cost a lot of money to have one. I'm talking about the scale and somebody did it on iPhone 6S 3D Touch too. It's because you can it doesn't mean you have too.
Score: 3 Votes (Like | Disagree)

Popular Stories

Apple Event Logo

Apple Released Seven New Products Today

Wednesday March 11, 2026 7:05 am PDT by
Starting today, the seven new Apple products that were announced last week are available at Apple Stores and beginning to arrive to customers. The colorful MacBook Neo and all of the other new products are on display at most Apple Store locations around the world starting today. Apple Stores have inventory of the new products for both walk-in customers and Apple Store pickup, but...
iOS 27 Mock Quick

10+ New Features Coming in iOS 27

Friday March 13, 2026 2:13 pm PDT by
We're only three months away from Apple's WWDC 2026 event, which will see the company unveil iOS 27. With the fully revamped version of Siri possibly delayed until September, iOS 27 is shaping up to be the update we wanted iOS 26 to be. There will be new Apple Intelligence features, updates for the iPhone Fold, and more, with the latest rumors summarized below. Foldable iPhone Features...
Apple 50 Years of Thinking Different

Apple Announces 50th Anniversary Plans

Thursday March 12, 2026 6:10 am PDT by
Apple today announced that it will celebrate the company's 50th anniversary over the coming weeks, but it has yet to reveal any specific plans. Apple was founded on April 1, 1976, so the company will turn 50 on April 1, 2026. "While Apple is known for looking forward, this milestone offers a special moment to reflect on the journey that has brought the company here, to celebrate the...