Slinging.org Forum - Digital sling ammo

NooneOfConsequence

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Digital sling ammo
Mar 16^th, 2026 at 7:36pm

Hey everyone. I haven’t been on here much, but that doesn’t mean I haven’t been busy slinging!

Ok, this is very much a work in progress, but I just cobbled together a sling bullet with a built-in motion sensor. It provides 3-axis acceleration, gyroscope, and magnetometer data. All in its about $30 worth of stuff mostly from Adafruit. If anyone wants to build their own, let me know.

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“My final hour is at hand. We face an enemy more numerous and cunning than the world has yet seen. Remember your training, and do not fear these unholy hordes. I shall cast the first stone. That will be your sign to attack! But you shall not fight this enemy with stones. No! RAZOR GLANDES! Aim for the eyes! May the Lord have mercy, for we shall show none!“ -Jesus the Noodler (not the real Jesus)

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erricrice Senior Member Offline reformed spaghetti enthusiast Posts: 409 Clearwater, FL	Re: Digital sling ammo Reply #1 - Mar 16^th, 2026 at 8:05pm Whoa! Very cool. Will be very interesting to see what sort of data you get off of it! Not sure I'm ready yet to dive into that level of detail myself too much other random stuff to test first!
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An_Origamian Novicius Offline Slinging Rocks! Posts: 9 Gender:	Re: Digital sling ammo Reply #2 - Mar 16^th, 2026 at 9:34pm Oh very nice. I don't plan on replicating it, but I would like a schematic or at least the numbers of the parts you used.
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joe_meadmaker Slinging.org Administrator Offline Slinging Ice is Cool! Posts: 3833 PA, USA	Re: Digital sling ammo Reply #3 - Mar 16^th, 2026 at 10:05pm Amazing!
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Rat Man Slinging.org Administrator Offline Slinging Rocks! Posts: 14185 New Jersey, USA Gender:	Re: Digital sling ammo Reply #4 - Mar 17^th, 2026 at 2:13pm Ditto: Amazing!
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irgendeinekiwi Descens Offline Posts: 125 Europe Gender:	Re: Digital sling ammo Reply #5 - Mar 17^th, 2026 at 4:52pm I could rustle up a 3D printed housing for you
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NooneOfConsequence

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Re: Digital sling ammo
Reply #6 - Mar 20^th, 2026 at 11:21pm

irgendeinekiwi wrote on Mar 17^th, 2026 at 4:52pm:

I could rustle up a 3D printed housing for you Wink

Thanks! I could crank something out on my printer pretty easily too, but I’m much more comfortable using foam around the lipo battery! The best thing to do would be to design a custom PCB with a coin cell holder on it, upgrade the microcontroller to an esp32 for wireless data transfers, and then integrate the whole thing into a balanced glande with extra ballast… but I wanted to prove out the concept with what I had lying around first Cheesy

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“My final hour is at hand. We face an enemy more numerous and cunning than the world has yet seen. Remember your training, and do not fear these unholy hordes. I shall cast the first stone. That will be your sign to attack! But you shall not fight this enemy with stones. No! RAZOR GLANDES! Aim for the eyes! May the Lord have mercy, for we shall show none!“ -Jesus the Noodler (not the real Jesus)

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NooneOfConsequence

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Re: Digital sling ammo
Reply #7 - Mar 24^th, 2026 at 4:18pm

Minor update: threw a snap-together biconical housing together… major improvement in the packaging!

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“My final hour is at hand. We face an enemy more numerous and cunning than the world has yet seen. Remember your training, and do not fear these unholy hordes. I shall cast the first stone. That will be your sign to attack! But you shall not fight this enemy with stones. No! RAZOR GLANDES! Aim for the eyes! May the Lord have mercy, for we shall show none!“ -Jesus the Noodler (not the real Jesus)

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irgendeinekiwi Descens Offline Posts: 125 Europe Gender:	Re: Digital sling ammo Reply #8 - Mar 24^th, 2026 at 7:46pm Does it transmit telemetry data?
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NooneOfConsequence

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Re: Digital sling ammo
Reply #9 - Mar 26^th, 2026 at 5:10pm

irgendeinekiwi wrote on Mar 24^th, 2026 at 7:46pm:

Does it transmit telemetry data?

Unfortunately this version does not. This is literally a bunch of leftover electronics that I found lying around, and I definitely would not have chosen all of these components if I was designing something from scratch and willing to pay for parts. You have to download the data from internal memory using a serial terminal… super clunky and difficult to use, but it was 100% free because I already had all the parts!

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“My final hour is at hand. We face an enemy more numerous and cunning than the world has yet seen. Remember your training, and do not fear these unholy hordes. I shall cast the first stone. That will be your sign to attack! But you shall not fight this enemy with stones. No! RAZOR GLANDES! Aim for the eyes! May the Lord have mercy, for we shall show none!“ -Jesus the Noodler (not the real Jesus)

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BensBestBentWire Novicius Offline Slinging Tennis Balls Rocks! Posts: 5 Massachusetts Gender:	Re: Digital sling ammo Reply #10 - Apr 13^th, 2026 at 10:01am NooneOfConsequence wrote on Mar 24^th, 2026 at 4:18pm: Minor update: threw a snap-together biconical housing together… major improvement in the packaging! Do you have an STL? Have you considered a think 100% infill TPU shell? This could offer MUCH more durability.
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NooneOfConsequence

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Re: Digital sling ammo
Reply #11 - Apr 17^th, 2026 at 10:09pm

BensBestBentWire wrote on Apr 13^th, 2026 at 10:01am:

NooneOfConsequence wrote on Mar 24^th, 2026 at 4:18pm:

Minor update: threw a snap-together biconical housing together… major improvement in the packaging!

Do you have an STL? Have you considered a think 100% infill TPU shell? This could offer MUCH more durability.

You may be solving the wrong problem here. Durability is not the issue. The logger survives and collects data just fine… but the accelerometer is only good up to 16G’s, so it maxes out as soon as it leaves the sling pouch and the data is useless during past the release point.

But of course if you want an stl for the 3d printed shell I can get it to you. I actually have one version that has a tight snap fit and a second version that is looser so you can deploy payloads from the shell mid-flight… but I’m still working out the kinks on that use-case.

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“My final hour is at hand. We face an enemy more numerous and cunning than the world has yet seen. Remember your training, and do not fear these unholy hordes. I shall cast the first stone. That will be your sign to attack! But you shall not fight this enemy with stones. No! RAZOR GLANDES! Aim for the eyes! May the Lord have mercy, for we shall show none!“ -Jesus the Noodler (not the real Jesus)

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BensBestBentWire Novicius Offline Slinging Tennis Balls Rocks! Posts: 5 Massachusetts Gender:	Re: Digital sling ammo Reply #12 - Apr 19^th, 2026 at 10:54pm Good to know. I am totally still interested in any stls you have for this
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