Nexus Cloudlet Rack
Obliczymy ostateczną cenę na podstawie wybranego pliku. Sprawdzisz ją i zaakceptujesz przed płatnością.
Zapisane na tym urządzeniu.
Modular Nexus 5 Smartphone Rack for DIY e-waste reuse Cloudlets.
- Ocena
- 0 / 5
- Polubienia
- 1
- Pobrania
- 22
- Wydruki
- 0
- Wyświetlenia
- 398
- Oceny
- 0
Aktualizacja u źródła:
Informacje o modelu
- Źródło
- Printables
- Kategoria
- Organizers
- Licencja
- Creative Commons — Attribution — Noncommercial — Share Alike
Introduction:
Electronic waste (e-waste) is a huge global problem, posing troubling environmental threats. Waste mobile phones are a big part of e-waste, mainly due to extreme demand & short product life-cycles.
While older smartphone models may be more compute & feature restrained, they provide an opportunity for affordable compute capabilities in under-privileged areas, where getting access to, for example, a Raspberry Pi is not possible.
The Nexus Rack is designed as a desktop storage rack for four Nexus 5 smartphones, operating as a distributed cloudlet compute cluster. I designed this rack for my colleague Perseverance Munga Ngoy's MSc thesis project where its also featured as “Cloudlet 3D rack prototype”: https://www.ims.ut.ee/www-public2/at/2024/msc/atprog-magistrit55-loti.05.036-perseverance-munga-ngoy-text-20231223.pdf (page 63)
Each Nexus 5 sits in their own cartridge unit, equipped with two power supply options & enabling easy maintenance access. In case one or more units require individual maintenance, the sliding cartridge design enables easy access to an individual Nexus 5 without having to shut off the rest of the setup, providing some basic quality of life upgrades. When fully fitted with four Nexus 5 smartphones, the rack weighs ~830g and typical externally measured extended compute load temperatures did not exceed 40 deg C.
Figure source: https://www.ims.ut.ee/www-public2/at/2024/msc/atprog-magistrit55-loti.05.036-perseverance-munga-ngoy-text-20231223.pdf (page 65)
Description:
Fits 4 Nexus 5 smartphones, each in its own cartridge. Each cartridge features a LM2596 DC-DC converter for powering each Nexus phone in case of faulty battery. The base houses an MH-KC24-4 USB DC Fast Charge Buck Converter Module. Four (4) individual (short) micro-USB cables connect the fast charge USB module to each Nexus 5 in its own cartridge.
Threaded heat-inserts not required typically. Additional mounting screws needed for:
- Cartridge:
- Nexus 5 slides into place
- LM2596 needs two M3 screws
- Base, Lid & MH-KC24-4:
- Need 4x M3 Hex countersunk screws
BOM:
| Item | # | Comment |
| Cartridge | 4 | Each cartridge can hold one Nexus 5 and one LM2596 converter (optional). The Nexus 5 sits snug inside the main body but is not retained by any means, however, a rubber band would suffice. Recommend gentle hot air preheat of each base lid slot before inserting a cartridge for the first time. This ensure a secure, tight fit. |
| Nexus 5 Smartphone | 4 | In case of faulty battery, recommend using the LM2596 DC-DC converter as backup. Can often find this model in land-fills, online (eg. eBay) and your local flea market. |
| LM2596 DC-DC converter | 4 | Included as optional backup in case of a faulty Nexus 5 battery. |
| Rack Base | 1 | Tidy base to securely hold all components & provide some stability. Recommend adding rubber anti-slip self-adhesive standoffs. |
| MH-KC24-4 USB | 1 | USB DC fast charge buck converter module. |
| Rack Lid | 1 | Recommend gentle hot air preheat of each base lid slot before inserting a cartridge for the first time. This ensure a secure, tight fit. |
| Stabilizer Bracket | 1 | This is an optional stabilizer bracket that helps lock the cartridges in place. |
| M3x12mm Hex Countersunk Screw | 17 | If not using the stabilizer only 12 screws are necessary. |
| USB A (male) to micro-USB (male) | 4 | To power each Nexus 5 conventionally (USB), need 1 (very short) cable for each cartridge in use, up to four (4) cables. In the shown build I manually cut & re-soldered long, cheap USB cables to shorter length but the end result was not pretty. 10-15 cm length should be fine. |
Fusion360 archive files include the individual part files, design history and the models of the Nexus 5, LM2596, MH-KC24-4, screws and USB connectors.