For friends in automation, robotics and mechanical design · 2026.10.13
Three bins travel down and back up a hillside every week. Four households also share a crowded collection point with about twelve bins. Could an existing powered platform, thoughtful fixtures and limited automation make the whole job easier?
01 / The problem and intended outcome
At my Marin hillside home, bins are stored on the deck outside the kitchen. Taking them out means a narrow passage, a parking-area turn, a small uphill section and crest, then downhill curves. The bins must come back afterwards. I am looking for a permanent household tool, and would appreciate an independent engineering judgment before committing to a design.
One powered device handles our three bins. Compare sequential single-bin trips with moving several together. Start with a person present, low-speed assistance and reliable stopping; fixed-route autonomy is a later option.
Four households share about twelve mixed-size bins. Compare a button-indexed carousel with fixed numbered storage and single-bin transfer. Keep the original bay empty and locked while the truck is emptying its bin.
These are separate problems. A collection station does not replace uphill transport. Future unattended operation on a shared driveway must handle vehicles, obstacles, a safe waiting position and manual recovery.
Existing 96 US gal bin width: about 27.6 in / 70 cm. Gate: about 37.4 in / 95 cm. Proposed complete loaded width: 28.3–29.5 in / 72–75 cm, not a verified clearance. Full-bin mass, center of gravity, cross-slope, turns, crests and station footprint remain unknown. I intend to replace our two 96 gal bins with 64 gal; this has not happened and neighbors' bins are not standardized.
02 / Options to compare
New owner annotation · 2026.10.13
The owner's red segment follows the privacy-fence side of the slope. The blue segment is the lower portion of the owner's driveway; beyond it lies a neighbor's driveway. Only the red segment is being considered for fixed rails. A gravel strip carries rainwater and contains plants. A lemon tree requires a detour; bends, endpoints and property boundaries need field confirmation.
Abstract diagram from the owner's annotation, not a survey, scale map or permission to build. The twenty-plus-meter length is a concept estimate.
May simplify components, but can add stopping, securing, hooking and reloading at both ends. Measure total task time, remaining manual hauling and return work.
Concept: keep the bins on one wheeled carrier, engage controlled guidance or positive drive on the red segment, disengage at a secured endpoint and continue on wheels. Mode transitions, anti-runback, loss-of-power holding and non-rail operation need validation.
Do not assume a single side rail supports every load or prevents rollover. Design rail/wheel load sharing, an independent foundation, bends, lateral forces and drainage clearance. The wooden privacy fence is not a proven structural support. Max Maker's rack-drive upgrade is an inspiration, not proof for this route. Rack upgrade at 5:57 ↗
03 / Market and price: facts versus assumptions
Start with homes where repeated bin handling on a long or sloped route is inconvenient, existing workarounds are inadequate and owners value reduced effort. The model under consideration is household equipment with site adaptation: separately price the platform, fixture, installation, commissioning and support.
The DOF total includes vacant and rental units. It is neither a count of hillside mansions nor buyers or annual sales. Income is county background, not the target segment's income. DOF dataset ↗ · Census QuickFacts ↗
This research has not found a published countywide housing count or share. Public data exists to calculate a defined estimate. Marin County provides parcel/address data; MarinMap provides ground DEM and a Slope service. Overlay the housing inventory with terrain, rather than applying the county's sloping-land area percentage to housing units.
One analysis could report sensitivity at natural grades ≥10%, ≥20% and ≥30%, separating parcel-average terrain, surroundings of the building and actual driveways. These are analysis thresholds, not a single legal definition. Verify raster units, missing values, housing classification, coverage date and multi-dwelling parcels. Match numerator and denominator: parcel counts cannot simply be divided by DOF dwelling-unit counts.
A hillside home does not automatically mean difficult bin handling. Standard curbside service involves presenting bins, but bins may already sit near the road, a driveway may be flat or an owner may have vehicle assistance. Mill Valley Refuse documents hills, narrow streets and manual collection; qualifying elderly or disabled customers may arrange property collection. Terrain, handling difficulty and willingness to buy are different measures.
County GIS ↗ · Ground DEM ↗ · Slope service ↗ · Local collection practice ↗
Sources exist; the countywide overlay has not been performed. Hillside housing share remains unknown. The 5%, 10% and 15% below are assumed pain incidence, not measured hillside proportions.
For a household transport tool at an assumed US$4,000–6,000 installed price, with reliable safety and service. The shared twelve-bin station is a different installation product; these counts do not apply to it.
| Case | Pain | Deployable | Purchase | Illustrative buyer stock |
|---|---|---|---|---|
| Low | 5% | 50% | 15% | ~260 |
| Middle | 10% | 60% | 25% | ~1,030 |
| High | 15% | 70% | 35% | ~2,520 |
The wide range reflects uncertainty, not measured market size. At the middle assumptions, reaching 20% of buyers over five years would mean only about 41 sales a year. This is also unvalidated. Marin could be a pilot location; current evidence does not establish a large standalone business.
US$4,000–6,000 is an interview hypothesis, not a supplier quote or customer commitment. Determine US delivery, commissioning, support and failure costs. Station foundations and shared maintenance are separate.
Example assumptions: save 15 minutes a week, or 13 hours a year; pay $4,000 upfront plus $200 annual upkeep. Five-year cost is $5,000, about $77 per hour saved. This is not cash income; hookup, unloading and faults reduce the benefit.
A later pilot could interview 10–20 households and measure several real routes. Compare existing assistance and tools, repeated use, willingness to pay and maintenance. A shared station also requires agreement over space, cost and responsibility.
No further manufacturer, neighbor, municipal or hauler outreach has been made for this update.
04 / What I would like your help with
Separate transport from collection-station handling. Identify likely failure modes, usable platforms and genuinely custom parts.
A sketch, component list, missing measurements and controlled loaded-bin / handoff tests. Keep total user effort in view.
Estimate development, unit delivery, site adaptation and maintenance. Decide whether this fits small-batch integration or possible standardization.
05 / Source references — expand as needed
The first three links are original creators' YouTube videos. These demonstrate prior work, not 18° loaded performance, safe 12° release or compatibility with this shared driveway.
A powered locomotive and bin platforms move on a fixed track. Arduino's project account describes insufficient grip / power with a wiper motor and rubber wheel, followed by a rack-and-pinion upgrade and endpoint charging.
Useful for mechanical guidance and repeatable endpoints. Track installation on a shared driveway and this route's 18° loaded braking remain unverified.
An actual self-driving bin prototype and public code, including garbage-truck model training and Jetson / Raspberry Pi runtime instructions. Detecting a truck does not establish collision avoidance, slope holding or safe lift compatibility.
The author describes a design by his brother that travels out on collection days and returns home. No verified loaded slope, power-loss holding or shared-driveway performance is established.
Original demonstration ↗Gizmodo's September 30, 2019 X post shows the curb-delivery concept. NERC's May 22, 2024 description concerns weighing and waste data. These are not evidence of a currently purchasable autonomous hillside transporter.
Useful tilt, coupling and pin references. The company's instructions prohibit backing up with bins attached. That is a direct mismatch with the desired uphill-side powered head reversing downhill.
Creator pages, descriptions and chapters were checked; videos are not treated as full engineering tests. X live search required login, so the historical public post was used. Public code is a research reference, not a validated safety controller or a confirmed commercial license.
For a tow arrangement on the main incline, keep the powered head uphill: reverse downhill while restraining the bin load, pull forward uphill. Small uphill sections, crests, braking and turns change connection loads; all conditions need review. A rigid carrier avoids some tow joints but still needs traction, clearance and rollover checks.
Reported full route: about 256 ft / 78 m. A 111 ft / 33.8 m subsection has unconfirmed endpoints. Phone readings were confirmed as degrees: 15° = 26.8%, 18° = 32.5%, 20° = 36.4%, 22° = 40.4%. The 18° transport design target is not a surveyed route maximum. The 12° endpoint reading lacks a recorded longitudinal / transverse direction. Extreme 20–22° spots have not been fully excluded from the swept path.
A curved ground-DEM candidate is retained at about 246 ft / 75.1 m, with 1 m samples and 2 / 5 / 10 m windows. Its start is not the deck. A deck surface, narrow-passage tie-in, tree-covered pavement, walls and local raised areas remain unresolved. Project-wide vertical accuracy is not local road accuracy. No surveyed maximum or reliable cross-slope is claimed.
The county 2018–2019 LiDAR product report describes a delivered 1.5 US survey ft / ~0.46 m DEM. The service uses EPSG:2872 HARN; the delivery report's reference differs and requires verification. Ground-classified LAS / LAZ and local pavement returns have not been independently checked.
Review normal descent, stopping distance, heat buildup, power-loss holding and full-battery limits on regeneration. A stated climbing capacity or electromagnetic parking brake does not establish the whole system's downhill safety. Secure the whole vehicle, independently support / stop the bin, then release it; do not ask a person to catch a rolling loaded bin.
Images below are references, not purchase recommendations or proof of this route's rated performance. Owner-provided advertisements retain their original language. The existing three-bin 3D carrier is a kinematic concept; wheel directions are idealized rather than dynamically controlled.
A 1,200 mm fork, low front rollers, an outdoor-grip claim or a “slope brake” advertisement does not by itself solve three-bin packaging, curved pavement, braking attachment loads or unload effort.