What it does
Triggers an automatic door through hands-free, assistive, or caregiver-controlled intent signals.
Retrofit installExisting button preservedNo-camera modesPilot-ready reference design
Accessible Entry / Assistive Tech / Retrofit Door Access
Hands-free door access for safer, easier entry.
A retrofit access module that lets users trigger an automatic door without reaching for the wall button, while preserving the existing accessible button.
Retrofit access module
NFC
Switch
Phone
How it installs
Adds a relay path in parallel with the existing accessible push button so manual operation remains intact.
How it stays guarded
Uses debounce, confirmation timing, cooldown, and optional multi-signal gating before activation.
Product Overview
A practical access layer for doors people already use.
Automatic doors still fail some users when the only accessible control is a wall plate they cannot reach, press, or line up with consistently.
The retrofit path must trigger the door safely, reject noisy intent signals, preserve the original button behavior, and adapt to the timing and traffic patterns of each doorway.
NFC tap
A badge, card, or tag can trigger entry without reaching for a wall plate.
Assistive switch
Works with simple adaptive switches already familiar to the user.
Phone trigger
Optional app or web trigger for caregivers, staff, or authorized users.
Proximity mode
Wave-to-open or close-range detection can be tuned to the doorway.
Installation
Retrofit without removing the original button.
The controller is designed to close a relay contact in parallel with the existing accessible push-button input. The original wall button remains the primary fallback path.
- Targets dry-contact style accessible button interfaces.
- Supports site-specific timing, input thresholds, and cooldown behavior.
- Keeps manual door activation available during testing and operation.
1
Intent input
NFC, switch, phone, or proximity signal
2
Safety logic
Confirm, gate, activate, cooldown
3
Relay output
Parallel trigger path to door operator
4
Manual fallback
Original button remains available
Safety
Guarded activation before the door opens.
The goal is not just hands-free entry. The product has to reject noise, avoid rapid repeated triggers, and keep a manual fallback available.
Safety controls
- Debounce and confirmation windows reduce transient trigger risk.
- Cooldown prevents rapid repeated activations.
- Manual override path remains available through original button hardware.
False activation mitigation
- Threshold and timing logic gate uncertain detections.
- Optional multi-signal confirmation can be enabled per deployment mode.
- Time-based gating limits unintended re-trigger behavior.
Test plan
- Bench tests planned for trigger latency and repeatability.
- False-open rate tracking planned under noisy-input scenarios.
- Cooldown and recovery behavior planned for fault-injection checks.
Best Fit
Built for pilots in real accessibility environments.
This is positioned as a pilot-ready reference design for a specific doorway, user workflow, and safety profile.
Homes
Bedroom, garage, entry, and interior-access routes.
Clinics
Therapy rooms, care areas, and staff-assisted entry.
Schools
Classrooms, labs, and accessibility-focused pilot areas.
Product Specs
Product type
Retrofit hands-free door access module
Access modes
NFC, assistive switch, phone trigger, proximity or wave-to-open modes
Output type
Relay contact (parallel trigger path)
Installation mode
Parallel with existing accessible button
Controller
ESP32-class embedded controller
Logging
Local event logs with optional cloud-sheet export
Connectivity
BLE / Wi-Fi (config dependent)
Pilot Package
- Door compatibility review
- Access mode selection
- Safety timing profile
- Bench validation plan
- Installation handoff notes
Architecture
Technical artifacts are still available.
The page leads with the product. The system diagram remains available for engineering review and implementation planning.
Open architecture overview
FAQ
Common deployment questions.
Will it break the existing door button?
No. The relay path is designed in parallel so the original accessible button continues to function.
How do you prevent accidental opens?
The logic uses debounce, confirmation windows, and cooldown timing, with optional multi-signal gating.
Can it work without a camera?
Yes. NFC, assistive switch, app trigger, and proximity-only modes can be used in no-camera configurations.
Does it store personal data?
Logging is event-focused and can be configured to minimize stored personal data according to deployment policy.
What door systems is this compatible with?
This reference design targets systems that accept a dry-contact style trigger path similar to accessible push-button interfaces.
Accessible entry pilot
Have a doorway or workflow in mind?
I can help evaluate the access mode, relay path, safety timing, and validation plan for a specific home, clinic, or school environment.