Smart Home Blinds and Curtains Mobile App Development
Motorized blinds and curtains — one of the simplest IoT devices from a command perspective (open/close/position in percent), but with non-obvious UX and state synchronization nuances.
Device Types and Protocols
Somfy — premium motorized blinds market. RTS protocol (Radio Technology Somfy) — one-way, no feedback. You send a command, but don't know if it executed. Somfy TaHoma / connexoon — cloud hub with REST API, adds two-way communication for compatible devices. GET /enduser-mobile-web/1/enduserAPI/setup — get device list, POST /enduser-mobile-web/1/enduserAPI/exec/apply — execute command.
IKEA TRÅDFRI blinds — Zigbee, controlled via Zigbee2MQTT or Home Assistant. Support position (0-100%), tilt for blinds.
Tuya-compatible motors (most Chinese brands) — Tuya Open API or local protocol. "code": "percent_control", "value": 50 — set position 50%.
Matter over Wi-Fi/Thread — new devices. WindowCovering cluster, attribute CurrentPositionLiftPercentage. Matter SDK for iOS (MatterSupport framework, iOS 16.4+), Android — Google Home SDK.
Blind Control UI
Real-time visualization of blind position is the key interface element. Not just a percent number, but an icon or animation.
On Flutter: custom widget via AnimatedContainer + ClipRect. "Blind" rectangle animates from full size (closed) to zero (open). AnimationController with current device position. On new value via MQTT — animateTo(newPosition / 100) with ~500ms duration.
Position slider: same debouncing rule as dimmers. Somfy TaHoma accepts maximum 1 command per 2 seconds — on fast slider movement send only every 2nd second plus final value on onChangeEnd.
Scenes and Scheduling
"Morning wake" — blinds open gradually over 5 minutes at 7:30. Gradual open in Somfy: series of commands with intermediate positions. For Zigbee/Tuya: backend service sends commands via cron with increasing position values.
Light sensor reaction: if illuminance > 50,000 lux — lower south blinds to 30%. Light sensor (Aqara, Philips Hue) → MQTT → backend automation → command to motors. Mobile app only configures the rule, execution on server.
No Feedback Problem
Somfy RTS — typical device without reported state. Send "close" command, but how to know blinds closed? Two options:
Optimistic UI: update state in app immediately after sending command, don't wait for confirmation. User sees animation. If something went wrong — no way to know automatically, only manual refresh button.
External sensors: tilt angle sensor (accelerometer) or end switches. Data from them comes to MQTT — use as reported state.
Most products choose optimistic UI with explicit user warning that state is approximate.
Integration with Smart Home Systems
Blinds rarely managed in isolation. Scenarios: "Close all blinds + turn off lights in bedroom + turn on nightlight". Requires coordination with other subsystems via common automation engine.
If system already has Home Assistant — integrate via its REST API and WebSocket API. cover domain: POST /api/services/cover/set_cover_position with {"entity_id": "cover.living_room", "position": 50}. All devices from different protocols controlled via single API.
Timeline
One drive type (e.g., Tuya or Zigbee via hub), basic control, scheduling — 3–5 weeks. Somfy TaHoma, multi-manufacturer, group control, scenes with other devices — 8–12 weeks. Cost depends on set of supported devices.