Detects any up/down movement — mailbox lids, package bin doors, gates, hatches, cabinet doors, and more. One sensor. Endless applications. Instant email alert every time.
Any lid, hatch, gate, or surface that opens and tilts — the tilt sensor detects it. Normal polarity for downward-opening lids. Reverse polarity for upright-opening lids.
Mount the tilt sensor inside the mailbox lid wire path. The moment the carrier opens the lid, angle changes and the trigger fires. Works on standard US T2 and rural-style mailboxes.
Normal PolarityPackage and delivery bins with upright-opening lids (where the lid rises from horizontal to vertical) use reverse polarity mode. Detect every UPS, FedEx, and USPS drop without standing at the window.
Reverse PolarityKnow the moment a driveway gate, side door, or outbuilding door opens. Great for rural properties, vacation homes, or any access point that's out of sight from the main house.
Normal or ReverseBasement hatches, storm cellar doors, crawlspace access — any heavy lid that should stay closed. Get alerted the moment it opens, whether expected or not.
Normal PolarityElectrical panels, water shutoff compartments, irrigation control boxes — monitor access to any utility enclosure that should stay closed. Ideal for property managers and HOAs.
Normal PolarityThe tilt sensor is the foundation of the BoxBinAlert open platform. If it opens and tilts — in any direction — you can detect it. Makers and tinkerers use it for applications we haven't even thought of yet.
ConfigurableA small ball-bearing inside the tilt sensor rolls with gravity. When the lid changes angle, the ball rolls and completes (or breaks) an electrical circuit — firing the TX unit instantly.
Any movement — opening, closing, or tilting — shifts the orientation of the tilt sensor. Even a few degrees of angle change is enough to trigger.
The internal ball-bearing rolls with gravity. In normal polarity, the circuit breaks when the lid opens (ball rolls away from contact). In reverse polarity, the circuit breaks when upright (ball rolls away from opposite contact).
The circuit state change triggers the TX unit, which broadcasts a 915MHz LoRa radio signal. Range: up to 2 miles through walls, trees, and terrain.
The RX Receiver inside your home catches the signal and sends your email alert. The entire chain — tilt to inbox — completes in under 10 seconds.
The sensor rests with the lid closed (horizontal). When the lid opens downward or falls open, the angle change rolls the ball and fires the trigger.
For lids that open upward or rise to a vertical position. Reverse polarity flips the trigger logic — the sensor fires when the lid moves from closed (horizontal) to open (vertical).
Switch between normal and reverse polarity modes from the browser-based setup page. No hardware changes needed — it's a software setting.
Same installation process as the mailbox photo sensor — ½" hole, wire through, mount outside. Works on any application.
Drill a ½" hole in the bottom of your mailbox, package bin, or enclosure. This is the pass-through for the tilt sensor wire connecting the inside sensor to the outside TX unit.
Drill bit: ½ inchThread the sensor wire through the hole from outside in. The tilt sensor itself mounts inside the mailbox; the TX unit and battery stay protected outside on the post or underside of the box.
TX unit stays outside · weatherproofUse the included 3M zip-tie pad to secure the tilt sensor wire to the inside of the lid. When the lid opens, the sensor tilts with it. Position the sensor so the angle change on opening is maximized — typically near the hinge end.
3M zip-tie pad includedDuring the RX Receiver WiFi setup, select Normal or Reverse polarity based on your lid type. Standard mailbox lids = Normal. Upright-opening package bins = Reverse. You can change this anytime from the setup page.
Software setting — no rewiringMount the RX Receiver inside your home near a window. Connect to WiFi via phone browser. Enter your email. One-time setup — the system runs itself forever after.
One-time · 2-minute setupOpen the lid — you should receive an email within 10 seconds. If not, check polarity setting. Once working, you never need to touch it again. Battery lasts 6–24 months.
✓ Free alerts start immediatelyWorks in any light condition, any enclosure, any environment. Unlike the photo sensor which requires a dark interior, the tilt sensor works on gates, outdoor hatches, and any open-air application.
Ball-bearing contact sensors react in milliseconds. The trigger fires the moment the lid begins to move — no threshold calibration, no delay, no software debounce needed.
One sensor covers both downward-opening and upright-opening lids. Normal mode fires when a lid falls open. Reverse mode fires when a lid rises upright. Configure from software — no hardware changes.
Unlike a photo sensor, tilt detection doesn't care about light levels. Works in broad daylight, complete darkness, or inside opaque enclosures where no ambient light ever enters.
The tilt sensor draws power only at the moment of trigger. Between triggers, the circuit consumes near-zero power. Battery life ranges from 6 months (heavy commercial use) to 24 months (residential mailbox).
Same long-range 915MHz LoRa technology as all BoxBinAlert TX sensors. Gates, mailboxes, and outbuildings far from the house — all within range of one RX Receiver.
Same TX/RX system. Same free email alerts. Same range. The difference is detection method — choose based on your application.
Ships ready to install. Free email alerts. No subscription. No app. No catch.
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