Want to Order a Pizza? Knocki Three Times on the Wall

The Clapper laid the home-automation groundwork. Now, a Texas startup says it has developed an IoT analog that is more foolproof and versatile.
By Mary Catherine O'Connor
Aug 14, 2015

If you have spent any time in front of a television, late at night, at any point in the last few decades of the 20th century, you can very likely sing the jingle for The Clapper, a sound-activated electrical switch. Maybe you even had one. Or maybe you have one still. It turns out that The Clapper—used to control the electrical power to any device plugged into it when it detects a user clapping—is still on the market. In fact, it's currently ranked number four among Amazon's best-selling home-automation devices.

However, The Clapper recently got a new competitor: the Knocki. Instead of responding to sounds, the Knocki uses an accelerometer to detect vibrations, transmitted via a person knocking on a wall or countertop near the device. A single knock awakens the unit, which then listens for one of several preset patterns that the user sets up via the Knocki app for iOS and Android smartphones and tablets, or at the Knocki website. An algorithm running on the device's microcontroller interprets the knocking pattern before triggering the command to which it was matched when the user initiated the device. "Vibrations that are irregular won't trigger Knocki to do anything," says Jake Boshernitzan, a co-founder of Texas-based Swan Solutions, Knocki's creator. "So you don't have to worry about a heavy truck hitting a pot hole in the street or kids banging on the kitchen table."

The Knocki uses an accelerometer to detect vibrations, transmitted via a person knocking on a wall or countertop near the device.
A user who tends to misplace her mobile phone inside the house, for instance, might set up a Knocki unit to trigger an audio alarm on her phone whenever she knocks once to awaken the device and then three times, quickly, on the wall or countertop. The Knocki can reliably detect a knock within 6 feet through wood or drywall, Boshernitzan says, but denser materials, such as granite or marble, have a shorter range. Or perhaps a consummate bachelor would establish a signal—one knock, pause, three more—to trigger his smartphone to order a pizza via a restaurant app. The algorithm ensures that random vibrations, such as a passing heavy truck or a slamming door, will not trigger the Knocki, Boshernitzan explains.

Knocki comes with a few pre-set functions, and users can employ application programming interfaces (APIs) through the Knocki website or mobile app to enable the device to control some smart-home products made by Wemo, Insteon and Philips Hue. According to Boshernitzan, Knocki users will also be able to set up custom functions by using If This Then That software.

The device runs on AA batteries, with an expected year of life under regular use. It communicates via a Wi-Fi connection, meaning that a user need not rely on a smartphone to set up or program a Knocki. Instead, a Knocki owner can do this via the Web browser running on his laptop or tablet PC.

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