Though buttons have gone through a few changes over the years, at the end of the day, you push or tap one, and it responds with an action. The tapdo, now available on Kickstarter, takes things in a different direction by turning your hand into a remote control — using a single button to trigger different actions depending on what finger or thumb, and even what section of it is used to touch the device.
The tapdo works on the principle that while your fingerprints are unique, so is the rest of your hand. The tiny button-sensor detects what part of your hand you tap it with and responds appropriately. Responses can be activated via BLE, and include shortcuts relating to your favorite phone apps, smart home technologies, and other tricks that they — and you using their open API — come up with in the future!
In terms of hardware, the tapdo is based on an ARM Cortex-M4F MCU with encryption, a Bluetooth module, a capacitive fingerprint scanner, a coin cell battery, and a vibration motor for haptic feedback. It is worn in the form of a wristband or clipped onto your belt, pocket or watch strap.