Augmenting everyday surfaces with interaction sensing capability that is maintenance-free, low-cost (about $1), and in an appropriate form factor is a challenge with current technologies. MARS (Multi-channel Ambiently-powered Realtime Sensing) enables battery-free sensing and wireless communication of touch, swipe, and speech interactions by combining a nanowatt programmable oscillator with frequency-shifted analog backscatter communication. A zero-threshold voltage field-effect transistor (FET) is used to create an oscillator with a low startup voltage (about 500 mV) and current (< 2uA), whose frequency can be affected through changes in inductance or capacitance from the user interactions. Multiple MARS systems can operate in the same environment by tuning each oscillator circuit to a different frequency range. The nanowatt power budget allows the system to be powered directly through ambient energy sources like photodiodes or thermoelectric generators. We differentiate MARS from previous systems based on power requirements, cost, and part count and explore different interaction and activity sensing scenarios suitable for indoor environments.
翻译:以无维护、低成本(约合1美元)和适当形式的互动感测能力增强日常表面,这是当前技术面临的一项挑战。 MARS(MARS(Multi-Channel Abel Environtive-Amertial Serental Servication)使无电池的感应和无线的触碰通信、擦线和语音互动能够将纳米瓦可编程振荡器与频率转换的模拟后向散射通信相结合,从而实现无声波波波波振荡器(FET)的增强。 纳米电能预算允许通过光层或热电发电机等环境能源源直接为系统提供动力。 我们根据电源要求、成本、部分计算以及室内活动与探索的不同互动环境,根据电源要求、成本、部分计算以及室内活动与不同互动情况,将MARS系统与以往系统区分开来。