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WIRELESS/RF: SenSiFi WiFi sensor module promises battery life of 3+ years

San Jose, Calif. – The SenSiFi module from Redpine Signals Inc. is an ultra low power WiFi sensor module based on 802.11n for building and deploying sensor networks in the industrial and enterprise arena. Designated as RS9110-N-11-31, the SenSiFi uses the company's ultra low-power Lite-Fi 802.11n technology.

The SenSiFi wireless sensor module is designed to provide a complete foundation for building sensor applications utilizing its onboard ultra low-power microcontroller and wireless sub-system. Through standard analog and digital sensor interfaces, it collects a full range of telemetry information, including temperature, humidity, motion, light, pressure, location, and battery level.

The microcontroller implements a small, embedded operating system on which multiple applications can be built. The fully self-contained module includes standards-compliant WLAN functionality with WPA2 security, a network stack that terminates TCP/IP and UDP connections with IPv6 capability, and configuration capability through UART or wireless.

The module also includes a built-in antenna, frequency reference, power management, and flashed-in firmware and is available in an easy-to-assemble 31mm x 44mm QFN package.

The SenSiFi module is based on Redpine's RS9110 SoC, which the company claims is the lowest power 11n single-stream solution available.

Conventional sensor solutions have used a number of wireless transmission methods including Zigbee, Bluetooth, and proprietary methods, while some use legacy 802.11b/g Wi-Fi, but as enterprise networks embrace the 802.11n standard, designers need a solution such as ours that supports the requirement for all clients, irrespective of bandwidth needs, to use the 802.11n protocol,” he added.

The SenSiFi module achives its extremely low power consumption using system-level and profile-driven fine-grained power control, a microcontroller with an ultra low-power mode working off a low-frequency clock source, and a WLAN subsystem with multiple power modes.

With a single 3V, 2000 mAh battery, and uploading sensor data every two minutes over an IPv6 framework, the wireless sensor module can achieve over three years of battery life.

The high-performance WLAN subsystem in the module further enhances range and effectiveness of data transfer, at the same time providing energy savings, according to the company.

The SenSiFi module is available for evaluation through a fully implemented evaluation board that integrates temperature, humidity, and pressure sensors, an accelerometer, battery management, full-functional firmware for WLAN protocol and device control, a configuration utility, and a web-based tracking application that provides a graphical representation of sensor data.

Redpine also provides sample sensor management functions on the microcontroller, along with APIs for applications development. The module is sampling now.

The SenSiFi module will be demonstrated at Redpine Signals' booth # 1606 at the Embedded Systems Conference being held in San Jose McEnery Convention Center from March 30 to April 3, 2009. A private demo and meeting can be scheduled with Redpine executives by sending an email to .

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