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Telos Fourth Generation WSN Platform

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Presentation on theme: "Telos Fourth Generation WSN Platform"— Presentation transcript:

1 Telos Fourth Generation WSN Platform
Joseph Polastre UC Berkeley Moteiv Corporation Develop control abstraction

2 Design Principles for WSN Platforms (from HotChips 2004)
Wireless Sensor Networks Must operate for many years Need low duty cycles to achieve long lifetimes Key to Low Duty Cycle Operation: Sleep – majority of the time Wakeup – quickly start processing Active – minimize work & return to sleep

3 Sleep Majority of time, node is asleep Minimize sleep current through
>99% Minimize sleep current through Isolating and shutting down individual circuits Using low power hardware Need RAM retention Run auxiliary hardware components from low speed oscillators (typically 32kHz) Perform ADC conversions, DMA transfers, and bus operations while microcontroller core is stopped

4 Wakeup Overhead of switching from Sleep to Active Mode Microcontroller
Radio (FSK) 292 ns 10ns – 4ms typical 2.5 ms 1– 10 ms typical

5 Active Microcontroller Radio External Flash (stable storage)
Fast processing, low active power Avoid external oscillators Radio High data rate, low power tradeoffs Narrowband radios Low power, lower data rate, simple channel encoding, faster startup Wideband radios More robust to noise, higher power, high data rates External Flash (stable storage) Data logging, network code reprogramming, aggregation High power consumption Long writes Radio vs. Flash 250kbps radio sending 1 byte Energy : 1.5mJ Duration : 32ms Atmel flash writing 1 byte Energy : 3mJ Duration : 78ms

6 Telos New design started in September 2003 Principles
>12 months of work by 2+ grad students Principles Easy to use Standards based Lowest power consumption Low standby/active current, short wakeup times

7 Telos Platform Low Power Robust Standards Based High Performance
Minimal port leakage Hardware isolation and buffering Robust Hardware flash write protection Integrated antenna (50m-125m) Standard IDC connectors Standards Based USB IEEE (CC2420 radio) High Performance 10kB RAM, 16-bit core, extensive double buffering 12-bit ADC and DAC (200ksamples/sec) DMA transfers while CPU off

8 Telos Meeting the Low Power Goal
All values measured at room temperature (approximately 25oC) at 3V supply voltage Source: “Telos: Enabling Low Power Wireless Sensor Network Research” To appear, IPSN/SPOTS, April 2005

9 Telos Performance 200ksamples/sec sampling rate, DMA transfers, DAC
Increased performance & functionality over existing designs New “link quality indicator” predicts average packet loss Flat field range 4” off ground 1m elevation) Distance (ft) Packet Success Average LQI RSSI

10 Prometheus: Perpetually Powered Telos
Duty Cycle Light Required System Lifetime 1% 5 hrs / 1 mo 43 years 10% 5 hrs / 4 days 4 years 100% 10 hrs / 1 day 1 year Solar energy scavenging system for Telos Super capacitors buffer energy Lithium rechargeable battery as a emergency backup Possible due to low voltage (1.8V) and low power (<15mW) consumption of Telos Visit the poster later today… Source: “Perpetual Environmentally Powered Sensor Networks” To appear, IPSN/SPOTS, April 2005

11 Visit the demo later today…
Experimentation with the Telos Platform: Telos Sensor Board Polastre and Dutta Event-driven sensorboard design Configurable Sensors with Interrupt Wakeup Microphone -- Sampling up to 200ksamples/second Variable gain, noise gating, low pass filter, configurable wakeup Speaker – Full dynamic range Hz >700mW output to 8 ohm speaker, Hz Accelerometer -- +/-5g, interrupts on light taps to heavy shaking Light sensor -- Photodiode with amplifier, configurable gain Low Voltage operation matches Telos design principles Lithium Ion battery recharged by USB Visit the demo later today…

12 Telos Designs and Availability
Designs and Layout provided to the open source community under BSD license Available at Many Telos clones now exist Many other Telos projects in the works Telos AC adapter, Telos fire alarm system… Tmote is the family of motes that use Telos as the reference design Commercialized by Moteiv Corporation

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