BTnode rev3

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The BTnode Rev3 ^[1] is a compact dual radio device used for fast proto-typing of sensor and ad-hoc networks. It makes use of the Atmel AVR microcontroller and is very simliar to the Crossbow Mica2 mote, differing in the amount of SRAM (256K) and the addition of the BluetoothTM radio ^[2].

Contents 1 Hardware Specifications 2 Applications 3 Power 4 Power Consumption 5 Software 6 Additional Information 7 Papers 8 References 9 Navigation

Hardware Specifications

Sensing:	Generic sensor board extensions
I/O:	External Interfaces UART, SPI, I2C? , GPIO, ADC, Clock, Timer 4 Colored Status LEDs Reset button Connectors Extension Connector J! Hirose Receptacle DF17-40DS Debug Connector J2 Molex 53261-1590
Radios:	802.15.4 Radio Chipcon CC1000 radio operating at 868 MHz Option between integrated monopole antenna (default) or an external wire and external co-axial connector (MMCX type). Class 2 BluetoothTM Radio Zeevo ZV4002 Bluetooth radio running HCI firmware. Supports the following features: Features: 0xff 0xff 0x05 0xf8 0x1b 0x18 0x00 0x80 <3-slot packets> <5-slot packets>
CPU:	Atmel ATmega 128L (8 MHz @ 8 MIPS), 4kByte EEPROM, 64kByte SRAM, 128kByte Flash System Clock, 32 kHz real time clock and 7.3728 MHz system clock In System Programming* through serial ISP programmer, JTAG or resident bootloader
Storage:	3x60 kByte low power SRAM.

Applications

BTnode Rev3 is mainly used as a research platform in mobile and ad-hoc connected networks (MANETs) and distributed sensor networks.. It is currently being used in two key projects:

• NCCR MICS
• Smart-Its

Power

The standard power supply for the BTnode Rev3 are two primary/rechargeable AA batteries in the range of 2-3V DC. The device also contains a boost converter with an input range of 0.5-3.3V DC and an alternate supply input via the VDC_IN pin in the range of 3.6-5.0V DC.

• Primary Supply Linear LTC3429, 600mA max., 0.5-4.4V to 3.3V.
• Alternate Supply LT1962, 300mA max. 3.6-5.0V to 3.3V.
• Secondary Supply IO Default OFF.
• Secondary Supply BT Max. dissipation 80 mA. Default ON.
• Secondary Supply CC Max. dissipation 30 mA. Default OFF.
• Battery Charge Indicator
• On/Off Switch for the primary power supply.
• Current Access Shunts to all subsystems for in-situ power profiling (AVR, BT, CC).

Power Consumption

	BTnode rev3 Bluetooth1	BTnode rev3 Low Power Radio1
Battery Supply	2 AA cells primary/rechargeable
Regulated Supply	Yes
Battery Capacity	2900 mAh
Minimum Vin	0.85 V
CPU sleep, Radio off	9.9 mW
CPU on, Radio off	39.6 mW
CPU on, Radio listen	92.4 mW	82.5 mW
CPU on, Radio RX/TX	105.6 mW	102.3 mW
CPU on, Bluetooth Inq	198 mW	---
CPU on, Radios both listening	135.3 mW
Max. Power	198 mW	102.3 mW

Table source: [1]

¹all values where measured on a live system running at 3.3V

Software

• BTnut System Software 1.8 available at both the BTnode Homepage and Sourceforge

Additional Information

For additional information on the BTnode, please see the following sites:

• BTnodes - A Distributed Environment for Prototyping Ad Hoc Networks
• BTnodes project page at Sourceforge

Papers

• BEUTEL Jan; KASTEN Oliver; MATTERN Friedemann; RÖMER Kay; SIEGEMUND Frank; THIELE Lothar; "Prototyping wireless sensor network applications with BTnodes", Lecture notes in computer science, Wireless sensor networks, Jan 2004, vol. 2920, pp. 323-338

References

1. ↑ http://www.btnode.ethz.ch/pub/uploads/Documentation/btnode_rev3.22-antenna5.jpg
2. ↑ http://www.btnode.ethz.ch/pub/uploads/Documentation/btnode_rev3.22-antenna5.jpg BTnode Rev3 with wire antenna

Navigation

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