CS61C - Lecture 23

1
Chipcon Radio CC1000 andDOT3 Motes
2002-11-13 Jaein Jeong
2
Overview

• Motivation
• To build a mote with better radio communication
  capability
• Chipcon Radio CC1000
• Low Power Consumption
• 7.4/9.6 mA for receive mode
• 5.3/8.6 mA (-20dBm) for transmit mode14.8/25.4
  mA (5dBm)
• Reduced interference thanks to FM modulation
• DOT3 motes
• Basically essential parts of MICA with new radio
• ATMega 128 processor and 6 ADC channels
• CC1000 Radio

ATMega 128 processor
DOT3 mote Front side
CC1000 Radio chip
Back side
3
Chipcon CC1000

• Supports different bands of frequency
• 315, 433, 868 and 915 MHz bands are supported
• Can choose only one range because RF circuit
  depends on the frequency range
• We tested for 433MHz and 915MHz
• Allows to select a frequency within a range
• Within a range (e.g. 915MHz), we can choose a
  specific frequency out of 40 frequencies
• Good for reducing any interferences from other
  devices
• Supports two tones. One for transmit, the other
  for receive.

4
Status

• It works!
• The range was around 100ft indoors
• 373 Cory to the elevator

Coverage
Sender
5
Status

• Difficulty
• Initial production targeted for 433MHz had a
  wrong inductor (which is for 915MHz).
• After replacing the inductor, it worked.

Inductor L8 was in wrong value (should be 33nh,
but in 4.7nh)
6
Demo

• Demo 1
• Two 900MHz DOT3 motes
• One mote sends a message and the other blinks
  upon receiving the message
• Demo 2
• One 433MHz DOT3 and one 433MHz MICA2
• Sends a command and receive reply through MICA2
  which works as a base station. DOT3 operates
  receives command and gather ADC sensing data.