Group Five MSP430 Project Katy Charlton Jeremy McNutt Ben Ealey Aaron Vallance April 14, 2007

Project Objectives □To build a functioning circuit board with a microprocessor by soldering different components to the board. □To construct a sensor board that will connect to the circuit board. □Write a computer program that will display the temperature sensor reading onto the lcd display of the circuit board.

MSP430 Chip □Voltage supply of 1.8 to 3.6 V □16-bit design □12-bit A/D converter □5 power saving modes □Serial onboard programming □On-chip comparator □60 kB flash memory, 2048 B RAM □Low power to active mode in less than 6 microseconds

Completed Circuit Board

AD590 Temperature Sensor Sensor Output: 1μA/˚K Supply voltage: 4 to 30 V Temperature range: -55 to 150 ˚C 2 terminals: voltage in, current out Calibration required

AD22103 Temperature Sensor Supply voltage: 2.7 to 3.6 V Temperature range: ˚C Temperature coefficient: 28mV/ ˚C Transfer function: V 0 =(V s /3.3V)*[0.25V+(28mV/˚C)*T A ] On-chip signal conditioning – no need to calibrate

Computer Programming Program Modifications: □ Added 7 th order filter □ Conversions from Kelvin to Celsius and Fahrenheit □ Change input from sensor to Celsius from Kelvin with new sensor Filtering: □ 7th order filter allows the output to be a better representation of the current temperature because the past seven data points have been averaged □ This can also cause a delay when the sensor is first activated

Troubleshooting □Check all pin connections on the circuit board. □Make sure all components of the sensor board are wired and powered correctly. □Test operational amplifier and MSP430 against working standards.

Success!

Sensor Readings Why does the temperature increase quickly and decrease slowly upon placing and releasing a heat source?

Questions?