Transcript Presentation Slides - The University of Tennessee, Knoxville

The University of
Tennessee Knoxville
GROUP 7
MSP430 Presentation
Saturday, April 22, 2006
-Jason Bault
-Darren Giles
-Nathan Rowe
-Trevor Williams
MSP430
 Presentation Topics
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Project Objectives
Specifications
Board Design
Pressure Sensor
Temperature Sensor
Sensor Code Modifications
Results and Discussion
Conclusion
ECE 300 MSP430 Project
Objectives
 Use the MSP430 chip on a circuit board that uses
sensors to detect temperature and pressure
 Program the sensor logic into the
microprocessor
 Apply fundamental circuit knowledge to a
practical application of circuit design
 Learn how to solder elements to a circuit board
ECE 300 MSP430 Project
MSP430 Specifications
 Low Supply-Voltage Range, 1.8 V to 3.6 V
 Ultralow-Power Consumption:
 Active Mode: 280 uA at 1 MHz, 2.2 V
 Standby Mode: 1.1 uA
 Off Mode (RAM Retention): 0.1 uA
 16-Bit RISC Architecture,
125-ns Instruction Cycle Time
 12-Bit A/D Converter With Internal
Reference, Sample-and-Hold and Autoscan
Feature
 Integrated LCD Driver for Up to
160 Segments
 MSP430F449:
60KB+256B Flash Memory,
2KB RAM
ECE 300 MSP430 Project
Board Design
Resistors and Capacitors
were fairly easy to apply
with small dabs of solder
Topleft: LCD
Was simple to apply to
circuit board, used a little
solder on each pin through
holes
Center: MSP430 chip
Most difficult component
to install, required
preciseness and lots and
lots of patience
ECE 300 MSP430 Project
IESP-12 Pressure
Sensor
 Detects Force in units of
kgf (kilograms force)
 Max load of 4.0kgf
 Life: >= 100,000 cycles @
1.5kgf
 Operating Temp: +10 to
+40 Celsius
 Storage Temp: -40 to +70
Celsius
 Supply voltage: 3-6 VDC
 Current: 5 mA
 Max Current: 20 mA
 Max voltage: 30 VDC
ECE 300 MSP430 Project
AD590 Temperature
Sensor
 Low power requirements
 Voltage supply range of 4 to
30 VDC
 1.5 mW @ 5 V @ 25 Celsius
 High output impedance
from supply voltage drift
and ripple
 Small amount of error from
changing the power supply
 Electrically durable
 With stands forward voltage of
up to 44 V and a reverse of
20 V to resist damage
ECE 300 MSP430 Project
Sensor Code
Modifications
float CDEG,FDEG,XIN, Y,SIGK;
bool initializeFilter = false;
const float A = 0.613;
const float B = .19380;
float XIN7, XIN6, XIN5, XIN4,
XIN3, XIN2, XIN1;
------------------------------XIN = ADC12MEM6 * A * B;
------------------------------if(initializeFilter == false){
XIN7 = XIN;
XIN6 = XIN;
XIN5 = XIN;
XIN4 = XIN;
XIN3 = XIN;
XIN2 = XIN;
XIN1 = XIN;
 Modified sensor read-in
code for pressure sensor
 Used more accurate scaling
coefficient according to
our design
 Added a filter
initializing variable to
the first filter sampling
instead of the forth.
 This allows the reading
to display more
accurately on the first
sample.
initializeFilter = true;
}
ECE 300 MSP430 Project
Results & Discussion
 Correctly displayed force
 Correctly displayed temperature
 Correctly displayed output within a reasonable
range
 Our group did not use a 741 operational
amplifier for the gain. Instead we replaced the
op amp and the 1K resistor with one 5 k
resistor to duplicate the gain of five.
ECE 300 MSP430 Project
Problems
 Soldering Issues
- Trouble with pins holding
 Programming Issues
- Application wouldn’t accept arrays for a
more robust filter program
 Display Issues
- Missing segments at random
- Dim display at random
· Believed to be issues with the microprocessor
ECE 300 MSP430 Project
From Group 7