The University of Tennessee Knoxville GROUP 7

1. The University of Tennessee KnoxvilleGROUP 7 MSP430 Presentation Saturday, April 22, 2006 Jason Bault Darren Giles Nathan Rowe Trevor Williams

2. MSP430 • Presentation Topics • Project Objectives • Specifications • Board Design • Pressure Sensor • Temperature Sensor • Sensor Code Modifications • Results and Discussion • Conclusion

3. 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

4. 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

5. 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 chipMost difficult component to install, required preciseness and lots and lots of patience

6. 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

7. 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

8. 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. 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; initializeFilter = true; } Sensor Code Modifications

9. 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. Results & Discussion

10. 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

11. Thank You ! From Group 7