The University of Tennessee Knoxville GROUP 7 MSP430 Presentation Saturday, April 22, Jason Bault -Darren Giles -Nathan Rowe -Trevor Williams

ECE 300 MSP430 Project MSP430  Presentation Topics  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  A at 1 MHz, 2.2 V  Standby Mode: 1.1  A  Off Mode (RAM Retention): 0.1  A  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, kgf  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  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  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; }

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

From Group 7