1. ECE 300 – Spring 2007 Christopher Boyd Anusha Gattupalli Timothy Poore

2. Project Assignment  Groups were assigned in class.  Leaders for each group were specified.  Dr. Green then described how to go about doing the project.  He specified what parts we would need and where we could get them.  He also gave us equipment to use like the microscope and soldering iron.

3. Getting the Parts  We ordered 3 MSP430F449PZ chips from Texas Instruments. (free samples)  We then purchased a kit for the project at the Ferris Hall Parts Store for $15.  After we started working on the project, we decided upon what types of sensors we wanted and ordered free samples from Analog Devices.

4. Project Goals  Over the course of the project, we were expected to learn how to work as a team.  Learn how to solder components like the capacitors and the chip onto the board.  Design a circuit to make the sensor work.  Program the chip to analyze the voltage from the sensor and display the appropriate output on the LCD.

5. Soldering  Capacitors and resistors were mounted first, to give us experience with soldering.  We paid close attention to the direction that the polarized capacitors were facing.  Next we soldered the chip on the board.  It would have been more difficult to solder the chip on after the other parts were placed on the board.

6. Soldering the Chip  The chip has 25 pins on each side.  There are four ½ inch sides.  We had to apply pressure to each pin as we soldered it, in order to make sure a good connection was made.  On one side, the pins needed to be bent slightly in order to make a connection with the trace on the board.

7. Soldering (continued)  After we soldered the chip, we went through and made sure that each of the 100 pins were properly connected.  Then we soldered all the other components like the JTAG connector and the LCD.  Finally, we mounted the voltage jacks and soldered the wires to the appropriate spots on the board.

8. Programming the Chip  First we tried to load the “Hello” program to the chip.  However, there were problems.  Checked all the pins of the chip (again) to make sure they were soldered on.  After that, it still didn’t work. Turns out the computer had a faulty parallel port.

9. Building the Sensor Circuits  Dr. Green had sent out an email with the schematic for AD590 sensor circuit. We built it exactly like the schematic.  After tweaking the resistor pots appropriately, it worked with Dr. Green’s sensor program.  Next was the AD22103, which was simpler to set up (provided you don’t have it reversed.)

10. AD22103 Program  Using the equation that we were given: V out =(V s *3.3V)*[.25V+.028V/°C*T a ] We plugged in V s which was 2.869V coming from the sensor board, and then solved for T a.  This gives us: T=41.0795*V o -8.9286 (°C)  However, V o then had to be multiplied by a scaling factor of.61.

11. AD22103 (continued)  In addition to the scaling factor for V o, the value was 100x what it should be, which was appropriate since this is needed for the LCD display.  However, this meant that any value added to or subtracted from the V o needed to be multiplied by 100.

12. AD22103 Chart

13. Any Questions?