1. D.H.S. Digijock Home Security ECE477 – Team 7: Linda Stefanutti Zach Smith Stuart Pulliam Will Granger

2. Summary: ◦ PCB layout:  Overall considerations  Microcontroller  Power Supply 2Digijock Home Security

3. Overall considerations ◦ Area divisions:  Analog, digital, power, XBee ◦ Source of EMI  Power circuitry, speaker, XBee ◦ Sensitive devices  Microphone ◦ Width traces:  Ground/power: 40-60mils  Other signals : 10-12mils 3Digijock Home Security

4. Smoke detector XBee 7 CA5ICM 2N3704 Motion Sens LCD LED PCB Areas DIGITAL ANALOG POWER thermometer microphone Speaker 4Digijock Home Security

5. MOTION SENSOR SPEAKER MICROPHONE 5Digijock Home Security

6. Microcontroller ◦ Central position ◦ Decoupling capacitors ◦ Oscillator  close to the microcontroller  copper cover  RC filter ◦ Pin usage 6Digijock Home Security

7. 7 Microcontroller

8. Power system Backup battery addition ◦ Idle state: ~8 hours ◦ Alarm state: ~4 hours ◦ Analog and digital signals Voltage translator ◦ From 9 to 5 volt (speaker, thermometer, microphone, LCD, and motion sensor) ◦ From 5 to 3.3 volt (XBee) ◦ Bulk capacitors 8Digijock Home Security

9. Power system schematic 9Digijock Home Security

10. Questions 10Digijock Home Security