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D.H.S. Digijock Home Security

D.H.S. Digijock Home Security. ECE477 – Team 7: Linda Stefanutti Zach Smith Stuart Pulliam Will Granger. Summary:. PCB layout: Overall considerations Microcontroller Power Supply. Overall considerations. Area divisions: Analog, digital, power, XBee Source of EMI

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D.H.S. Digijock Home Security

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  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 Digijock 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 Digijock Home Security

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

  5. SPEAKER MICROPHONE MOTION SENSOR Digijock Home Security

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

  7. Microcontroller Digijock Home Security

  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 Digijock Home Security

  9. Power system schematic Digijock Home Security

  10. Questions Digijock Home Security

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