Attended: Tryston, Michael, Kaeo

• Fixing the Wiki
  • Adding Datasheets and Presentation pages to project details
  • Changing 4th generation → 5th generation
• Looking into different types of sensors to include to Guava
• Going through our previous BOM, found that the pressure sensor (BMP180) has been
• Started on PCB Schematic design
  • Schematic grid size is set to 50 mil. If space is needed, we can drop down to 10 mil or 5 mil only.
    • This will keep all our parts is uniform and in line when connecting
  • Use same grid size rules for board layout
• DL-ed newest version of EAGLE (8.0) - to be all on the same software; to avoid unnecessary problems

• Created BOM and Parts list spreadsheet - started adding the major components
• Parts List Spreadsheet
• Microprocessor - ATmega1284P
  • Digikey
  • Atmel Website
• Pressure Sensor - BME 280
  • Previous model (BMP 180) discontinued by vendor Adafruit

• Charging Circuit
  • Cranberry or Dragonfruit
  • Undecided - 470uF * 10 pieces to get the 4700uF
• Solar Panel
  • Single or Double
    • Barrel Jack Fittings are different
  • Decided single - Just need to find the fitting Barrel Jack Connector
• 3.3V or 5V?
  • Compatible Sensors - BME and the Pyranometer
  • Decided 3.3V
  • BME, Pyranometer, and ATmega are 3.3V compatible
    • BME - Takes 3-5V and steps down to 3V on the chip using its own regulator
    • Pyranometer - 'Should' take an input close to the output ~ 2.5V
    • ATmega - Operating Voltage is 0-5V - at 3.3V the operating freq is 0-10Mhz. We can use a 8Mhz clock like Cranberry

• PDR is March 4th
• Do the passives on the parts order next week

Back to Guava's Meeting Minutes

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Created by dkvilla on 2017/02/14 01:50.