Guava - Week of February 13, 2017

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