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weatherbox:guava:week_5_-_february_13_2017 [2017/02/14 02:10] dkvilla |
weatherbox:guava:week_5_-_february_13_2017 [2021/09/19 21:59] (current) |
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| * Looking into different types of sensors to include to Guava | * Looking into different types of sensors to include to Guava | ||
| * Going through our previous BOM, found that the pressure sensor (BMP180) has been | * 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 | ||
| ==== Parts Ordering ==== | ==== Parts Ordering ==== | ||
| + | * Created BOM and Parts list spreadsheet - started adding the major components | ||
| + | * [[https://docs.google.com/spreadsheets/d/1EouViGZ5lS5UOof1N6PJVX-Rg2dfYi-Wc7bsWNOyhRg/edit#gid=0|Parts List Spreadsheet]] | ||
| * Microprocessor - ATmega1284P | * Microprocessor - ATmega1284P | ||
| * [[http://www.digikey.com/product-detail/en/microchip-technology/ATMEGA1284P-AUR/ATMEGA1284P-AURCT-ND/3440906|Digikey]] | * [[http://www.digikey.com/product-detail/en/microchip-technology/ATMEGA1284P-AUR/ATMEGA1284P-AURCT-ND/3440906|Digikey]] | ||
| * [[http://www.atmel.com/devices/atmega1284p.aspx|Atmel Website]] | * [[http://www.atmel.com/devices/atmega1284p.aspx|Atmel Website]] | ||
| - | * Pressure Sensor - BMP 280 | + | * Pressure Sensor - BME 280 |
| * Previous model (BMP 180) discontinued by vendor Adafruit | * Previous model (BMP 180) discontinued by vendor Adafruit | ||
| - | * | + | |
| ==== Issues ===== | ==== Issues ===== | ||
| + | * 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 | ||
| ===== Reminders ===== | ===== Reminders ===== | ||
| + | * PDR is March 4th | ||
| + | * Do the passives on the parts order next week | ||
| [[weatherbox:Guava:meeting_minutes|Back to Guava's Meeting Minutes]] | [[weatherbox:Guava:meeting_minutes|Back to Guava's Meeting Minutes]] | ||