=====Dragonfruit Team Meeting - April 10th, 2017=====
Attended: Kevin, Gordon, Tyler, Kaeo

==== Updates ====  
  * Waiting on roof key to test board with adafruit charging chip
  * **New Theory**
    * We figured the problem was in the charging chip because the board worked perfectly find in the dark
      * we tied the stopped transmission to a fluctuation in solar voltage
    * Previously we cut the trace of the solar irradiance sensor to the sensor board adc 
      * we then attached a thin wire to fix that 
      * we think maybe the increased current in response to a irradiance increase might short the ADC
    * Fixed this by using another sensor board
  * Need to check polarization of capacitors
  * Talked to Allie about writing coding for our debug lights
  * Board 3
    * Diode 1 - 0V
    * Diode 2 - -1.724V 
    * Diode 3 - -1.704V
    * XBee voltage - 3.320V
    * MCU Voltage - 5.04V
  * Board 5
    * Diode 1 - 0
    * Diode 2 - 1.79
    * Diode 3 - 1.94
    * XBee Voltage - 0V
    * MCU Voltage - 5.04
  * **Board 6 doesn't work because of faulty 3.3 Vreg**
    * XBee Vreg doesn't output any voltage
==== Problems ==== 
  * Late to get the key to roof

==== Tasks ====    
  * Perform more tests of board under solar irradiance
    * in direct sunlight, see if board stops transmitting
  * Debug populated board 5
    * Some parts need to be swapped out
    * Continuity test of board 5
  * Create another spot on csv file for measuring voltage at XBee pin 
    * Will be used to look for ghost voltage
    * Nathan said we might not be able to do it : Correction we might be able to use it
    * Debug LED flag : turn on led and keep it on after Ghost voltage is perceived 
    * ADC6 might be able be a input chart
  * **Transmission Tests**
    * test adafruit charging chip indoors and outdoors
      * make sure output is good
      * LED behavior
      * behavior with irradiance
    * test our charging chip
      * behavior with irradiance 
      * LED behavior
      * Hopefully simply changing the charging chip will fix the problem
  * Look into power switching of charging chip
    * Tryston said that between 4.3 - 4.5V the board would be powered by the battery instead of the solar panel
  * Populate a new board as soon as new parts come in
  * Populate a board with charging chip
  * Charging chip debug LED tests
    * 1 - 5bit number to voltage tests
      * this is used to make sure that the charging chip follows tryston's charging chip behaviors
      * to be completed for adafruit charging chip and dragon fruit charging chip
      * 5bits = 31 in decimal
      * 0 = 3V
      * 9 = 3.9V
      * 13 = 4.3V
      * 20 = 5V
    * 2 - Use 3 debug LEDs to visually indicate when switching between solar panel and battery
      * LED 1 : Vload = Solar Panel 
      * LED 2 : 4.3 < Vload < 4.5   (around the voltage that Vload switches from Panel to Battery power)
      * LED 3 : Vload = battery mV
      * If all are off, then the load voltage is between 4.3V and battery voltage
      * Need to connect Vload to MCU
    * 3 - Use LEDs to flag Ghost voltage, low XBee voltage, and dropped transmission
      * LED 1 : Ghost voltage is 4V (this is much too high for XBee power)
      * LED 2 : XBee voltage at less than 2.7V (full range is 2.7 - 3.6V)
      * LED 3 : flag for transmission (we do not know how to do it yet)
      * Need to connect XBee power to MCU