Table of Contents
Dragonfruit Team Meeting - April 3rd, 2017
Updates
Problems
Tasks
Authors
Dragonfruit Team Meeting - April 3rd, 2017
Attended: Kevin, Gordon, Tyler, Kaeo
Updates
Finished Eagle Design
Waiting on roof key to test board with adafruit charging chip
Test of board 5
Board 5 charging chip behaves exactly the same as board 3 charging chip and 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
Diodes on the board might need to be flipped
Check polarization of capacitors
Talked to Allie about writing coding for our debug lights
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
Authors
Contributing authors:
tyamauchi
Created by
tyamauchi
on 2017/04/04 03:15.