Table of Contents
Dragonfruit Team Meeting - March 6th, 2017
Updates
Problems
Tasks
Authors
Dragonfruit Team Meeting - March 6th, 2017
Attended: Kevin, Gordon, (Tyler)
Updates
Finishing parts order for future boards
Verifying the major components of the schematic.
Added decoupling capacitor to charging chip
Added voltage divider to VBATT connection between charging chip and MCU. (Avoid direct voltage connection)
Started the board design of the PCB design.
Problems
Tasks
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
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
Use debug LEDs to set a flag if the board is not transmitting
What do we flag?
Make the XBee drop a packet using the light
match XBee power drop to switch between solar panel and battery power
Look into board behavior when light is on full blast
Populate a new board as soon as new parts come in
Take off vswitch and connect to the charging chip load
LEDs should act the same as the adafruit charging chip LEDs
Populate a board with charging chip
The VBATT connection is directly connected to the MCU
Incorporate a voltage divider to that connection.
Add decoupling capacitor to the vswitch connection (may or may not matter)
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:
kwong
Created by
kwong
on 2017/03/07 03:06.