Dragonfruit Team Meeting - February 27th, 2017
Attended: Kevin, Gordon, Tyler
Updates
- Tested board 3 (previously deployed) transmission with irradiance
- This board would end transmission whenever
- By suggestion of Garrett we removed the V-switch from the board and connected the load voltage from an adafruit charging chip to the board
- by doing this we are able to bypass our own charging chip and provide power using the adafruit charging chip
- need to simulate sunlight fluctuation using the lamp
Problems
- Parts on board 5 were desoldered off of the decommissioned board 4
- We suspect that some of these parts were damaged after desoldering
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:
Created by tyamauchi on 2017/02/28 01:14.