Attended: Kevin, Kyaw, Tyler

• Confirmed that our board transmits accurate sensor data
• Deployed Dragonfruit to the rooftop of Holmes Hall
• Successful deployment, but Dragonfruit stopped transmitting after about 48 hours
  • Last voltage seen was 6V to the circuit
  • 6V should be well within the voltage regulator max ratings
• Found interesting data from adafruit

“Now you can see what happens if you connect a 6V solar panel to a lipoly charger. As long as the current being drawn by the charger is less than the panel's short circuit current at that light condition, everything is peachy. The moment the light changes even a little, and the current the lipo charger wants is higher than the short circuit current, the charger becomes unstable: it will draw too much current, which will cause the voltage to collapse, which causes the charger to turn off, which reduces the current draw, which makes the panel voltage recover, which turns on the charger again, which then draws too much current, and the cycle repeats.”

- https://learn.adafruit.com/usb-dc-and-solar-lipoly-charger/using-the-charger?view=all#downloads

• Find the csv file to analyze Dragonfruit's deployment
• Code an arduino to monitor current drawn by charging chip
• Start soldering next week (Tyler)
  • Start with charging chip
• Investigate short circuit current of solar panel (Kyaw)

• Solder parts onto a new board
• Find the problems from the old board

Contributing authors:

Created by tyamauchi on 2017/09/20 22:18.