Differences
This shows you the differences between two versions of the page.
| Next revision | Previous revision | ||
|
weatherbox:dragonfruit:meeting_minutes_september_17_2017 [2017/09/20 22:18] tyamauchi created |
weatherbox:dragonfruit:meeting_minutes_september_17_2017 [2021/09/19 21:59] (current) |
||
|---|---|---|---|
| Line 4: | Line 4: | ||
| ==== Updates ==== | ==== Updates ==== | ||
| * Confirmed that our board transmits accurate sensor data | * Confirmed that our board transmits accurate sensor data | ||
| - | * 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 | ||
| - | Update: 9/13 | + | "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." |
| - | * We've figured out the why the board is reading "odd" solar test voltage. | + | |
| - | * The output of the charging circuit is soldered to the VCC input of the board, which the solar test voltage is reading from | + | |
| - | * As far as the board is concerned, the solar test voltage should be reading half of the voltage from the battery (voltage divider connection) | + | |
| - | * We've emailed Dr. Garmire about the roof top access. Waiting for his reply. | + | |
| - | + | ||
| - | Update: 9/15 | + | |
| - | * Battery voltage reading from the solar test pin is actually correct | + | |
| - | * The value is multiplied by 2 in the code when transmitted to the gateway | + | |
| - | * Tested sensor data values: Humidity, Temp., Solar Irradiance, Pressure | + | |
| - | * Ready to for deployment test next week | + | |
| - | * We just need to find our solar panels | + | |
| - | ==== Tasks ==== | + | |
| - | * Have to test on roof to conclude about charging circuit (working properly or not) with or without the solar panel attached | + | |
| - | * Email Dr. Garmire and cc Dr. Kuh for roof top access once we're ready. | + | |
| - | * Make sure the sensors are transmitting correct data and battery is fully charged before testing at the roof top | + | |
| - | * Make sure we have the new parts for another board | + | |
| - | * Deploy the board without the solar panel to see if the board works. | + | |
| + | - https://learn.adafruit.com/usb-dc-and-solar-lipoly-charger/using-the-charger?view=all#downloads | ||
| + | |||
| + | ==== Tasks ==== | ||
| + | * 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) | ||
| ==== Goals ==== | ==== Goals ==== | ||
| * Solder parts onto a new board | * Solder parts onto a new board | ||
| * Find the problems from the old board | * Find the problems from the old board | ||