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# System prepended metadata

title: 2020-01-14 Meeting OroraTech

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# 2020-01-14 Meeting OroraTech

## Balloon:
### Requirements:
* Balloon:
    * Weight: 4000g
* Gondola:
    * Weight: 2000g
* Batteries:

### Integration, Structure:
* Camera will be mounted on the "backside" of the backplane
* GlobalStar module + antenna will be mounted outside of the styrofoam box and only a UART connection + power supply will be routed to the LoPy board.

Important: Don't use USART, use either UART or UART with flow control (UART + RTS and CTS)

## Payloads:

* Camera:
    * Energy requirements:
        * 10W peak at 5V Bus maximum rating
        * 2.5W at 5V Bus average rating
        * 2W + 2.4W at VBat maximum rating
        * 0.6 (heating) + 2.5W (2W output + 0.5W conversion losses at boost converter) at VBat estimated average rating
    * Weight:
        * 500g
    * Data:
        * USART connection
* Globalstar:
    * Energy:
        * 1W at 5V maximum rating
        * 200mW at 5V average rating
    * Data:
        * UART connection
## Backplane Review:
* check if I2C and CAN can function on the same port (change if necessary)
* GND on P1 as optocoupler LED ground
* think if resistors on SPI can be removed or have to be increased
* CAN driver VCC label missing (why no error?)
* check lokal (global) labels (naming rules?)
* use quarz (8MHz ?) on MSP for CAN integrity
* Connect CAN-clk to MSP pwm-pin
* think about how often MSP gets pinged via CAN
* use same converter (6A) on 5V and 3V3 power line. Adjust frequency divider and coil accordingly
* use same switch on 3V3, 5V and VBat (FPF switch)
* Solder bridges for not connected pins towards ground (don't build ground loops, don't have floating lines)
* conect pin 13 on P4 to something so it is not floating

## To Be Done - Orora

* Test average power consumption
    * Take estimations from the meeting, final measurements will take still some time
* Estimation of dimensions
    * Dominik got the task, will provide 3D models
* Mass estimation:
    * Current prototype: 500g without full structure and PL adapter board
    * 500g is likely not possible, we need to check how much more exactly we need
* Discuss with Dominik: Backplane as main structure?
    * Answer by Dominik: Should work, lets try it