# 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