# Dependencies

- Form factor from mechanical engineering
    
    - --> where to place antenna connectors?
    - --> where to place pdb?
    - --> where to place batteries? What form factor for batteries?
- Protocol decision to know what pinout we need.

# Schematics

Estimate: 16 days

1. - [ ] Add main components
    
    1. - [ ] SOM connector
    2. - [ ] LTE-Chip
    3. - [ ] All connectors (generic with #pins correct)
    4. - [ ] Additional pins that could be useful, all in one connector. 1
    5. - [ ] All power Ics, which ones? What are requirements? 2
2. - [ ] Add supportive passive components for Ics according to their datasheets 4
3. - [ ] Think about redundancy and fuses. Protect from different faults. 2
4. - [ ] Have a working camera solution. What cameras are compatible with MIPI and Qualcomm?What connector do we want for them? 4 --> inigo needs to find a solution
5. - [ ] Schematics review. Double check with all datasheets that things are in order. 3
    
    1. - [ ] Go through every net and define purpose. Is it only connected to that net?

# PCB Design

Estimate: 15 days

1. - [ ] Define form factor with Romain. Think about manufacturability from beginning. 4
    
    1. - [ ] download 3d model of SOM and connector.
    2. - [ ] Define plate with +- 7mm or so for pcb and components.
    3. - [ ] Use as structural element?
    4. - [ ] Where will PDB be?
        
        1. - [ ] How are the 2 boards connected?
    5. - [ ] Should we have a third board? --> sensor board, additional imus and gps
    6. - [ ] Where the batteries?
2. - [ ] Define min track width, stackup, etc.
3. - [ ] Define main areas (power switching far away from analog signals) and place main components. 1
4. - [ ] What can be underneath the SOM?
5. - [ ] Place components and use as small components as possible. 3
    
    1. - [ ] Use both sides of the board to make it small.
6. - [ ] Redo schematics review. 1
7. - [ ] Route high speed signals and antenna tracks 3
8. - [ ] Route other data tracks 2
9. - [ ] Add planes. 1
10. - [ ] Add stitching vias everywhere.
11. - [ ] Review design.

# Requirements

- [ ] UART to PX4 (with jst connector)

- [ ] Connector for GPS-module / pixhawk standard?Or Integrated GPS module? Or both

- [ ] Connector for UAVCAN

- [ ] For RB5s

- [ ] To Esc (with a solder bridge). If dshot escs can is routed onboard, else via escs

- [ ] Which one is terminating node?

- [ ] LTE-link (one 4g, one LTE-M)

- [ ] 2 Cameras per computer (or 4 through mipi splitter?)

- [ ] Power delivery network

- [x] Connection between Qualcomms (ethernet vs usb-c)

- [ ] Wifi and bluetooth.

- [ ] Can the antenna connector on the SOM be used?

- [ ] Document every decision and step

- [ ] GPIO to reset other qualcomm

- [ ] GPIO to reset FC

- [ ] Main switch to

# Preparation

Estimate: 7 days

1. - [ ] Understand Qualcomm platform 2 days
    
    1. - [ ] How is power routed exactly?
    2. - [ ] How are camera signals routed?
2. - [ ] Decide which ports are going to be used for what peripherals 0.5
3. - [ ] Choose LTE-chip 0.5
    
    1. - [ ] --> 4G chip (redundant)
        
        1. - [ ] How can we control drone through 4G?
4. - [ ] Choose GPS solution / chip or external 1
    
    1. - [ ] Are there any high precision modules available on the market?
    2. - [ ] Can we easily implement them into our design and manufacturing?
5. - [ ] Decide on solution for inter-RB5 communication 1
    
    1. - [ ] PCIe ethernet & usb-c receptacle? We can test both simultaneously.
    2. - [ ] Test with corals: usb-c to usb-a: always feasible?
    3. - [ ] Implement both? --> not for redundancy reasons.
    4. - [ ] --> usb-c!
6. - [ ] Define all pins that could be needed and provide them through a connector 1
    
    1. - [ ] All uart ports, all i2c, all SPI. Nets to observe for debugging.Power rails to observe, additional gpios
7. - [ ] Decide what power rails are needed, how many voltages, redundancy? 1

# Questions to answer

- [ ] Have we tested everything we could in the prototype stage? With breadboards and jumper cables, etc?

- [ ] What sensors do we want?

- [ ] A few temperature sensors on I2C bus

- [ ] Additional IMU's? away from ESCs

  

- [ ] Redundancy: split into 2 boards? Electrical isolation?

- [ ] Does the SOM have wifi antenna and bluetooth antenna?if not, what antenna do we use? Pcb antenna integrated into our design? Or pluggable antenna?

- [ ] Do we want flash storage? To collect datasets. Or is onboard storage enough

  

# Review, Order & Shipping

Estimate: 2 + 15

1. - [ ] Redo reviews (schematics and pcb) with other person.
2. - [ ] Order
3. - [ ] Shipping

# Testing & Debugging

Estimate: 7 days (can be a lot longer if board doesn't work)

1. - [ ] Define tests
2. - [ ] Execute Tests & document results