Main/OneNote/OSD/Admin and General/Planning Electronics March-Mai.md

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

• 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