151 lines
4.7 KiB
Markdown
151 lines
4.7 KiB
Markdown
# Dependencies
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- Form factor from mechanical engineering
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- --> where to place antenna connectors?
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- --> where to place pdb?
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- --> where to place batteries? What form factor for batteries?
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- Protocol decision to know what pinout we need.
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# Schematics
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Estimate: 16 days
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1. - [ ] Add main components
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1. - [ ] SOM connector
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2. - [ ] LTE-Chip
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3. - [ ] All connectors (generic with #pins correct)
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4. - [ ] Additional pins that could be useful, all in one connector. 1
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5. - [ ] All power Ics, which ones? What are requirements? 2
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2. - [ ] Add supportive passive components for Ics according to their datasheets 4
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3. - [ ] Think about redundancy and fuses. Protect from different faults. 2
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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
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5. - [ ] Schematics review. Double check with all datasheets that things are in order. 3
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1. - [ ] Go through every net and define purpose. Is it only connected to that net?
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# PCB Design
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Estimate: 15 days
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1. - [ ] Define form factor with Romain. Think about manufacturability from beginning. 4
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1. - [ ] download 3d model of SOM and connector.
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2. - [ ] Define plate with +- 7mm or so for pcb and components.
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3. - [ ] Use as structural element?
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4. - [ ] Where will PDB be?
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1. - [ ] How are the 2 boards connected?
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5. - [ ] Should we have a third board? --> sensor board, additional imus and gps
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6. - [ ] Where the batteries?
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2. - [ ] Define min track width, stackup, etc.
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3. - [ ] Define main areas (power switching far away from analog signals) and place main components. 1
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4. - [ ] What can be underneath the SOM?
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5. - [ ] Place components and use as small components as possible. 3
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1. - [ ] Use both sides of the board to make it small.
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6. - [ ] Redo schematics review. 1
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7. - [ ] Route high speed signals and antenna tracks 3
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8. - [ ] Route other data tracks 2
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9. - [ ] Add planes. 1
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10. - [ ] Add stitching vias everywhere.
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11. - [ ] Review design.
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# Requirements
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- [ ] UART to PX4 (with jst connector)
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- [ ] Connector for GPS-module / pixhawk standard?Or Integrated GPS module? Or both
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- [ ] Connector for UAVCAN
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- [ ] For RB5s
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- [ ] To Esc (with a solder bridge). If dshot escs can is routed onboard, else via escs
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- [ ] Which one is terminating node?
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- [ ] LTE-link (one 4g, one LTE-M)
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- [ ] 2 Cameras per computer (or 4 through mipi splitter?)
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- [ ] Power delivery network
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- [x] Connection between Qualcomms (ethernet vs usb-c)
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- [ ] Wifi and bluetooth.
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- [ ] Can the antenna connector on the SOM be used?
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- [ ] Document every decision and step
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- [ ] GPIO to reset other qualcomm
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- [ ] GPIO to reset FC
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- [ ] Main switch to
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# Preparation
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Estimate: 7 days
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1. - [ ] Understand Qualcomm platform 2 days
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1. - [ ] How is power routed exactly?
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2. - [ ] How are camera signals routed?
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2. - [ ] Decide which ports are going to be used for what peripherals 0.5
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3. - [ ] Choose LTE-chip 0.5
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1. - [ ] --> 4G chip (redundant)
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1. - [ ] How can we control drone through 4G?
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4. - [ ] Choose GPS solution / chip or external 1
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1. - [ ] Are there any high precision modules available on the market?
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2. - [ ] Can we easily implement them into our design and manufacturing?
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5. - [ ] Decide on solution for inter-RB5 communication 1
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1. - [ ] PCIe ethernet & usb-c receptacle? We can test both simultaneously.
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2. - [ ] Test with corals: usb-c to usb-a: always feasible?
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3. - [ ] Implement both? --> not for redundancy reasons.
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4. - [ ] --> usb-c!
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6. - [ ] Define all pins that could be needed and provide them through a connector 1
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1. - [ ] All uart ports, all i2c, all SPI. Nets to observe for debugging.Power rails to observe, additional gpios
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7. - [ ] Decide what power rails are needed, how many voltages, redundancy? 1
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# Questions to answer
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- [ ] Have we tested everything we could in the prototype stage? With breadboards and jumper cables, etc?
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- [ ] What sensors do we want?
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- [ ] A few temperature sensors on I2C bus
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- [ ] Additional IMU's? away from ESCs
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- [ ] Redundancy: split into 2 boards? Electrical isolation?
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- [ ] 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?
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- [ ] Do we want flash storage? To collect datasets. Or is onboard storage enough
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# Review, Order & Shipping
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Estimate: 2 + 15
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1. - [ ] Redo reviews (schematics and pcb) with other person.
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2. - [ ] Order
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3. - [ ] Shipping
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# Testing & Debugging
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Estimate: 7 days (can be a lot longer if board doesn't work)
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1. - [ ] Define tests
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2. - [ ] Execute Tests & document results |