TODO.md

PCB TODO

1. Determine USB-C connector, get 3d model and footprint
2. Create a footprint and 3D model for the SPEC sensors
3. Add LED connector
4. Determine supporting infrastructure for other SPEC sensors
5. Add SPEC sensors to schematic with infrastructure
6. Find alarm and add to design
7. Add power switch
8. Add status LEDs
9. Finish sensor biasing
10. Determine how we want to measure and indicate battery charge state
11. Determine which LEDs we want, add footprints
12. Determine where to power the Arduino from
13. Determine battery footprint (same as switch pad?)
14. Find female connectors for Arduino
15. Source Transistors
16. Change Power status LEDs to small SMT
17. Add mounting holes (to ground)
18. Change LED connector from vertical JST (too high) to ?(solder pads)
19. Adjust LED placements for both status and power
20. Place buzzer and LED connector
21. Route traces
22. Adjust Via size for power traces?
23. Check guidelines on IC datasheet (especially for trace separation)
24. Current sense resistor
25. Determine whether unused pins should be high or low
26. Add stitching vias
27. Adjust silkscreen labels
28. Add filled zones
29. Generate BOM, order components
30. Generate Gerber files, order boards

REV 2

1. Space LEDs further
2. Add standoffs for SPEC sensors (non-standard spacing)
3. Order Arduino and sensor standoffs
4. Verify schematic
5. Update board layout with new schematic
6. Update BOM
7. Order new parts
8. Battery spot-welding
9. Update schematic and layout with thermistor (on Analog Input)
10. Give mechanicals updated .step file
11. Ensure buzzer is on PWM pin (9)
12. Separate sensor grounds from others (Separated LEDs and Buzzer instead)
13. Add solder/test points for Arduino supply voltage
14. Test Power System
15. Add buzzer resistor