EE442-FinalExam/Phanindra/Comments.txt

39 lines
1.3 KiB
Plaintext

Name
1. Question text:
CO sensor
2. Design summary:
Very well written. Low Battery detection / alert is especially well done
3. Block diagram
Where is the block diagram?
you have given the entire electrical circuit diagram here.
Only some logical / hierarchical block diagram was needed here.
4. Power supply design
There are two major probems with your design.
a. The 9V battery you have chosen is not exactly good for long life. Look at other products that need long life batteries -
all use some kind of non-rechargeable lithium cells.
b. You are using a linear regulator which has expremely poor efficiency - you're going from 9V to 5V!
Should have used a 6V battery and LDO.
Microcontroller - pick one with low power consumption and/or sleep modes like the MSP430 or AtTiny.
5. Industrial Design:
Summary is fine - should have included sketches of the final unit. Where should the LED be? Where are the mountings for
buzzer / speaker?
6. KICAD Design
Schematic:
No major issues seen
PCB:
Layout could be a little better - you have many traces intersecting / overlapping.
Especially look at the sensor heater supply - those traces could be thicker.
What is the current needed there?
7. Pricing / BOM / Assembly
Some BOM optimisation could have been done - mostly all ok
Price for 2 prototypes not mentiones?