Phanindra

Phanindra/Comments.txt

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+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?