Abhijit Kshirsagar
2 years ago
1 changed files with 38 additions and 0 deletions
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Name |
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1. Question text: |
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CO sensor |
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2. Design summary: |
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Very well written. Low Battery detection / alert is especially well done |
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3. Block diagram |
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Where is the block diagram? |
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you have given the entire electrical circuit diagram here. |
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Only some logical / hierarchical block diagram was needed here. |
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4. Power supply design |
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There are two major probems with your design. |
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a. The 9V battery you have chosen is not exactly good for long life. Look at other products that need long life batteries - |
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all use some kind of non-rechargeable lithium cells. |
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b. You are using a linear regulator which has expremely poor efficiency - you're going from 9V to 5V! |
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Should have used a 6V battery and LDO. |
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Microcontroller - pick one with low power consumption and/or sleep modes like the MSP430 or AtTiny. |
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5. Industrial Design: |
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Summary is fine - should have included sketches of the final unit. Where should the LED be? Where are the mountings for |
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buzzer / speaker? |
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6. KICAD Design |
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Schematic: |
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No major issues seen |
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PCB: |
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Layout could be a little better - you have many traces intersecting / overlapping. |
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Especially look at the sensor heater supply - those traces could be thicker. |
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What is the current needed there? |
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7. Pricing / BOM / Assembly |
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Some BOM optimisation could have been done - mostly all ok |
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Price for 2 prototypes not mentiones? |
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