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Author | SHA1 | Date |
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Abhijit Kshirsagar | 1218f1d267 | 2 years ago |
Abhijit Kshirsagar | 4d3a59d82e | 2 years ago |
Abhijit Kshirsagar | 54be124863 | 2 years ago |
Abhijit Kshirsagar | 4f10a9c509 | 2 years ago |
46 changed files with 45 additions and 41 deletions
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Design Summary (add text in the box below or upload a PDF) |
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Explain how you approach this design problem. |
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Include your assumptions, trade-offs, with any and all design choices you make. |
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Upload the block diagram of the system you have designed as a single PDF. |
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Hand drawn diagram is acceptable - just make sure it is neat and clearly labelled. Mark all interfaces. Make sure to include suitable power supply/supplies. |
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Power Supply Summary (add text in the box below or upload a PDF. Handwritten+scanned is acceptable as long as it is neat and legible.) |
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* Explain your choice of your power supply. * Explain how your power supply works. Include circuit diagrams, waveforms and graphs as needed. |
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Design Summary (add text in the box below or upload a PDF) |
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Explain how you approach this design problem. |
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Include your assumptions, trade-offs, with any and all design choices you make. |
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Upload the block diagram of the system you have designed as a single PDF. |
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Hand drawn diagram is acceptable - just make sure it is neat and clearly labelled. Mark all interfaces. Make sure to include suitable power supply/supplies. |
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Power Supply Summary (add text in the box below or upload a PDF. Handwritten+scanned is acceptable as long as it is neat and legible.) |
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* Explain your choice of your power supply. * Explain how your power supply works. Include circuit diagrams, waveforms and graphs as needed. |
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Industrial Design Summary (add text in the box below or upload a PDF. Handwritten+scanned is acceptable as long as it is neat and legible.) |
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* Show (with labelled and dimensioned sketches) how your product will look (in the final form) as delivered to the end user. Include the enclosure, mounting etc as necessary. |
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* Explain in a few words what the enclosure is made of. |
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Complete your entire design in Kicad, including: |
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* Circuit / schematic design: |
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* Make sure to assign the appropriate values / ratings for each component. When you select components make sure they exist on a commercial electronic platform (e.g. some are listed here: https://gitea.iitdh.ac.in/PEG/PEG-Wiki/wiki/PurchasingComponents) |
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* Assign appropriate footprints to each component |
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* Make sure to run the Electrical Rule Checker before moving to the layout. |
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* PCB Layout design |
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When you are done, export the design as a SINGLE ZIP FILE (File > Archive) and then upload the zip file here. |
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Upload the Bill of materials (BOM) spreadsheet as a single XLS file. The spreadsheet should contain the following columns, at a minimum: |
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* Reference designation * Part number * Value / Ratings |
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Name: Swakath |
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1. Question text: |
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Design a system using this Honeywell ammonia sensor (https://drive.google.com/file/d/164WvPD7GauvseOfH-K3v8iZ4YYmQFkq-/view?usp=sharing ) to detect when ammonia concentration in ambient atmosphere exceeds 100 ppm an alert an operator in a control room about 100m away. This device will be mounted in various sections of an industrial processing plant. The complete plant will need a fairly large number (~20) of sensors so unit costs needs to be kept under control. Also, once mounted it will be very difficult to remove/service/repair the sensing devices. |
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2. Design summary: |
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Overall approach is fine. |
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Good work finding th module that has a 4-20mA output directly |
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3. Block diagram |
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Why is there a common supply for both the sensor module and the receiver module? |
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They might be physically very far apart! |
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4. Power supply design |
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The brick module may end up being underpowered for what you need. |
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Also, why design a rectifier filter and then use the module? |
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Power in a current-driven system is indeed tricky - you need to factor in the worst case |
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voltage drop and times the current is power. |
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5. Industrial Design: |
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6. KICAD Design |
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Schematic: |
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All good - good use of decoupling caps. |
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No Power on LED? |
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How exactly is the fault opamp working? |
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Also the OpAmp outputs are +/-12V. If you're connecting this to the uC you need to scale down to 5V or 3v3. |
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PCB: |
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No Mounting holes? |
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Good use of pours |
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7. Pricing / BOM / Assembly |
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The question asked for 2 prototypes - meaning two systems with about 20 sensor modules each. |
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But I guess this interpretation is fine too. |
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