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Author SHA1 Message Date
Abhijit Kshirsagar 1218f1d267 Phanindra 2022-04-28 10:29:59 +05:30
Abhijit Kshirsagar 4d3a59d82e Swakath 2022-04-27 21:56:21 +05:30
Abhijit Kshirsagar 54be124863 iSwakath 2022-04-27 21:13:00 +05:30
Abhijit Kshirsagar 4f10a9c509 Shivam 2022-04-27 21:10:24 +05:30
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)
Explain how you approach this design problem.
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.
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.)
* 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)
Explain how you approach this design problem.
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.
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.)
* 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.)
* 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.
* Explain in a few words what the enclosure is made of.

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Complete your entire design in Kicad, including:
* Circuit / schematic design:
* 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)
* Assign appropriate footprints to each component
* Make sure to run the Electrical Rule Checker before moving to the layout.
* PCB Layout design
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:
* Reference designation * Part number * Value / Ratings

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6. KICAD Design 6. KICAD Design
Schematic: Schematic:
Looks good
PCB: PCB:
No PCB Found. I've deducted some points for that but other responses are all ok.
7. Pricing / Assembly 7. Pricing / BOM / Assembly
Why do you need 400V transistors?
Where are remaining components in the BOM + pricing? Connectors, pcb, etc...?

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Swakath/Comments.txt Normal file
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Name: Swakath
1. Question text:
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.
2. Design summary:
Overall approach is fine.
Good work finding th module that has a 4-20mA output directly
3. Block diagram
Why is there a common supply for both the sensor module and the receiver module?
They might be physically very far apart!
4. Power supply design
The brick module may end up being underpowered for what you need.
Also, why design a rectifier filter and then use the module?
Power in a current-driven system is indeed tricky - you need to factor in the worst case
voltage drop and times the current is power.
5. Industrial Design:
6. KICAD Design
Schematic:
All good - good use of decoupling caps.
No Power on LED?
How exactly is the fault opamp working?
Also the OpAmp outputs are +/-12V. If you're connecting this to the uC you need to scale down to 5V or 3v3.
PCB:
No Mounting holes?
Good use of pours
7. Pricing / BOM / Assembly
The question asked for 2 prototypes - meaning two systems with about 20 sensor modules each.
But I guess this interpretation is fine too.