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Swap back to MicroSD schematic #40

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opened 2025-09-21 00:29:41 -04:00 by Adog64 · 0 comments
Adog64 commented 2025-09-21 00:29:41 -04:00
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After some review of past decisions, we have decided to re-visit the MicroSD card slot for data storage. Although a soldered on flash chip has some advantages over a MicroSD card, namely less moving parts, a smaller footprint, and lower cost, the MicroSD card wins overall, especially from the point of view of trying to get a working prototype as soon as possible.

MicroSD Flash
Physical Size 14.5mm \times 14.5mm 10.3mm \times 10.3mm
Memory Size Up to 32GB ~32MB
Dev Work Minimal / Built into MCU Full hardware driver development
Cost $1.63 Slot + $7.00 Card = $8.63 $2.87

Potentially, we could offer a version without the MicroSD card, so customers would save money if they already have one. There must be an option with a pre-formatted SD card included.

To solidify this decision, we will re-add the SD card schematic, and attempt a board layout. If we cannot create a board layout that meets all design requirements (#1), then we will not go forward with the decision to use a MicroSD card.

After some review of past decisions, we have decided to re-visit the MicroSD card slot for data storage. Although a soldered on flash chip has some advantages over a MicroSD card, namely less moving parts, a smaller footprint, and lower cost, the MicroSD card wins overall, especially from the point of view of trying to get a working prototype as soon as possible. | | MicroSD | Flash | |-|-|-| | Physical Size | 14.5mm $\times$ 14.5mm | 10.3mm $\times$ 10.3mm | | Memory Size | Up to 32GB | ~32MB | | Dev Work | Minimal / Built into MCU | Full hardware driver development | | Cost | $1.63 Slot + $7.00 Card = $8.63 | $2.87 | Potentially, we could offer a version without the MicroSD card, so customers would save money if they already have one. There *must* be an option with a pre-formatted SD card included. To solidify this decision, we will re-add the SD card schematic, and attempt a board layout. If we cannot create a board layout that meets all design requirements (#1), then we will not go forward with the decision to use a MicroSD card.
Adog64 added this to the Electrical Design (ECAD) project 2025-09-21 00:29:41 -04:00
Adog64 moved this to In Progress in Electrical Design (ECAD) on 2025-09-21 00:29:49 -04:00
Adog64 added reference ECAD-baseline-microsd-schematic 2025-09-21 00:31:44 -04:00
Adog64 added this to the First Prototype PCB milestone 2025-09-21 00:31:48 -04:00
Adog64 changed time estimate to 1h 30m 2025-09-21 00:32:07 -04:00
Adog64 changed reference from ECAD-baseline-microsd-schematic to ECAD#40-revisit-microsd-card 2025-09-21 22:48:16 -04:00
Adog64 moved this to Complete in Electrical Design (ECAD) on 2025-09-22 01:32:39 -04:00
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ECAD#40-revisit-microsd-card
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Reference: Dynamite-Rocketry/dyna-micro#40
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