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29 lines
1.3 KiB
Plaintext
29 lines
1.3 KiB
Plaintext
- 4.5 V rail was intended to provide the ADXL32x with a supply voltage
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that's at a safe distance from its 2.4 V minimum. However, the current
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circuit wouldn't work with the acceleration sensor operating at 4.5 V.
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It turns out the system operates well enough with the 4.5 V rail joined
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to the 3 V rail.
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- the 6 V rail drops to 5 V after relatively little use. Need to improve
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the power supply.
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- connections between boards are sensitive to mechanical forces and break
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easily in the high-g environment we have here. Should consider moving
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to an FPC at least for the LEDs. A stiff support beam (e.g., an
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aluminium rail) helps to reduce mechanical stress.
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- the vertical resolution is a bit coarse. We could improve it and make
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the whole system simpler by adding local demultiplexing with 74HC594
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or 75HC595. Such chips could drive the LEDs directly.
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- the battery pack needs room for a plug. (The original design assumed
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the battery pack would be mounted on the stick, but this now seems
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undesirable, due to the large weight. Current stick weight is about
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120 g and each AA battery would add about 25 g.)
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- the system really ought to have a button or even a joystick for user
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input.
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- once a button is added, we could have local-only operation with images
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coming from Flash.
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