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annotate lunalcd3/README @ 72:c2a3670c7aca

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lunalcd3.pcb: manually add bottom strap to LCD footprint
author Mychaela Falconia <falcon@freecalypso.org>
date Thu, 18 Nov 2021 06:11:27 +0000
parents 31c8b1291b4a
children
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71
31c8b1291b4a lunalcd3 project started
Mychaela Falconia <falcon@freecalypso.org>
parents:
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1 Our lunalcd2 board built in 2021-08 (see ../lunalcd2 directory) was a success
31c8b1291b4a lunalcd3 project started
Mychaela Falconia <falcon@freecalypso.org>
parents:
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2 for the most part, but there is one issue: there is an elastic force originating
31c8b1291b4a lunalcd3 project started
Mychaela Falconia <falcon@freecalypso.org>
parents:
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3 somewhere in the area where the LCD module's FPC tail is folded under the body
31c8b1291b4a lunalcd3 project started
Mychaela Falconia <falcon@freecalypso.org>
parents:
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4 of the module, this force acts against both gravity and the adhesive, and it
31c8b1291b4a lunalcd3 project started
Mychaela Falconia <falcon@freecalypso.org>
parents:
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5 pushes the bottom of the LCD module upward, away from the PCB.
31c8b1291b4a lunalcd3 project started
Mychaela Falconia <falcon@freecalypso.org>
parents:
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6
31c8b1291b4a lunalcd3 project started
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
7 Seeking to prevent this cosmetic problem (and possibly one of mechanical
31c8b1291b4a lunalcd3 project started
Mychaela Falconia <falcon@freecalypso.org>
parents:
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8 reliability) on our upcoming Venus board, we got a little metal bracket
31c8b1291b4a lunalcd3 project started
Mychaela Falconia <falcon@freecalypso.org>
parents:
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9 custom-made for us that is designed to hold the bottom of the LCD module in
31c8b1291b4a lunalcd3 project started
Mychaela Falconia <falcon@freecalypso.org>
parents:
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10 place. The present lunalcd3 PCB is a copy of lunalcd2 with the addition of two
31c8b1291b4a lunalcd3 project started
Mychaela Falconia <falcon@freecalypso.org>
parents:
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11 holes matching those in the bracket, thereby allowing this bracket to be used
31c8b1291b4a lunalcd3 project started
Mychaela Falconia <falcon@freecalypso.org>
parents:
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12 to hold down the LCD module.