README: clean up layout
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52eee6a569
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@ -16,6 +16,8 @@ Schematic of 2.0: https://reprap.org/mediawiki/images/7/7d/Melzi-circuit.png
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EXP connector:
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EXP connector:
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----
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----
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On the mainboard:
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PC1 | 1 2 | PA1
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PC1 | 1 2 | PA1
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PC0 | 3 4 | PA2
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PC0 | 3 4 | PA2
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PD3 | 5 6 | PA3
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PD3 | 5 6 | PA3
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@ -23,7 +25,7 @@ EXP connector:
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VCC | 9 10 | GND
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VCC | 9 10 | GND
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LCD board
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LCD board
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===
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---
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| EXP Pin | AVR Pin | AVR Function | Screen board function |
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| EXP Pin | AVR Pin | AVR Function | Screen board function |
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|---------|---------|--------------|-----------------------|
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|---------|---------|--------------|-----------------------|
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@ -39,6 +41,8 @@ LCD board
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Button Matrix
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Button Matrix
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---
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On the LCD board.
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Based on a voltage divider between button(s) pressed and a constant pull-up to VCC.
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Based on a voltage divider between button(s) pressed and a constant pull-up to VCC.
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Resistor to VCC: 4.7k
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Resistor to VCC: 4.7k
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