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@ -31,27 +31,28 @@ Two PCBs are connected by 15 lines(13 in case of Pro2).
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Vcc and GND use 3(2) lines each, other lines are for keyboard signaling.
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HHKB connector lines:
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JP Pro2 Pro Function Description Teensy++ pins
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JP Pro2 Pro Function Description TMK pin usage
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--------------------------------------------------------------------------------------------
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1 Vcc(5V) 5V
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1 1 2 Vcc(5V) 5V
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2 2 3 Vcc(5V) 5V
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3 3 4 TP1684 KEY: Low(0) when key pressed PE6 input(with pullup)
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4 4 5 TP1684 KEY_PREV: make threshold PE7 output
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3 3 4 TP1684 ~KEY: Low(0) when key is pressed PD7 input(with pullup)
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4 4 5 TP1684 HYS: High(1) when key is pressed PB7 output
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5 5 6 HC4051 A(bit0)\ PB0 output
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6 6 7 HC4051 B(bit1) > select row 0-7 PB1 output
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7 7 8 HC4051 C(bit2)/ PB2 output
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8 8 9 LS145 A(bit0)\ PB3 output
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9 9 10 LS145 B(bit1) > select column 0-7 PB4 output
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10 10 11 LS145 C(bit2)/ PB5 output
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11 11 12 LS145 D(enable) Low(0) enables selected column PB6 output
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11 11 12 LS145 ~D(enable) Low(0) enables selected column PB6 output
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12 12 13 GND GND
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13 13 14 GND GND
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15 GND
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14 HC4051(Z2) ~Enable of Z2 row0-7
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15 HC4051(Z3) ~Enable of Z3 row8-15
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14 HC4051(Z2) ~Enable of Z2 row0-7 PC6
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15 HC4051(Z3) ~Enable of Z3 row8-15 PC7
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NOTE: guessing pin5(KEY_PREV) may work for hysteresis of capacitive sensing.
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NOTE: Probably HYS changes threshold for upstroke and makes hysteresis in the result.
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NOTE: HYS should be given High(1) when previous KEY state is Low(0).
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NOTE: 1KOhm didn't work as pullup resistor on KEY. AVR internal pullup or 10KOhm resistor was OK.
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NOTE: JP has two HC4051(Z2,Z3) and line 5, 6 and 7 are connected to both of them.
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@ -112,7 +113,7 @@ Matrix diagram:
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| <-+ | <6-------|-|-|-|-|-|-|-|--|R|-+
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| 1 4 | | | <7-------|-|-|-|-|-|-|-|--|R|-+
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+---V---^-+ | +-^-^-^--+ 0 1 2 3 4 5 6 7 33K*8
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KEY PREV | A B C +-----------------+
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KEY HYS | A B C +-----------------+
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| | +-^----+ | | | | LS145 |
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Vcc | | |BU9831| | | | +-^--^--^--^------+
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--- | | +------+ | | | A B C D +-------+
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@ -138,7 +139,7 @@ Matrix diagram:
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| | +----> <6-----------|-|-|-|-|----|R|-+
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| | | | | A B C <7-----------|-|-|-|-|----|R|-+
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+---V---^-+ | | +-^-^-^--+ | | | | | |
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KEY PREV | | | | | | | | | | |
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KEY HYS | | | | | | | | | | |
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| | | | +--------+ | | | | | |
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| | | | | HC4051 <8-----------|-|-|-|-|----|R|-+
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| | | | | Z3 <9-----------|-|-|-|-|----|R|-+
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@ -192,7 +193,7 @@ Signals charts
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0123456701234567 selected column
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3) Wait 5us after column select, then set prev, strobe colD to spit out key status and read it.
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prev _~~~~_____ 20us if previous key state is low
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hys _~~~~_____ 20us if previous key state is low
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colD ~~~__~~~~~ 10us strobe
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key ~~~____~~~ 22us indicates current state of the key
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tmk
10 years ago