19 lines
398 B
Markdown
19 lines
398 B
Markdown
# Documentation
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## 1.0 Keypad
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The kepad is driven by an io-expander. Thus it can be acessed over i2c.
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Adress 0x21
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### 1.1 Wiring
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* Red: 3.3V
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* Black GND
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* Green SDA -> D3
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* Grey SCL -> D4
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## 2.0 LCD
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The LCD display is driven on the same i2c bus as the keypad.
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nterface Definition
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BYTE BIT
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7 (MSB) 6 5 4 3 2 1 0 (LSB)
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I2C slave address L H L L A2 A1 A0 R/W
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I/O data bus P7 P6 P5 P4 P3 P2 P1 P0
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