HD44780 LCDs
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Contents |
Overview
- Bus: HD44780 LCD test library.
- Connections: two pins (SDA/SCL) and ground.
- Output types: open drain/open collector (pull-up resistors required).
- Pull-up resistors: always required (2K – 10K).
- Maximum voltage: 5.5volts (5volt safe)
- Adapter: PCF8574 I2C expander IC, (see our adapter board).
- Last documentation update: v5.6.
Syntax
| A/a/@ | Toggle auxiliary pin. Capital “A” sets AUX high, small “a” sets to ground. @ sets aux to input (high impedance mode) and reads the pin value. |
| D/d | Measure voltage on the ADC pin (v1+ hardware only). |
| W/w | Capital ‘W’ enables the on-board power supplies. Small ‘w’ disables them. (v1+ hardware only). |
| { or [ | RS low. Next read/write is a COMMAND. |
| ] or } | RS high. Next read/write is TEXT/DATA. |
| r | Read one byte (r:1…255 for bulk reads). |
| 0b | Write this binary value. Format is 0b00000000 for a byte, but partial bytes are also fine: 0b1001. |
| 0x | Write this HEX value. Format is 0×01. Partial bytes are fine: 0xA. A-F can be lower-case or capital letters. |
| 0-255 | Write this decimal value. Any number not preceded by 0x or 0b is interpreted as a decimal value. |
| , | Value delimiter. Use a coma or space to separate numbers. Any combination is fine, no delimiter is required between non-number values: {0xa6,0, 0 16 5 0b111 0xaF}. |
| & | Delay 1uS. (&:1…255 for multiple delays) |
| (#) | Run macro, (0) for macro list |
| 0 | Macro menu |
| 1 | LCD reset. |
| 2 | Init LCD. |
| 3 | Clear LCD. |
| 4 | Cursor position ex:(4:0). |
| 5 | Write test text. (deprecated) |
| 6 | Write :number test numbers ex:(6:80). |
| 7 | Write :number test characters ex:(7:80). |
| 8 | Insert text at cursor. |
