Arduino-LCD

The LCD library provides an abstract interface for LCD devices and an adapter design pattern to allow device drivers to be reused even when LCD device communication changes. The library includes device drivers for MAX72XX, HD44780 and PCD8544, and adapter using GPIO, Shift Registers, and TWI (PCF8574). There is also support for the LCD4884 and LCD Keypad Shields including keypad.

Version: 1.4

Classes

• LCD Device Driver Support, LCD::Device

Device Drivers

• HD44780
• MAX72XX
• PCD8544

Port Adapters (HD44780)

• HD44780::Adapter
• Debug, Serial
• 3-Wire, Shift Register, GPIO
• 4-Wire, Shift Register, GPIO
• 7-Wire, 4-bit Parallel Port, GPIO
• DFRobot_IIC, PCF8574, TWI
• GY_IICLCD, PCF8574, TWI
• MJKDZ, PCF8574, TWI

Shield Support

• LCD4884
• LCD_Keypad

Example Sketches

• Benchmark measure performance
• Clock display calender and time
• Demo demonstrate the lcd functions
• Keypad show keypad/joy stick support
• Thermometer display temperature

Benchmarks

Note: 1) All measurements are in microseconds. They include an overhead of calling micros() and the resolution is +-4 us. 2) The benchmark fill_screen() depends on the screen size; total number of characters is 32 (16x2) for HD44780 and 84 (14x6) PCD8544.

Nr	Operation	PP7W	SR4W	SR3W	TWI(SW)	TWI(100)	TWI(400)	PCD8544
0	lcd.begin()	54820	49828	54840	58160	58384	55896	4388
1	lcd.write('0')	44	56	60	496	516	176	64
2	lcd.print('0')	44	48	60	496	520	180	68
3	lcd.print("0")	52	56	68	496	528	184	80
4	lcd.print("10")	92	100	124	992	1044	356	136
5	lcd.print("100")	136	148	184	1484	1560	528	208
6	lcd.print("1000")	180	196	240	1976	2080	704	272
7	lcd.print("10000")	228	248	296	2468	2596	880	332
8	lcd.print("Hello World")	496	520	656	5424	5708	1924	716
9	lcd.print(F("Hello World"))	496	516	648	5408	5700	1928	720
10	lcd.print(F("\aHello World\a"))	500	520	656	5420	5720	1932	744
11	lcd.print(F("Hello\tWorld"))	492	520	660	5420	5720	1932	684
12	lcd.print(F("Hello\nWorld"))	1216	1304	1636	13756	14524	4896	1424
13	lcd.print(F("\nHello\tWorld"))	1276	1352	1700	14260	15036	5080	1448
14	fill_screen()	2176	2324	2920	24568	25896	8736	9252
15	lcd.print(0)	96	100	116	540	568	224	120
16	lcd.print(1)	96	96	112	548	572	228	116
17	lcd.print(10)	176	184	208	1072	1128	436	224
18	lcd.print(100)	268	268	300	1608	1684	656	328
19	lcd.print(INT16_MIN)	464	492	560	3156	3308	1256	592
20	lcd.print(INT16_MAX)	432	436	504	2668	2812	1076	532
21	lcd.print(INT32_MIN)	884	912	1044	5808	6096	2316	1112
22	lcd.print(INT32_MAX)	844	868	984	5320	5580	2148	1048
23	lcd.print(1234.56789, 5)	1028	1052	1168	5504	5764	2332	1236
24	lcd.print(-1234.56789, 5)	1068	1100	1232	5988	6280	2504	1296
25	lcd.print(0x8000, BIN)	1320	1360	1548	8480	8912	3404	2428
26	lcd.print(0x8000, DEC)	424	432	492	2664	2796	1072	528
27	lcd.print(0x8000, HEX)	340	348	396	2132	2232	864	428
28	lcd.backlight_off()	4	8	4	212	228	84	4
29	lcd.backlight_on()	8	4	4	208	228	88	4
30	lcd.display_off()	40	44	56	484	512	172	12
31	lcd.display_on()	40	44	56	484	520	168	12
32	lcd.display_normal()	4	4	4	4	4	4	12
33	lcd.display_inverse()	4	4	4	4	4	4	12
34	lcd.display_clear()	1668	1648	1668	2096	2120	1776	4332
35	lcd.cursor_blink_on()	40	44	52	492	512	168	4
36	lcd.cursor_blink_off()	40	44	56	488	516	180	4
37	lcd.cursor_set(0,0)	44	48	56	488	520	176	24
38	lcd.cursor_home()	1660	1648	1668	2096	2124	1776	28
39	lcd.print('\a')	8	4	4	4	4	4	8
40	lcd.print('\b')	132	144	184	1472	1560	532	88
41	lcd.print('\f')	1656	1656	1672	2100	2128	1788	4340
42	lcd.print('\n')	784	836	1044	8836	9320	3160	764
43	lcd.print('\r')	48	52	60	492	520	180	32
44	lcd.print('\t')	52	56	68	504	524	184	36
45	lcd.end()	40	44	56	492	516	172	4340

Dependencies

• Arduino-GPIO
• Arduino-OWI
• Arduino-TWI