Arduino UNO LCD shield s tipkami Keyestudio
1. Display capacity: 16 × 2 characters
2. Chip operating voltage: 4.5-5.5V
3. Operating Current: 2.0mA (5.0V)
4. Module best working voltage: 5.0V
5. Character size: 2.95 × 4.35 (W × H) mm
1 VSS Power Ground 9 D2 Data
2 VDD Power Positive 10 D3 Data
3 VL liquid crystal display bias 11 D4 data
4 RS Data / Command Select 12 D5 data
5 R / W R / W Selects 13 D6 data
6 E Enable signal 14 D7 data
7 D0 Data 15 BLA Backlight Positive
8 D1 Data 16 BLK Backlight negative
1 feet: VSS for the ground power.
2 feet: VDD 5V power supply is connected.
3 feet: VL for LCD contrast adjustment side, then the power supply is the weakest contrast, grounding contrast
Maximum, high contrast will produce “ghosting”, can be used when a 10K potentiometer to adjust the contrast.
4 feet: RS for the register selection, select the high data register, low when the instruction select register.
5 feet: R / W for the read and write signal lines, high when the read operation, low when the write operation. When RS
And R / W together for the low level can be written to the instruction or display address, when the RS is low when the R / W is high
Can read busy signal, when RS is high level R / W is low level can write data.
6 feet: E-side is enabled, when the E-level jump from high to low, the LCD module to execute the command.
7 to 14 feet: D0 ~ D7 for the 8-bit bi-directional data lines.
15 feet: backlight cathode.
16 feet: backlight negative.
1602 LCD module internal controller a total of 11 control instructions, as shown in the table below:
No. Instruction RS R / W D7 D6 D5 D4 D3 D2 D1 D0
1 Clear screen 0 0 0 0 0 0 0 0 0 1
2 Cursor Return 0 0 0 0 0 0 0 0 1 *
3 Set input mode 0 0 0 0 0 0 0 1 I / D S
4 Display On / Off Control 0 0 0 0 0 0 1 D C B
5 Cursor or character shift 0 0 0 0 0 1 S / C R / L * *
6 Set Function 0 0 0 0 1 DL N F * *
7 Set character generation memory address 0 0 0 1 Character generation memory address
8 Set data memory address 0 0 1 Display data memory address
9 Read busy flag or address 0 1 BF counter address
10 Write to CGRAM or DDRAM) 1 0 Data to be written
11 Read data from CGRAM or DDRAM 1 1 Read the data contents
1602 LCD module read and write operations, the screen and cursor operations are programmed through the instructions to achieve. (Note: 1 is high, 0 is low)
Instruction 1: Clear display, instruction code 01H, cursor reset to address 00H.
Command 2: The cursor is reset and the cursor returns to address 00H.
Instruction 3: Cursor and display mode setting I / D: Cursor moving direction, high level shifting to the right, low level moving left S:
All text on the screen moves left or right. High level means active, low level is invalid.
Command 4: Display switch control. D: control the overall display on and off, said high-open display, low power
Flat display off display C: control cursor on and off, high means that there is a cursor, low level that no cursor B: control
Whether the cursor is flashing, high level flashing, low level does not flicker.
Instruction 5: Cursor or display shift S / C: Moves the displayed text at high level, and moves the cursor at low level.
Instruction 6: Function setting command DL: 4-bit bus at high level, 8-bit bus at low level N: Low power
Usually single-line display, high-level double-line display F: low level display 5×7 dot matrix characters, high level display
5×10 dot matrix characters.
Command 7: Character generator RAM address setting.
Instruction 8: DDRAM address setting.
Instruction 9: Read busy signal and cursor address BF: Busy flag, high level means busy, then module can not connect
Command or data received, if the low level that is not busy.
Command 10: Write data.
Command 11: Read data.
Compatible with the HD44780 chip timing table is as follows:
Read status input RS = L, R / W = H, E = H Output D0-D7 = Status word
Write command input RS = L, R / W = L, D0-D7 = Instruction code, E = High pulse output None
Read data input RS = H, R / W = H, E = H output D0-D7 = data
Write Data Inputs RS = H, R / W = L, D0-D7 = Data, E = High Pulse Output None