Arduino
//include the libarary code
#include <Wire.h>
#include <LiquidCrystal_I2C.h>
/*****************************************/
char array1[]="Hellow World! "; //the string to print on the LCD
char array2[]="Hellow World! ";
int tim = 500; //the value of the delay time
// initialize the library with the numbers of the interface pins
LiquidCrystal_I2C lcd(0x27, 16, 2); //set the LCD address to 0x27 for a 16 chars and 2 line display
/****************************************************/
void setup()
{
lcd.init(); //initialize the led
lcd.backlight(); //open the backlight
}
/**********************************************************/
void loop()
{
lcd.setCursor(15, 0); //set the cursor to column 15, line 0
for (int positionCounter1 = 0; positionCounter1 < 26; positionCounter1++)
{
lcd.scrollDisplayLeft(); //Scrolls the contents of the display one space to the left.
lcd.print(array1[positionCounter1]); //Print a massage to the LCD.
delay(tim); //wait for 250 microseconds
}
lcd.clear(); //Clears the LCD screen and positions the cursor in the upper-left corner.
lcd.setCursor(15, 1); //Set the cursor to column 15, line 1
for (int positionCounter = 0; positionCounter < 26; positionCounter++)
{
lcd.scrollDisplayLeft(); //Scrolls the contents of the display one space to the left.
lcd.print(array2[positionCounter]); //Print a message to the LCD.
delay(tim); //wait for 250 microseconds
}
lcd.clear(); //Clears the LCD screen and positions the cursor in the upper-left corner.
}
树莓派
C
#include <stdio.h>
#include <wiringPi.h>
#include <wiringPiI2C.h>
#include <string.h>
int LCDAddr = 0x27;
int BLEN = 1;
int fd;
void write_word(int data){
int temp = data;
if (BLEN == 1)
temp |= 0x08;
else
temp &= 0xF7;
wiringPiI2CWrite(fd, temp);
}
void send_command(int comm){
int buf;
//Send bit7-4 firstly
buf = comm & 0xF0;
buf |= 0x04; //RS = 0, RW = 0, EN = 1
write_word(buf);
delay(2);
buf &= 0xFB; //Make EN = 0
write_word(buf);
//Send bit3-0 secondly
buf = (comm & 0x0F) << 4;
buf |= 0x04; //RS = 0, RW = 0, EN = 1
write_word(buf);
delay(2);
buf &= 0xFB; //Make EN = 0
write_word(buf);
}
void send_data(int data){
int buf;
//Send bit7-4 firstly
buf = data & 0xF0;
buf |= 0x05; //RS = 1, RW = 0, EN = 1
write_word(buf);
delay(2);
buf &= 0xFB; //Make EN = 0;
write_word(buf);
//Send bit 3-0 secondly
buf = (data & 0x0F) << 4;
buf |= 0x05; //RS = 1, RW = 0, EN = 1;
write_word(buf);
delay(2);
buf &= 0xFB; //Make EN = 0;
write_word(buf);
}
void init()
{
send_command(0x33); //Must initialize to 8-line mode at first
delay(5);
send_command(0x32); //Then initialize to 4-line mode
delay(5);
send_command(0x28); //2 Lines & 5*7 dots
delay(5);
send_command(0x0C); //Enable display without cursor
delay(5);
send_command(0x01); //Clear the screen
wiringPiI2CWrite(fd, 0x08);
}
void clear(){
send_command(0x01); //clear the screen
}
void write(int x, int y, char data[]){
int addr, i;
int tmp;
if (x < 0) x = 0;
if (x > 15) x = 15;
if (y < 0) y = 0;
if (y > 1) y = 1;
// Move cursor
addr = 0x80 + 0x40 * y + x;
send_command(addr);
tmp = strlen(data);
for (i = 0; i < tmp; i++){
send_data(data[i]);
}
}
void main(){
fd = wiringPiI2CSetup(LCDAddr);
init();
write(0, 0, "Greeting!");
write(1, 1, "From Robin");
delay(2000);
clear();
}
Python
#!/usr/bin/env python
import LCD1602
import time
def setup():
LCD1602.init(0x27, 1) #init (salve address, background light)
LCD1602.write(0, 0, 'Greetings!')
LCD1602.write(1, 1, 'from Robin')
time.sleep(2)
def loop():
space = ' '
greetings = 'Thank you for buying Sensor Kit for RaspberryPi! ^_^'
greetings = space + greetings
while True:
tmp = greetings
for i in range(0, len(greetings)):
LCD1602.write(0, 0, tmp)
tmp = tmp[1:]
time.sleep(0.8)
LCD1602.clear()
def destroy():
pass
if __name__ == "__main__":
try:
setup()
while True:
loop()
except KeyboardInterrupt:
LCD1602.clear()
LCD1602.py:
#!/usr/bin/env python
import time
import smbus
BUS = smbus.SMBus(1)
def write_word(addr, data):
global BLEN
temp = data
if BLEN == 1:
temp |= 0x08
else:
temp &= 0xF7
BUS.write_byte(addr ,temp)
def send_command(comm):
# Send bit7-4 firstly
buf = comm & 0xF0
buf |= 0x04 # RS = 0, RW = 0, EN = 1
write_word(LCD_ADDR ,buf)
time.sleep(0.002)
buf &= 0xFB # Make EN = 0
write_word(LCD_ADDR ,buf)
# Send bit3-0 secondly
buf = (comm & 0x0F) << 4
buf |= 0x04 # RS = 0, RW = 0, EN = 1
write_word(LCD_ADDR ,buf)
time.sleep(0.002)
buf &= 0xFB # Make EN = 0
write_word(LCD_ADDR ,buf)
def send_data(data):
# Send bit7-4 firstly
buf = data & 0xF0
buf |= 0x05 # RS = 1, RW = 0, EN = 1
write_word(LCD_ADDR ,buf)
time.sleep(0.002)
buf &= 0xFB # Make EN = 0
write_word(LCD_ADDR ,buf)
# Send bit3-0 secondly
buf = (data & 0x0F) << 4
buf |= 0x05 # RS = 1, RW = 0, EN = 1
write_word(LCD_ADDR ,buf)
time.sleep(0.002)
buf &= 0xFB # Make EN = 0
write_word(LCD_ADDR ,buf)
def init(addr, bl):
# global BUS
# BUS = smbus.SMBus(1)
global LCD_ADDR
global BLEN
LCD_ADDR = addr
BLEN = bl
try:
send_command(0x33) # Must initialize to 8-line mode at first
time.sleep(0.005)
send_command(0x32) # Then initialize to 4-line mode
time.sleep(0.005)
send_command(0x28) # 2 Lines & 5*7 dots
time.sleep(0.005)
send_command(0x0C) # Enable display without cursor
time.sleep(0.005)
send_command(0x01) # Clear Screen
BUS.write_byte(LCD_ADDR, 0x08)
except:
return False
else:
return True
def clear():
send_command(0x01) # Clear Screen
def openlight(): # Enable the backlight
BUS.write_byte(0x27,0x08)
BUS.close()
def write(x, y, str):
if x < 0:
x = 0
if x > 15:
x = 15
if y <0:
y = 0
if y > 1:
y = 1
# Move cursor
addr = 0x80 + 0x40 * y + x
send_command(addr)
for chr in str:
send_data(ord(chr))
if __name__ == '__main__':
init(0x27, 1)
write(4, 0, 'Hello')
write(7, 1, 'world!')
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