树莓派使用1602

需要先开启IIC

• sudo raspi-config

  • 选择第五个 进去后选择I2C然后点是

查看自己的I2C地址

• ls /dev/i2c-*

  • 可能会返回/dev/i2c-1
  • 记住这个1

• sudo i2cdetect -y 1

  • 如果说找不到命令,就需要安装I2C-tools

  • sudo apt-get install i2c-tools python-smbus

  • 记录一下地址

• 在一个目录下写如LCD1602的包

  • #!/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!')
    

  • 其他程序调用这个包 然后使用

    • import LCD1602
      
      LCD1602.init(0x3F, 1)
      
      LCD1602.write(0, 0, 'HELLO')
      LCD1602.write(1, 1, 'WORLD')