LCD 16x2 - Raspberry Pi Forums

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hi everyone, doing new project involve in lcd 16x2 green screen. could'nt display , way allow me type message , have instantly displayed on display. link step insert lcd raspberry pi follow. dun kw error. pop out error.

link:
http://4.bp.blogspot.com/-c_isp6kwxja/u ... d44780.png

coding:

code: select all

import rpi.gpio gpio   time import sleep   class lcd:          def __init__(self, pin_rs=7, pin_e=8, pins_db=[25, 24, 23, 18]):              self.pin_rs=pin_rs           self.pin_e=pin_e           self.pins_db=pins_db              gpio.setmode(gpio.bcm)           gpio.setup(self.pin_e, gpio.out)           gpio.setup(self.pin_rs, gpio.out)           pin in self.pins_db:               gpio.setup(pin, gpio.out)              self.clear()          def clear(self):           """ blank / reset lcd """              self.cmd(0x33) # $33 8-bit mode           self.cmd(0x32) # $32 8-bit mode           self.cmd(0x28) # $28 8-bit mode           self.cmd(0x0c) # $0c 8-bit mode           self.cmd(0x06) # $06 8-bit mode           self.cmd(0x01) # $01 8-bit mode          def cmd(self, bits, char_mode=false):           """ send command lcd """              sleep(0.001)           bits=bin(bits)[2:].zfill(8)              gpio.output(self.pin_rs, char_mode)              pin in self.pins_db:               gpio.output(pin, false)              in range(4):               if bits[i] == "1":                   gpio.output(self.pins_db[::-1][i], true)              gpio.output(self.pin_e, true)           gpio.output(self.pin_e, false)              pin in self.pins_db:               gpio.output(pin, false)              in range(4,8):               if bits[i] == "1":                   gpio.output(self.pins_db[::-1][i-4], true)                 gpio.output(self.pin_e, true)           gpio.output(self.pin_e, false)          def message(self, text):           """ send string lcd. newline wraps second line"""              char in text:               if char == '\n':                   self.cmd(0xc0) # next line               else:                   self.cmd(ord(char),true)      if __name__ == '__main__':          lcd = lcd()       lcd.message("raspberry pi\n  take byte!")
error pop out during running:
file "lcd.py",line 67 in <module>
lcd = lcd()

file "lcd.py",line 21 in clear
self.cmd(0x33)

file "lcd.py",line 37 in cmd
gpio.output(pin, false)
please me first time using lcd

that code works me when run sudo python xxx.py.


raspberrypi



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