#!/usr/bin/env python # # based on code from lrvick and LiquidCrystal # lrvic - https://github.com/lrvick/raspi-hd44780/blob/master/hd44780.py # LiquidCrystal - https://github.com/arduino/Arduino/blob/master/libraries/LiquidCrystal/LiquidCrystal.cpp # from time import sleep import board import neopixel class Adafruit_CharLCD: # commands LCD_CLEARDISPLAY = 0x01 LCD_RETURNHOME = 0x02 LCD_ENTRYMODESET = 0x04 LCD_DISPLAYCONTROL = 0x08 LCD_CURSORSHIFT = 0x10 LCD_FUNCTIONSET = 0x20 LCD_SETCGRAMADDR = 0x40 LCD_SETDDRAMADDR = 0x80 # flags for display entry mode LCD_ENTRYRIGHT = 0x00 LCD_ENTRYLEFT = 0x02 LCD_ENTRYSHIFTINCREMENT = 0x01 LCD_ENTRYSHIFTDECREMENT = 0x00 # flags for display on/off control LCD_DISPLAYON = 0x04 LCD_DISPLAYOFF = 0x00 LCD_CURSORON = 0x02 LCD_CURSOROFF = 0x00 LCD_BLINKON = 0x01 LCD_BLINKOFF = 0x00 # flags for display/cursor shift LCD_DISPLAYMOVE = 0x08 LCD_CURSORMOVE = 0x00 # flags for display/cursor shift LCD_DISPLAYMOVE = 0x08 LCD_CURSORMOVE = 0x00 LCD_MOVERIGHT = 0x04 LCD_MOVELEFT = 0x00 # flags for function set LCD_8BITMODE = 0x10 LCD_4BITMODE = 0x00 LCD_2LINE = 0x08 LCD_1LINE = 0x00 LCD_5x10DOTS = 0x04 LCD_5x8DOTS = 0x00 def __init__(self, pin_rs=24, pin_e=23, pin_b=4, pins_db=[17, 25, 27, 22], GPIO=None): # Emulate the old behavior of using RPi.GPIO if we haven't been given # an explicit GPIO interface to use if not GPIO: import RPi.GPIO as GPIO self.GPIO = GPIO self.pin_rs = pin_rs self.pin_e = pin_e self.pin_b = pin_b self.pins_db = pins_db self.GPIO.setwarnings(False) self.GPIO.setmode(GPIO.BCM) self.GPIO.setup(self.pin_e, GPIO.OUT) self.GPIO.setup(self.pin_rs, GPIO.OUT) self.GPIO.setup(self.pin_b, GPIO.OUT) for pin in self.pins_db: self.GPIO.setup(pin, GPIO.OUT) self.GPIO.output(self.pin_b, True) self.write4bits(0x33) # initialization self.write4bits(0x32) # initialization self.write4bits(0x28) # 2 line 5x7 matrix self.write4bits(0x0C) # turn cursor off 0x0E to enable cursor self.write4bits(0x06) # shift cursor right self.displaycontrol = self.LCD_DISPLAYON | self.LCD_CURSOROFF | self.LCD_BLINKOFF self.displayfunction = self.LCD_4BITMODE | self.LCD_1LINE | self.LCD_5x8DOTS self.displayfunction |= self.LCD_2LINE """ Initialize to default text direction (for romance languages) """ self.displaymode = self.LCD_ENTRYLEFT | self.LCD_ENTRYSHIFTDECREMENT self.write4bits(self.LCD_ENTRYMODESET | self.displaymode) # set the entry mode self.clear() def begin(self, cols, lines): if (lines > 1): self.numlines = lines self.displayfunction |= self.LCD_2LINE self.currline = 0 def home(self): self.write4bits(self.LCD_RETURNHOME) # set cursor position to zero self.delayMicroseconds(3000) # this command takes a long time! def clear(self): self.write4bits(self.LCD_CLEARDISPLAY) # command to clear display # 3000 microsecond sleep, clearing the display takes a long time self.delayMicroseconds(3000) def setCursor(self, col, row): self.row_offsets = [0x00, 0x40, 0x14, 0x54] if (row > self.numlines): row = self.numlines - 1 # we count rows starting w/0 self.write4bits(self.LCD_SETDDRAMADDR | (col + self.row_offsets[row])) def noDisplay(self): """ Turn the display off (quickly) """ self.GPIO.output(self.pin_b, False) self.displaycontrol &= ~self.LCD_DISPLAYON self.write4bits(self.LCD_DISPLAYCONTROL | self.displaycontrol) def display(self): """ Turn the display on (quickly) """ self.GPIO.output(self.pin_b, True) self.displaycontrol |= self.LCD_DISPLAYON self.write4bits(self.LCD_DISPLAYCONTROL | self.displaycontrol) def noCursor(self): """ Turns the underline cursor on/off """ self.displaycontrol &= ~self.LCD_CURSORON self.write4bits(self.LCD_DISPLAYCONTROL | self.displaycontrol) def cursor(self): """ Cursor On """ self.displaycontrol |= self.LCD_CURSORON self.write4bits(self.LCD_DISPLAYCONTROL | self.displaycontrol) def noBlink(self): """ Turn on and off the blinking cursor """ self.displaycontrol &= ~self.LCD_BLINKON self.write4bits(self.LCD_DISPLAYCONTROL | self.displaycontrol) def noBlink(self): """ Turn on and off the blinking cursor """ self.displaycontrol &= ~self.LCD_BLINKON self.write4bits(self.LCD_DISPLAYCONTROL | self.displaycontrol) def DisplayLeft(self): """ These commands scroll the display without changing the RAM """ self.write4bits(self.LCD_CURSORSHIFT | self.LCD_DISPLAYMOVE | self.LCD_MOVELEFT) def scrollDisplayRight(self): """ These commands scroll the display without changing the RAM """ self.write4bits(self.LCD_CURSORSHIFT | self.LCD_DISPLAYMOVE | self.LCD_MOVERIGHT) def leftToRight(self): """ This is for text that flows Left to Right """ self.displaymode |= self.LCD_ENTRYLEFT self.write4bits(self.LCD_ENTRYMODESET | self.displaymode) def rightToLeft(self): """ This is for text that flows Right to Left """ self.displaymode &= ~self.LCD_ENTRYLEFT self.write4bits(self.LCD_ENTRYMODESET | self.displaymode) def autoscroll(self): """ This will 'right justify' text from the cursor """ self.displaymode |= self.LCD_ENTRYSHIFTINCREMENT self.write4bits(self.LCD_ENTRYMODESET | self.displaymode) def noAutoscroll(self): """ This will 'left justify' text from the cursor """ self.displaymode &= ~self.LCD_ENTRYSHIFTINCREMENT self.write4bits(self.LCD_ENTRYMODESET | self.displaymode) def write4bits(self, bits, char_mode=False): """ Send command to LCD """ self.delayMicroseconds(1000) # 1000 microsecond sleep bits = bin(bits)[2:].zfill(8) self.GPIO.output(self.pin_rs, char_mode) for pin in self.pins_db: self.GPIO.output(pin, False) for i in range(4): if bits[i] == "1": self.GPIO.output(self.pins_db[::-1][i], True) self.pulseEnable() for pin in self.pins_db: self.GPIO.output(pin, False) for i in range(4, 8): if bits[i] == "1": self.GPIO.output(self.pins_db[::-1][i-4], True) self.pulseEnable() def delayMicroseconds(self, microseconds): # divide microseconds by 1 million for seconds seconds = microseconds / float(1000000) sleep(seconds) def pulseEnable(self): self.GPIO.output(self.pin_e, False) # 1 microsecond pause - enable pulse must be > 450ns self.delayMicroseconds(1) self.GPIO.output(self.pin_e, True) # 1 microsecond pause - enable pulse must be > 450ns self.delayMicroseconds(1) self.GPIO.output(self.pin_e, False) self.delayMicroseconds(1) # commands need > 37us to settle def message(self, text): """ Send string to LCD. Newline wraps to second line""" for char in text: if char == '\n': self.write4bits(0xC0) # next line else: self.write4bits(ord(char), True) def defaultPattern(n): return (n % 255, n % 255, n % 255) class LightStrip: def __init__(self, data_pin = board.D18, string_length = 300, brightness = 1, pixel_order = neopixel.GRB): # Emulate the old behavior of using RPi.GPIO if we haven't been given # an explicit GPIO interface to use self.np = neopixel.NeoPixel(data_pin, string_length, brightness = brightness, auto_write=False, pixel_order = pixel_order) self.pattern = defaultPattern def pattern(self, pattern_callback): self.pattern = pattern_callback def tick(self): np = self.np n = np.n for i in range(n): col = self.pattern(i) if np[i] != col: np[i] = col debug_statements = True def debug(msg): if debug_statements: print(msg) def lightlevel(lcd, level): debug("display level") lcd.clear() lcd.message("Light Level:\n]" + "-"*level + "[") def querylightlevel(): debug("NYI") return 7 def color(lcd, col): lcd.clear() lcd.message("new color:\n#{}".format(col)) debug("NYI") def querycolor(): debug("NYI") return "ffffff" def loop(): lcd = Adafruit_CharLCD() lights = LightStrip() level = 0 level_max = 14 idle = 0 idle_max = 15 cur_color = "ffffff" while True: debug("loop") query_color = querycolor() query_level = querylightlevel() idle = idle + 1 debug("idle value: {}".format(idle)) if query_color != cur_color: if lcd.displaycontrol & lcd.LCD_DISPLAYON != lcd.displaycontrol: lcd.display() ccolor = query_color idle = 0 color(lcd, cur_color) elif query_level != level: level = query_level idle = 0 if lcd.displaycontrol & lcd.LCD_DISPLAYON != lcd.displaycontrol: lcd.display() lightlevel(lcd, level) elif idle >= idle_max: debug("hit idle threshold") idle = idle_max lcd.noDisplay() else: lightlevel(lcd, level) sleep(1) if __name__ == '__main__': loop()