Added timer script

rpi/lcd-screen/lcd.py

@@ -0,0 +1,89 @@
+import time,sys
+from grove_rgb_lcd import lcd
+
+
+if sys.platform == 'uwp':
+    import winrt_smbus as smbus
+    bus = smbus.SMBus(1)
+else:
+    import smbus
+    import RPi.GPIO as GPIO
+    rev = GPIO.RPI_REVISION
+    if rev == 2 or rev == 3:
+        bus = smbus.SMBus(1)
+    else:
+        bus = smbus.SMBus(0)
+
+# this device has two I2C addresses
+DISPLAY_RGB_ADDR = 0x62
+DISPLAY_TEXT_ADDR = 0x3e
+
+# set backlight to (R,G,B) (values from 0..255 for each)
+def setRGB(r,g,b):
+    bus.write_byte_data(DISPLAY_RGB_ADDR,0,0)
+    bus.write_byte_data(DISPLAY_RGB_ADDR,1,0)
+    bus.write_byte_data(DISPLAY_RGB_ADDR,0x08,0xaa)
+    bus.write_byte_data(DISPLAY_RGB_ADDR,4,r)
+    bus.write_byte_data(DISPLAY_RGB_ADDR,3,g)
+    bus.write_byte_data(DISPLAY_RGB_ADDR,2,b)
+
+# send command to display (no need for external use)
+def textCommand(cmd):
+    bus.write_byte_data(DISPLAY_TEXT_ADDR,0x80,cmd)
+
+# set display text \n for second line(or auto wrap)
+def setText(text):
+    textCommand(0x01) # clear display
+    time.sleep(.05)
+    textCommand(0x08 | 0x04) # display on, no cursor
+    textCommand(0x28) # 2 lines
+    time.sleep(.05)
+    count = 0
+    row = 0
+    for c in text:
+        if c == '\n' or count == 16:
+            count = 0
+            row += 1
+            if row == 2:
+                break
+            textCommand(0xc0)
+            if c == '\n':
+                continue
+        count += 1
+        bus.write_byte_data(DISPLAY_TEXT_ADDR,0x40,ord(c))
+
+#Update the display without erasing the display
+def setText_norefresh(text):
+    textCommand(0x02) # return home
+    time.sleep(.05)
+    textCommand(0x08 | 0x04) # display on, no cursor
+    textCommand(0x28) # 2 lines
+    time.sleep(.05)
+    count = 0
+    row = 0
+    while len(text) < 32: #clears the rest of the screen
+        text += ' '
+    for c in text:
+        if c == '\n' or count == 16:
+            count = 0
+            row += 1
+            if row == 2:
+                break
+            textCommand(0xc0)
+            if c == '\n':
+                continue
+        count += 1
+        bus.write_byte_data(DISPLAY_TEXT_ADDR,0x40,ord(c))
+
+# example code
+if __name__=="__main__":
+    setRGB(255, 255, 255)
+    # Total time in seconds
+    total_seconds = 5 * 60
+
+    while total_seconds >= 0:
+        minutes = total_seconds // 60
+        seconds = total_seconds % 60
+        setText(f"{minutes:02d}:{seconds:02d}")
+        time.sleep(1)
+        total_seconds -= 1