Merge pull request #6 from ubidefeo/dev

Auto-detect of RGB Display.

Author: ubidefeo

README.md

@@ -6,7 +6,7 @@ This library is designed to support a MicroPython interface for i2c LCD characte
 
 ![RGB](assets/LCDRGB.jpg)
 
-[Grove LCD RGB Backlight v2.0, v3.0, v4.0](https://wiki.seeedstudio.com/Grove-LCD_RGB_Backlight/)
+[Grove LCD RGB Backlight v2.0, v3.0, v4.0, v5.0](https://wiki.seeedstudio.com/Grove-LCD_RGB_Backlight/)
 
 ![RGB](assets/LCDMONO.jpg)
 
@@ -60,8 +60,8 @@ Changes the color of the LCD Backlight to (r,g,b)
 Examples are provided in the _examples_ folder.
 
 **Note:**
-To use Grove RGB Display versions older than V5.0 you will need to initialize the Display object supplying the model
+Grove RGB Display initialisation is auto-detected, hence just supply the bus.
 
 ```Python
-my_display = RGBDisplay(i2c_bus, 0x3e, RGBDisplay.GROVE_RGB_V4)
+my_display = RGBDisplay(i2c_bus)
 ```

examples/color_cycle.py

@@ -1,19 +1,13 @@
 # This example only works with Grove RGB Backlight i2c LCD Displays
-#
-# Version 5.0 replaced the LED controller, requiring some changes.
-# Please specify which version you use
+# https://wiki.seeedstudio.com/Grove-LCD_RGB_Backlight/
 
 from i2c_lcd import RGBDisplay
 from machine import I2C
 
 i2c = I2C(0)
 
-# Defaults to Grove RGB LCD Display v5.0
-# for versions until V4.0 use 
-# d = RGBDisplay(i2c, RGBDisplay.GROVE_RGB_V4)
 d = RGBDisplay(i2c)
 
-
 d.home()
 d.write('Hello World')
 

examples/helloworld.py

@@ -1,6 +1,6 @@
-# This example works with both Grove i2c LCD Displays:
-# - Black on Yellow
-# - RGB Backlight 
+# This example works with both Multiple i2c LCD Displays, including the following from Seeed Studio:
+# - Grove LCD RGB Backlight
+# - Grove LCD 16x2 (single color backlight)
 
 import i2c_lcd
 from machine import I2C

i2c_lcd/i2c_lcd.py

@@ -51,13 +51,15 @@ def move(self, col, row):
 
 class RGBDisplay(Display):
     # Grove RGB Display versions
-    GROVE_RGB_V4 = (4, 0x62) # version 3-4
-    GROVE_RGB_V5 = (5, 0x30) # version 5 replaced the LED controller
+    GROVE_RGB_V4_ADDRESS = 0x62 # version 3-4
+    GROVE_RGB_V5_ADDRESS = 0x30 # version 5 replaced the LED controller
 
     backlight = None
 
-    def __init__(self, i2c, lcd_addr=0x3e, display_version = GROVE_RGB_V5):
-        rgb_addr = display_version[1]
+    def __init__(self, i2c, lcd_addr=0x3e):
+        i2c_devices = i2c.scan()
+        display_version = self.GROVE_RGB_V5_ADDRESS if self.GROVE_RGB_V5_ADDRESS in i2c_devices else self.GROVE_RGB_V4_ADDRESS
+        rgb_addr = display_version
         self.backlight = Backlight(i2c, rgb_addr)
         super().__init__(i2c, lcd_addr)