Initial commit

Author: mcauser

LICENSE

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+MIT License
+
+Copyright (c) 2017 Mike Causer
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.

README.md

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+# P9813
+
+A MicroPython library for P9813 RGB LED drivers.
+
+For example, the Seeed Studio [Grove - Chainable RGB LED](http://wiki.seeed.cc/Grove-Chainable_RGB_LED/).
+
+![demo](docs/demo.jpg)
+
+## Example
+
+Copy the file to your device, using ampy, webrepl or compiling and deploying. eg.
+
+```
+$ ampy put p9813.py
+```
+
+**Basic usage**
+
+```
+from machine import Pin
+import p9813
+
+pin_clk = Pin(5, Pin.OUT)
+pin_data = Pin(4, Pin.OUT)
+
+num_leds = 10
+chain = p9813.P9813(pin_clk, pin_data, num_leds)
+
+# set the first LED to red
+chain[0] = (255, 0, 0)
+
+# set the second LED to green
+chain[1] = (0, 255, 0)
+
+# write data to all LEDs
+chain.write()
+
+# make all LEDs red
+chain.fill((255,0,0))
+chain.write()
+
+# turn off all LEDs
+chain.reset()
+```
+
+See [p9813_examples.py](p9813_examples.py) and [examples](examples/) for more.
+
+## Parts
+
+* [WeMos D1 Mini](https://www.aliexpress.com/store/product/D1-mini-Mini-NodeMcu-4M-bytes-Lua-WIFI-Internet-of-Things-development-board-based-ESP8266/1331105_32529101036.html) $4.00 USD
+* [Grove - Chainable RGB LED](https://www.seeedstudio.com/Grove-Chainable-RGB-LED-p-850.html) $3.90 USD
+* [Grove Male Jumper Cable](https://www.seeedstudio.com/Grove-4-pin-Male-Jumper-to-Grove-4-pin-Conversion-Cable-%285-PCs-per-Pack%29-p-1565.html) $2.90 USD
+
+## Connections
+
+WeMos D1 Mini | Grove Chainable RGB LED
+------------- | -----------------------
+D1 (GPIO5)    | CI (clock) (yellow)
+D2 (GPIO4)    | DI (data) (white)
+3V3 (or 5V)   | VCC (red)
+G             | GND (black)
+
+If you are chaining multiple LEDs, clock out -> clock in, data out -> data in, eg.
+
+LED1 | LED2
+---- | ----
+CO   | CI (yellow)
+DO   | DI (white)
+VCC  | VCC (red)
+GND  | GND (black)
+
+## Links
+
+* [WeMos D1 Mini](https://wiki.wemos.cc/products:d1:d1_mini)
+* [micropython.org](http://micropython.org)
+* [Adafruit Ampy](https://learn.adafruit.com/micropython-basics-load-files-and-run-code/install-ampy)
+* [P9813 datasheet](https://raw.githubusercontent.com/SeeedDocument/Grove-Chainable_RGB_LED/master/res/P9813_datasheet.pdf)

docs/demo.jpg

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+from machine import Pin
+import p9813
+
+pin_clk = Pin(5, Pin.OUT)
+pin_data = Pin(4, Pin.OUT)
+
+num_leds = 10
+chain = p9813.P9813(pin_clk, pin_data, num_leds)
+
+# set the first pixel to red
+chain[0] = (255, 0, 0)
+
+# set the first pixel to green
+chain[1] = (0, 255, 0)
+
+# set the first pixel to blue
+chain[2] = (0, 0, 255)
+
+# changes are not visible until you...
+# write data to all pixels
+chain.write()
+
+# get first pixel colour
+r, g, b = chain[0]
+
+# get second pixel colour
+r, g, b = chain[1]

examples/basic.py

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+from machine import Pin
+import p9813
+from time import sleep_ms
+
+num_leds = 10
+chain = p9813.P9813(Pin(5), Pin(4), num_leds)
+
+def bounce(color, sleep):
+	for i in range(4 * num_leds):
+		for j in range(num_leds):
+			chain[j] = color
+		if (i // num_leds) % 2 == 0:
+			chain[i % num_leds] = (0, 0, 0)
+		else:
+			chain[num_leds - 1 - (i % num_leds)] = (0, 0, 0)
+		chain.write()
+		sleep_ms(sleep)
+
+red = (16,0,0)
+green = (0,16,0)
+colors = [red,green]
+
+# Bounce a dark pixel back and forth
+for color in colors:
+	bounce(color, 0)

examples/bounce.py

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+from machine import Pin
+import p9813
+from time import sleep_ms
+
+num_leds = 10
+chain = p9813.P9813(Pin(5), Pin(4), num_leds)
+
+# Illuminate the pixels one by one
+# X.......
+# XX......
+# XXX.....
+# XXXX....
+# XXXXX...
+# XXXXXX..
+# XXXXXXX.
+# XXXXXXXX
+def color_wipe(color, wait):
+	for i in range(num_leds):
+		chain[i] = color
+		chain.write()
+		sleep_ms(wait)
+
+red = (16,0,0)
+green = (0,16,0)
+blue = (0,0,16)
+cyan = (0,16,16)
+magenta = (16,0,16)
+yellow = (16,16,0)
+black = (0,0,0)
+colors = [red,green,blue,cyan,magenta,yellow,black]
+
+# Illuminate the pixels one by one, keeping them lit
+for color in colors:
+	color_wipe(color, 0)

examples/color_wipe.py

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+from machine import Pin
+import p9813
+from time import sleep_ms
+
+num_leds = 10
+chain = p9813.P9813(Pin(5), Pin(4), num_leds)
+
+def cycle(color, sleep):
+	for i in range(num_leds):
+		for j in range(num_leds):
+			chain[j] = (0, 0, 0)
+		chain[i % num_leds] = color
+		chain.write()
+		sleep_ms(sleep)
+
+# Predefine some colours
+red = (16,0,0)
+green = (0,16,0)
+blue = (0,0,16)
+cyan = (0,16,16)
+magenta = (16,0,16)
+yellow = (16,16,0)
+white = (16,16,16)
+black = (0,0,0)
+colors = [red,green,blue,cyan,magenta,yellow,white,black]
+
+# Illuminate the pixels one by one
+for color in colors:
+	cycle(color, 0)

examples/cycle.py

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+from machine import Pin
+import p9813
+
+num_leds = 10
+chain = p9813.P9813(Pin(5), Pin(4), num_leds)
+
+def fade():
+	for i in range(0, 4 * 256, 8):
+		for j in range(num_leds):
+			if (i // 256) % 2 == 0:
+				val = i & 0xff
+			else:
+				val = 255 - (i & 0xff)
+			chain[j] = (val, 0, 0)
+		chain.write()
+
+# Fade in/out
+fade()

examples/fade.py

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+from machine import Pin
+import p9813
+
+num_leds = 10
+chain = p9813.P9813(Pin(5), Pin(4), num_leds)
+
+red = (16,0,0)
+green = (0,16,0)
+blue = (0,0,16)
+
+chain.fill(red)
+chain.write()
+
+chain.fill(gren)
+chain.write()
+
+chain.fill(blue)
+chain.write()
+
+chain.fill((0,0,0))
+chain.write()
+
+chain.fill((0xff,0x99,0x00))
+chain.write()
+
+chain.reset()

examples/fill.py

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+from machine import Pin
+import p9813
+from time import sleep_ms
+
+num_leds = 10
+chain = p9813.P9813(Pin(5), Pin(4), num_leds)
+
+green = (0,16,0)
+yellow = (16,16,0)
+red = (16,0,0)
+black = (0,0,0)
+colors = [green,green,green,green,green,green,green,yellow,yellow,red]
+
+def level(n):
+	for i in range(num_leds):
+		if n > i:
+			chain[i] = colors[i]
+		else:
+			chain[i] = black
+	chain.write()
+
+# 10 levels, starting with green then yellow then red
+level(5)
+level(0)
+level(10)
+
+for i in range(num_leds + 1):
+	level(i)
+
+
+last = 0
+def level_sticky(n):
+	global last
+	for i in range(num_leds):
+		if n > i:
+			chain[i] = colors[i]
+		elif last > i:
+			(r, g, b) = colors[i]
+			chain[i] = (r//8, g//8, b//8)
+		else:
+			chain[i] = black
+	last = n
+	chain.write()
+
+# 10 levels, with previous level remaining 1/8th lit for 1 step, like a vu meter
+level_sticky(7)
+level_sticky(10)
+level_sticky(8)
+level_sticky(5)
+
+for i in range(0,1000,23):
+	level_sticky(i % num_leds)
+	sleep_ms(50)
+
+# why inc by 23? just a prime number for some pseduo-randomness