Difference between revisions of "BakeBit - LED Bar"

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[[BakeBit - LED Bar/zh|查看中文]]
 
[[BakeBit - LED Bar/zh|查看中文]]
 +
 +
==介绍==
 +
[[File:BakeBit - LED Bar.jpg|thumb|LED Bar]]
 +
*BakeBit - LED-Bar是一个多彩led模块，模块使用了五个内部集成了Ws2812控制芯片的多彩LED，每个LED内部有R、G、B三个发光二极管。Ws2812控制芯片串行读取控制信号，并从中提取出RGB颜色分量，再分别控制R、G、B发光二极管的亮度，混色出不同的色彩。每个像素点的三基色颜色可实现256级亮度显示，总共完成16777216种颜色的全真色彩显示。
 +
*五个LED串行级联，只需要串行的写入控制信号，五个LED便会发出缤纷斑斓的色彩。
 +
 +
==特性==
 +
* 使用标准的2.0mm 4 Pin BakeBit接口
 +
* 多彩R、G、B LED
 +
* 全真色彩显示
 +
[[File:BakeBit - LED Bar_PCB.png | frameless|400px|BakeBit - LED Bar]]
 +
 +
* 引脚说明:
 +
{| class="wikitable"
 +
|-
 +
|名称 || 描述
 +
|-
 +
|GND  || 地
 +
|-
 +
|5V    || 电源5V
 +
|-
 +
|NC    || 空
 +
|-
 +
|SIG  || 信号
 +
|}
 +
== 示例程序(1)：LED Bar ==
 +
 +
这个项目实现类拟音量调节的效果，用到电位器模块和LED Bar。<br />
 +
本示例需要配合[[BakeBit - Rotary Angle Sensor]]使用。
 +
 +
=== 硬件连接 ===
 +
简单的将 LED Bar 模块插入 D3 接口，将 电位器 插入 A0 接口，如下面这样：
 +
 +
::{| class="wikitable"
 +
|-
 +
|[[File:LED Bar-1.jpg |frameless|300px]]    || [[File:LED Bar-2.jpg |frameless|300px]]
 +
|-
 +
|}
 +
 +
=== 示例源代码 ===
 +
 +
<syntaxhighlight lang="python">
 +
 +
import time
 +
import bakebit
 +
import random
 +
 +
# Connect the BakeBit LED Bar to digital port D3
 +
# DI,DCKI,VCC,GND
 +
ledbar = 3
 +
 +
# Connect the BakeBit Rotary Angle Sensor to analog port A0
 +
# SIG,NC,VCC,GND
 +
potentiometer = 0
 +
 +
# Reference voltage of ADC is 5v
 +
adc_ref = 5
 +
 +
# Vcc of the bakebit interface is normally 5v
 +
bakebit_vcc = 5
 +
 +
# Full value of the rotary angle is 360 degrees, as per it's specs (0 to 360)
 +
full_angle = 360
 +
 +
bakebit.pinMode(potentiometer,"INPUT")
 +
bakebit.pinMode(ledbar,"OUTPUT")
 +
time.sleep(1)
 +
 +
# LED Bar methods
 +
# bakebit.bakeBitLedBar_Init(pin, chipset, numOfLED)
 +
# bakebit.bakeBitLedBar_Release(pin)
 +
# bakebit.bakeBitLedBar_Show(pin,colorHigh,colorLow)
 +
 +
bakebit.bakeBitLedBar_Init(ledbar, 0, 5)
 +
time.sleep(.5)
 +
 +
old_color = 0
 +
while True:
 +
    try:
 +
        # Read sensor value from potentiometer
 +
        sensor_value = bakebit.analogRead(potentiometer)
 +
 +
        # Calculate voltage
 +
        voltage = round((float)(sensor_value) * adc_ref / 1023, 2)
 +
 +
        # Calculate rotation in degrees (0 to 360)
 +
        degrees = round((voltage * full_angle) / bakebit_vcc, 2)
 +
        print("sensor_value = %d voltage = %.2f degrees = %.1f" % (sensor_value, voltage, degrees))
 +
 +
        color16bit = 0
 +
        if degrees > 0:
 +
            color16bit = color16bit | bakebit.Green
 +
        if degrees > 72:
 +
            color16bit = color16bit | (bakebit.Green<<3)
 +
        if degrees > 144:
 +
            color16bit = color16bit | (bakebit.Green << 6)
 +
        if degrees > 216:
 +
            color16bit = color16bit | (bakebit.Yellow << 9)
 +
        if degrees > 288:
 +
            color16bit = color16bit | (bakebit.Red << 12)
 +
        if degrees == 360:
 +
            color16bit = 0
 +
            color16bit = color16bit | bakebit.Red
 +
            color16bit = color16bit | (bakebit.Red << 3)
 +
            color16bit = color16bit | (bakebit.Red << 6)
 +
            color16bit = color16bit | (bakebit.Red << 9)
 +
            color16bit = color16bit | (bakebit.Red << 12)
 +
 +
        if color16bit == old_color:
 +
            continue
 +
        old_color = color16bit
 +
 +
        lowBits = color16bit & 255
 +
        highBits = (color16bit & (255<<8))>>8
 +
        print("%s %s" % ('{0:08b}'.format(highBits), '{0:08b}'.format(lowBits)))
 +
        bakebit.bakeBitLedBar_Show(ledbar, highBits, lowBits)
 +
        time.sleep(.2)
 +
 +
    except KeyboardInterrupt:
 +
        bakebit.bakeBitLedBar_Release(ledbar)
 +
        time.sleep(.2)
 +
        break
 +
    except IOError:
 +
        print ("Error")
 +
</syntaxhighlight>
 +
 +
[https://github.com/friendlyarm/BakeBit/blob/master/Software/Python/bakebit_prj_LEDBar_And_RotaryAngleSensor.py Github]
 +
 +
 +
=== 运行示例 ===
 +
 +
假设你已经参考[http://wiki.friendlyarm.com/bakebit bakebit教程]安装了BakeBit源代码，<br />
 +
要运行示例程序，可以在开发板上进入 BakeBit/Software/Python目录,运行bakebit_prj_LEDBar_And_RotaryAngleSensor.py:
 +
<syntaxhighlight lang="bash">
 +
cd ~/BakeBit/Software/Python
 +
sudo python bakebit_prj_LEDBar_And_RotaryAngleSensor.py
 +
</syntaxhighlight>
 +
 +
=== 运行结果 ===
 +
 +
旋转电位器，LED Bar上被点亮的LED个数将根据你的操作角度而进行变化。
 +
 +
 +
== 示例程序(2)：Smart Lighting ==
 +
该示例利用[[BakeBit - Light Sensor]]亮度传感器，聪明地控制灯光(灯用LED Bar来模拟)，环境越暗就让灯越亮，环境亮度足够时，就将灯变暗或者熄灭。<br />
 +
该示例是配合[[BakeBit - Light Sensor]]来实现的，可参考[[BakeBit - Light Sensor]]页面。
 +
 +
==相关资料==
 +
*[Schematic]([http://wiki.friendlyarm.com/wiki/images/0/08/07-SCHEMATIC_LED_Bar.pdf BakeBit - LED Bar.pdf])
 +
*[BakeBit Github项目](https://github.com/friendlyarm/BakeBit)
 +
*[BakeBit Starter Kit手册](http://wiki.friendlyarm.com/bakebit/bakebit_starter_kit_manual_cn.pdf)

Revision as of 08:20, 13 December 2016

查看中文

1 介绍

LED Bar
  • BakeBit - LED-Bar是一个多彩led模块，模块使用了五个内部集成了Ws2812控制芯片的多彩LED，每个LED内部有R、G、B三个发光二极管。Ws2812控制芯片串行读取控制信号，并从中提取出RGB颜色分量，再分别控制R、G、B发光二极管的亮度，混色出不同的色彩。每个像素点的三基色颜色可实现256级亮度显示，总共完成16777216种颜色的全真色彩显示。
  • 五个LED串行级联，只需要串行的写入控制信号，五个LED便会发出缤纷斑斓的色彩。

2 特性

  • 使用标准的2.0mm 4 Pin BakeBit接口
  • 多彩R、G、B LED
  • 全真色彩显示

BakeBit - LED Bar

  • 引脚说明:
名称 描述
GND 地
5V 电源5V
NC 空
SIG 信号

3 示例程序(1)：LED Bar

这个项目实现类拟音量调节的效果，用到电位器模块和LED Bar。
本示例需要配合BakeBit - Rotary Angle Sensor使用。

3.1 硬件连接

简单的将 LED Bar 模块插入 D3 接口，将 电位器 插入 A0 接口，如下面这样：

LED Bar-1.jpg LED Bar-2.jpg

3.2 示例源代码

import time
import bakebit
import random
 
# Connect the BakeBit LED Bar to digital port D3
# DI,DCKI,VCC,GND
ledbar = 3
 
# Connect the BakeBit Rotary Angle Sensor to analog port A0
# SIG,NC,VCC,GND
potentiometer = 0
 
# Reference voltage of ADC is 5v
adc_ref = 5
 
# Vcc of the bakebit interface is normally 5v
bakebit_vcc = 5
 
# Full value of the rotary angle is 360 degrees, as per it's specs (0 to 360)
full_angle = 360
 
bakebit.pinMode(potentiometer,"INPUT")
bakebit.pinMode(ledbar,"OUTPUT")
time.sleep(1)
 
# LED Bar methods
# bakebit.bakeBitLedBar_Init(pin, chipset, numOfLED)
# bakebit.bakeBitLedBar_Release(pin)
# bakebit.bakeBitLedBar_Show(pin,colorHigh,colorLow)
 
bakebit.bakeBitLedBar_Init(ledbar, 0, 5)
time.sleep(.5)
 
old_color = 0
while True:
    try:
        # Read sensor value from potentiometer
        sensor_value = bakebit.analogRead(potentiometer)
 
        # Calculate voltage
        voltage = round((float)(sensor_value) * adc_ref / 1023, 2)
 
        # Calculate rotation in degrees (0 to 360)
        degrees = round((voltage * full_angle) / bakebit_vcc, 2)
        print("sensor_value = %d voltage = %.2f degrees = %.1f" % (sensor_value, voltage, degrees))
 
        color16bit = 0
        if degrees > 0:
            color16bit = color16bit | bakebit.Green
        if degrees > 72:
            color16bit = color16bit | (bakebit.Green<<3)
        if degrees > 144:
            color16bit = color16bit | (bakebit.Green << 6)
        if degrees > 216:
            color16bit = color16bit | (bakebit.Yellow << 9)
        if degrees > 288:
            color16bit = color16bit | (bakebit.Red << 12)
        if degrees == 360:
            color16bit = 0
            color16bit = color16bit | bakebit.Red
            color16bit = color16bit | (bakebit.Red << 3)
            color16bit = color16bit | (bakebit.Red << 6)
            color16bit = color16bit | (bakebit.Red << 9)
            color16bit = color16bit | (bakebit.Red << 12)
 
        if color16bit == old_color:
            continue
        old_color = color16bit
 
        lowBits = color16bit & 255
        highBits = (color16bit & (255<<8))>>8
        print("%s %s" % ('{0:08b}'.format(highBits), '{0:08b}'.format(lowBits)))
        bakebit.bakeBitLedBar_Show(ledbar, highBits, lowBits)
        time.sleep(.2)
 
    except KeyboardInterrupt:
        bakebit.bakeBitLedBar_Release(ledbar)
        time.sleep(.2)
        break
    except IOError:
        print ("Error")

Github


3.3 运行示例

假设你已经参考bakebit教程安装了BakeBit源代码，
要运行示例程序，可以在开发板上进入 BakeBit/Software/Python目录,运行bakebit_prj_LEDBar_And_RotaryAngleSensor.py: 

cd ~/BakeBit/Software/Python
sudo python bakebit_prj_LEDBar_And_RotaryAngleSensor.py

3.4 运行结果

旋转电位器，LED Bar上被点亮的LED个数将根据你的操作角度而进行变化。


4 示例程序(2)：Smart Lighting

该示例利用BakeBit - Light Sensor亮度传感器，聪明地控制灯光(灯用LED Bar来模拟)，环境越暗就让灯越亮，环境亮度足够时，就将灯变暗或者熄灭。
该示例是配合BakeBit - Light Sensor来实现的，可参考BakeBit - Light Sensor页面。

5 相关资料

Retrieved from "https://wiki.friendlyelec.com/wiki/index.php?title=BakeBit_-_LED_Bar&oldid=8307"