Difference between revisions of "BakeBit - Sound Sensor"

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[[BakeBit - Sound Sensor/zh|查看中文]]
 
[[BakeBit - Sound Sensor/zh|查看中文]]
 +
 +
==介绍==
 +
[[File:BakeBit - Sound Sensor.jpg|thumb|Sound Sensor]]
 +
*BakeBit - Sound Sensor是一个声音检测模块,用于检测声音信号。模块使用了一个内置对声音敏感的电容式驻极体话筒检测声波信号,声波使话筒内的驻极体薄膜振动,导致电容的变化,而产生与之对应变化的微小电压,经过LM358放大后输出。
 +
*在默认状态下模块输出高电平,当检测到有声音的时候输出低电平,声音消失后恢复高电平,没有延时。
 +
 +
==特性==
 +
* 使用标准的2.0mm 4 Pin BakeBit接口
 +
[[File:BakeBit - Sound Sensor_PCB.png | frameless|320px|BakeBit - Sound Sensor]]
 +
 +
* 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:Sound Sensor ==
 +
 +
这个示例用Sound Sensor实现一个声控开关,当检测到环境声音达到指定的分贝时,点亮LED。
 +
 +
=== 硬件连接 ===
 +
简单的将 Sound Sensor 模块插入 A0 接口,将 LED 插入 D5 接口,如下面这样:
 +
 +
::{| class="wikitable"
 +
|-
 +
|[[File:Sound Sensor-1.jpg |frameless|300px]]    || [[File:Sound Sensor-2.jpg |frameless|300px]]
 +
|-
 +
|}
 +
 +
=== 示例源代码 ===
 +
 +
<syntaxhighlight lang="python">
 +
import time
 +
import bakebit
 +
 +
# Connect the BakeBit Sound Sensor to analog port A0
 +
# SIG,NC,VCC,GND
 +
sound_sensor = 0
 +
 +
# Connect the BakeBit LED to digital port D5
 +
# SIG,NC,VCC,GND
 +
led = 5
 +
 +
bakebit.pinMode(sound_sensor,"INPUT")
 +
bakebit.pinMode(led,"OUTPUT")
 +
 +
# The threshold to turn the led on 400.00 * 5 / 1024 = 1.95v
 +
threshold_value = 400
 +
 +
while True:
 +
    try:
 +
        # Read the sound level
 +
        sensor_value = bakebit.analogRead(sound_sensor)
 +
 +
        # If loud, illuminate LED, otherwise dim
 +
        if sensor_value > threshold_value:
 +
            bakebit.digitalWrite(led,1)
 +
        else:
 +
            bakebit.digitalWrite(led,0)
 +
 +
        print("sensor_value = %d" %sensor_value)
 +
        time.sleep(.2)
 +
 +
    except IOError:
 +
        print ("Error")
 +
</syntaxhighlight>
 +
 +
[https://github.com/friendlyarm/BakeBit/blob/master/Software/Python/bakebit_sound_sensor.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_sound_sensor.py:
 +
<syntaxhighlight lang="bash">
 +
cd ~/BakeBit/Software/Python
 +
sudo python bakebit_sound_sensor.py
 +
</syntaxhighlight>
 +
 +
=== 运行结果 ===
 +
 +
对着声音传感器制造点声音,例如拍打手掌,LED将被亮起。
 +
 +
==相关资料==
 +
*[Schematic]([http://wiki.friendlyarm.com/wiki/images/f/ff/02-SCHEMATIC_Sound_Sensor.pdf BakeBit - Sound Sensor.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 15:32, 14 December 2016

查看中文

1 介绍

Sound Sensor
  • BakeBit - Sound Sensor是一个声音检测模块,用于检测声音信号。模块使用了一个内置对声音敏感的电容式驻极体话筒检测声波信号,声波使话筒内的驻极体薄膜振动,导致电容的变化,而产生与之对应变化的微小电压,经过LM358放大后输出。
  • 在默认状态下模块输出高电平,当检测到有声音的时候输出低电平,声音消失后恢复高电平,没有延时。

2 特性

  • 使用标准的2.0mm 4 Pin BakeBit接口

BakeBit - Sound Sensor

  • 引脚说明:
名称 描述
GND
5V 电源5V
NC
SIG 信号

3 示例程序:Sound Sensor

这个示例用Sound Sensor实现一个声控开关,当检测到环境声音达到指定的分贝时,点亮LED。

3.1 硬件连接

简单的将 Sound Sensor 模块插入 A0 接口,将 LED 插入 D5 接口,如下面这样:

Sound Sensor-1.jpg Sound Sensor-2.jpg

3.2 示例源代码

import time
import bakebit
 
# Connect the BakeBit Sound Sensor to analog port A0
# SIG,NC,VCC,GND
sound_sensor = 0
 
# Connect the BakeBit LED to digital port D5
# SIG,NC,VCC,GND
led = 5
 
bakebit.pinMode(sound_sensor,"INPUT")
bakebit.pinMode(led,"OUTPUT")
 
# The threshold to turn the led on 400.00 * 5 / 1024 = 1.95v
threshold_value = 400
 
while True:
    try:
        # Read the sound level
        sensor_value = bakebit.analogRead(sound_sensor)
 
        # If loud, illuminate LED, otherwise dim
        if sensor_value > threshold_value:
            bakebit.digitalWrite(led,1)
        else:
            bakebit.digitalWrite(led,0)
 
        print("sensor_value = %d" %sensor_value)
        time.sleep(.2)
 
    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_sound_sensor.py:

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

3.4 运行结果

对着声音传感器制造点声音,例如拍打手掌,LED将被亮起。

4 相关资料