B_soundSensorEnabledByButton

Sound sensor enabled by a button

• The board reads the value coming from the sound sensor only when the button is pushed down.
• The information regarding the value from the sound sensor and the button status is printed both:
  • on the Serial Channel (on Linux that's /dev/ttyACM0),
  • on the LCD display.
• When the board is not reading anything from the sound sensor (i.e. the button is not pushed down) then the red LED is switched on.

Sample output

On the Serial Channel /dev/ttyACM0

$ screen /dev/ttyACM0 9600
No reading!
No reading!
No reading!
Level: 343
Level: 434
Level: 433
Level: 433
Level: 433
Level: 435
No reading!
No reading!
No reading!
No reading!

Hardware items

As usual the Intel Edison with the Arduino Expansion Board.

All the items come from the Seeed Grove Starter Kit Plus:

• sound sensor (Grove SEN12945P),
• button (Grove COM22242P),
• red LED (Grove COM04054P),
• LCD RGB backlight (Grove 811004001).

Software

This small project has an external dependency to drive the LCD display behaviour. It comes from the Seeed GitHub account, on its website page there's more technical information about it. This rgb_lcd library has been added to this code base to get started quickly. To add the rgb_lcd library to your project you need to get the Arduino IDE to find your rgb_lcd.h and rgb_lcd.cpp files.

On the Arduino IDE:

1. Click on File > Preferences
2. then on the Sketchbook location you need to provide this current path where the files are along with the .ino file
3. then you need to close and open again the Arduino IDE.

Setup

As you can see from the pictures:

• the red LED is on the left,
• then there's the button,
• then there's the sound sensor,
• behind the first row there's the LCD,
• in the background you can see the Edison board.

When the button is not pushed then the red LED is on, the LCD background is red and no values are parsed from the sensor. 

When the button is pushed down then the red LED is off, the LCD background is green and the values parsed from the sensor are displayed both on the LCD display and on the Serial Channel.