AudioDevices < Embedded_Systems

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---+ Audio Devices

The kit contains 4 audio devices:
   * 2 microphones with different size and sensitivity
   * an active and a passive buzzer
The microphones are mounted on the same PCB as the analog devices and the comparator can be used to switch on an alarm (including the green LED) when the noise level surpasses a threshold given by the potentiometer
| <img alt="smallMicro.png" height="358" src="%ATTACHURL%/smallMicro.png" title="smallMicro.png" width="172" /> | <img alt="bigMicro.png" height="374" src="%ATTACHURL%/bigMicro.png" title="bigMicro.png" width="157" /> |
| small microphone | big microphone |
The passive buzzer works like a load speaker and needs a frequency as input signal to work. Changing the frequency will change the pitch.

The active buzzer just needs a DC signal to work. This means that you just apply a DC level between S and - to make the active buzzer work while you must generate a frequency on the S pin of the passive one. "-" is connected to ground.

| <img alt="buzzer1.png" height="270" src="%ATTACHURL%/buzzer1.png" title="buzzer1.png" width="203" /> | <img alt="buzzer2.png" height="275" src="%ATTACHURL%/buzzer2.png" title="buzzer2.png" width="190" /> |
| active buzzer | passive buzzer |
-- %USERSIG{UliRaich - 2017-01-10}%

---++ Comments

%COMMENT%

Attachments

Topic attachments
I	Attachment	History	Action	Size	Date	Who	Comment
png	bigMicro.png	r1	manage	579.7 K	2017-01-10 - 20:29	UnknownUser	big microphone
png	buzzer1.png	r1	manage	800.8 K	2017-01-10 - 20:18	UnknownUser	active buzzer
png	buzzer2.png	r1	manage	835.6 K	2017-01-10 - 20:19	UnknownUser	passive buzzer
png	smallMicro.png	r1	manage	551.3 K	2017-01-10 - 20:33	UnknownUser	small microphone

Topic revision: r1 - 2017-01-10 - uli