Wired Jack Control For Android - Selfie Stick - Volume Control for Earphones

4 months ago 192
  • Description
  • Documents
  • BOM
  • Attachments
  • Members
  • Comments

Description

Modern earphones are not just (stereo) speakers, but they integrate a microphone and few buttons. All these components are available through a 4-pins 3.5mm plug (also known as TRRS). This schematic shows you how the microphone and buttons are connected through this connector. The common purpose of these buttons is music control, but in general, their behavior depends on the specific application. For example, if the smartphone camera is opened, the volume buttons can be used to shot photos. This idea is also the basis of popular selfie sticks.

As you can see in the schematic, the circuit is elementary, just some resistors and, of course, the buttons. Instead of the real microphone, you must add an equivalent resistor (>1000Ohm, according to Android Specs). Be careful to the values of the resistors, they are not the absolutes values, but the equivalent value read from the plug point-of-view. The full circuit specifications can be read from the [official Android documentation] (https://source.android.com/devices/accessories/headset/plug-headset-spec). It works only for Android since Apple devices require a custom circuitry to enable these functionalities.

You can also observe the circuit I used to create a single-button device to shot photos for a time-lapse of the 3D-printing process.

Documents

Wired Jack Control for Android

BOM

ID Designator Quantity
1 R1 1
2 RMIC 1
3 R3 1
4 R4 1
5 R7 1
6 R2 1
7 SW3,SW2,SW5,SW1,SW4 5
8 P1,P2 2
9 MIC1 1

Attachments

None
Success
The owner does not allow comments in this project now

Comments (0)

goToTop
你现在访问的是EasyEDA海外版,使用建立访问速度更快的国内版 https://lceda.cn(需要重新注册)
如果需要转移工程请在个人中心 - 工程 - 工程高级设置 - 下载工程,下载后在https://lceda.cn/editor 打开保存即可。
有问题联系QQ 3001956291 不再提醒
svg-battery svg-battery-wifi svg-books svg-more svg-paste svg-pencil svg-plant svg-ruler svg-share svg-user svg-logo-cn svg-double-arrow
We use cookies to offer you a better experience. Detailed information on the use of cookies on this website is provided in our Privacy Policy. By using this site, you consent to the use of our cookies.