Using TRS Audio Jack Switch

shivia · 7th August 2007, 07:27 AM

Hello,
I have a question about using a Tip switch on an audio jack. I want to determine when the user connects a headphone jack (or 3.5mm TRS connector) into the device. I am using a SJ-43515TS-SMT Audio Jack and a high(3.3V), low(0V) output needs to be sent to a microcontroller.

I cant figure out a way so that the ac sound wave doesn't couple back to the digital input.

This is the pinout:
Pin 1: Sleeve
Pin 2: Tip
Pin 3: Ring
Pin 4: Ring
Pin 5: Switch (connected to pin 2 when no plug inserted/open when plug is inserted)

Whats the most efficient way of completing this task?

sreten · 7th August 2007, 11:44 AM

Hi,

Connect a resistor (or voltage divider) to the ucontroller positive
supply and connect the other end to the input and pin5. Connect
pin2 to ground. Insertion of the plug (no internal connection pin2)
will allow the input to rise from ground to +ve.

/sreten.

7th August 2007, 07:27 AM	#1
shivia diyAudio Member Join Date: Jul 2007	Using TRS Audio Jack Switch Hello, I have a question about using a Tip switch on an audio jack. I want to determine when the user connects a headphone jack (or 3.5mm TRS connector) into the device. I am using a SJ-43515TS-SMT Audio Jack and a high(3.3V), low(0V) output needs to be sent to a microcontroller. I cant figure out a way so that the ac sound wave doesn't couple back to the digital input. This is the pinout: Pin 1: Sleeve Pin 2: Tip Pin 3: Ring Pin 4: Ring Pin 5: Switch (connected to pin 2 when no plug inserted/open when plug is inserted) Whats the most efficient way of completing this task?

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7th August 2007, 11:44 AM	#2
sreten diyAudio Member Join Date: Nov 2003 Location: Brighton UK	Hi, Connect a resistor (or voltage divider) to the ucontroller positive supply and connect the other end to the input and pin5. Connect pin2 to ground. Insertion of the plug (no internal connection pin2) will allow the input to rise from ground to +ve. /sreten.

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