Hi guys

Sorry for the weak title, but it is difficult for me to explain I have a wav/MP3-trigger that can play a sound when a pin is grounded. To access more sounds, one of the pins (that you ground to play a sound) has to be connected to one of the other pins (that can also be grounded to play a sound).

So, let's say I have two pins, 1 and 2. If I connect any of them to ground, their corresponding sound will play, sound 1 or sound 2. If pin 1 is connected to pin 2, sound 3 will play etc. (if pin 1 is connected to pin 3, sound 4 will play)

How do connect pin 1 to pin 2 with the output from a microcontroller? Should I use something like a transistor or TTL?

Thanks for reading!
Nicholas

 

There may be other methods available depending on what signals are on the pins but it is likely that you could use the CD4066 switch IC. This could make the connections between the pins.
To connect pins to ground you could use a MOSFET (2N7000) controlled by the uC.

http://www.google.co.uk/url?sa=t&rc.../cd4066b.pdf&usg=AOvVaw26gsYlyEXHdS6Zmut6RQRJ

 

1. Pin 1 or 2 connected to Gnd -- Play sound 1 or 2
2. Pin 1 connected to pin 2 -- Play sound 3.
3. Pin 1 connected to pin 3 -- Play sound 4.

CD4017, CD4066 Datasheet.

 

The way I read it, the MP3 wave player outputs a sound based on the binary value applied to the trigger inputs.
If that is the case, connect the trigger inputs to an output port of the MCU. In the idle state, all outputs are logic high.
Send a binary value (negated) to the port to trigger the desired sound.