Look at page 7 of the manual. You need to connect the switch between com which is a positive voltage and the button, which will be a smaller voltage.Your schematic is showing you trying to do this as if you needed to connect to com which was a ground.You need first to measure the voltage on the com input with respect to ground.If this is 5V or less you need to use a PNP transistor with emitter to com and collector to your play pin.If this voltage is greater than 5V then you need an NPN transistor to drive the base of the PNP transistor up to this higher voltage first.
HiHave you considered using opto couplers as your switches?They would help isolate your Nano from the non gnd based input of the CSR module.Tom...
i wasnt able to measure any voltages form one of the pins to ground
Is there a general Rule why and when to use a specific Type of Transistor
I didn't say "one of the pins" I said the com pin.
Can you measure any voltage? Like the voltage between ground and the Vcc?
Play to GND aswell as Volume-Up to GND both where 0V and my multimeter wanted to switch to AC all the time. If i have the time i am going to hook the com port up on my oscilloscope relative to GND.
Sounds like the buttons are mulitplexed/scanned.