You could add an external DAC but yeahhh.
And did you use the Mega before?
Can you try to connect it to GND and Vcc, what do you see then?
Be sure to match the program and the connection when you do 
You could add an external DAC but yeahhh.
And did you use the Mega before?
Can you try to connect it to GND and Vcc, what do you see then?
Be sure to match the program and the connection when you do