Arduino object

Hi i was just wondering if anyone could help me with my project. I am trying to get my max patch to communicate with my arduino which i have got LDR's coming from which are giving off analogue readings from how intense the light is. My max patch is using waveform~ and i'm trying to get max to control the playback of the sample through the numbers from the analogue readings. Any idea about how i could do this? I have tried the serial communication tutorial but had no joy, any help would be greatly appreciated!