if you want to send multiple data from the arduino to the processing sketch, the easyest way to doit (at least for me) is to send everything in the same message, and if you can add a timestamp better, something like this:
v&&i&&p&&pf&×tamp
where the “&&” are separators, so in the processing sketch you just need to split the message. the timestamp would be usefull if you want to make a graph of your data (the timestamp could be the amount of milliseconds from start of your arduino)