Parkin was released by Championship side Cardiff City last week and he said he had no doubts about the move, despite a drop of two divisions.
"The manager told me how he wants to take the club even further forward and sold the club to me," said the former Hull and Stoke striker. "As soon as I spoke to him, I knew this was where I wanted to come and play football.
"I'm 30 now and I want to play as much football as I possibly can. It's a new challenge for me. I've not played as much football as I would have wanted to in the last 18 months for one reason or another.
"I want to come here and contribute to a successful team. It's a club going forward and I want to be a part of that."
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