Load balancing in postgres master slave HA cluster

Hi , 

Any one has experience on working with HA proxy set up with Postgres Master Slave replication  . 

Query :  I would like to divert the Write requests to Master and all read requests to Slave server . 

To achieve that can I use HA proxy server ? If any one has already implemented the same . Please share me the steps . 

Or , 

Any other method can be used to achieve the same using freeware . 

Thanks 

Soumitra