Thanks great news Mike. Getting rid of the batteries altogether is fantastic. Your boards will be the best available. All just depends on what the final price will be.
With most projects like this one it is nearly impossible to do any sort of costing as there are just too many variables. At the end of the day the actual cost to me really isn't relevant as I have to price to "meet the market". In most cases I have to order 1000pcs of a particular part so I need to outlay many hundreds of dollars to be able to buy one part that Jaycar might have for a couple of dollars. I do this to ensure that I have the parts that will fit into the boards that I have made. Homepin is a long term project.
The PCB's for the breakout board were delivered to my office this morning and look very nice:
