ATtiny85 Development Board
August 2019
This project was made to be deliberately simple to be a guinea pig for DFM and analysing cost by exporting the BOM from digikey. The main constraint for design was to keep the board size as small as possible.
there isn't a whole lot to say about the layout or schematic of the board other than I wanted it to be plug and play with other i2c devices so I included 2 pullups on the board.
I managed to get 10 panels of 9 done for $8 AUD excluding shipping as it was combined with other orders 8~9c per board.
Using Digikey's BOM export I broke down cost of the parts at a volume of 25 units. Most of the information is what you would expect with the MCU and connectors taking up the bulk of the cost followed by the regulator and then the passives.