The FreeStation Printed Circuit Boards (PCBs)
These are the basis of FreeStation logging and sensing designs but will be useful for any low cost microcontroller based sensor design.  If you are interested in low cost sensing, you will find these useful in your work.  They are not much more expensive than breadboard or protoboard and much more reliable and useful once you are past prototyping.  They are documented below and available from OSHPark.