Flowbits - rectangular blocks that can be connected together to form circuits.

(TODO: Better name?)

Basic concepts
Blocks

Powerblock
Sensor Block
General computation block
Part list (for general computation block):
Parts to be ordered from three sources, digikey, futurlec, and dealextreme + 3D printed case.  Maybe ponocos german partner for a lasercut top surface ~2€ /a when ordering 25.

Cost: 8.86 + case plastic, pcb etc -> ~10$(+)

TODO: LEDs need sources and sink capable of driving them, atmega only supports max 25-30mA per pin, and max 110mA total.

Need 4 sinks for
Need 6 sources for
7 darlington transistors sink
Single PNP transistor
We have two reels (~4k pcs) of PNP SMD transistors (100mA) at the lab.


Single NPN sink transistor
metal strip for holding magnets (thin copper?)
-> About $0.05 per source or sink -> + $0.5