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Why 5 ports?
There are 2 unrelated reasons why 5 was the ideal number of ports for FlowIO. The first reason has to do with the fact that we have 5 fingers on the hand, and therefore a 5-port device is perfect for wearable applications that involve control or sensing of the fingers. The second reason is about the size. The width of microcontroller board is almost exactly the same as the width of the valve array. Thus, whether I have 5 or fewer ports will not result in a smaller device (unless a different microcontroller is used).
Fewer than 5 ports
The modular design of FlowIO makes it incredibly simple and easy to make a FlowIO with anywhere between 1 and 5 ports. Moreover, the fewer ports there are, the cheaper the device is to make!
More than 5 ports
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