A Unified Design of Consumer Electronics and Biological Assays — What do you get when you cross-fertilize a Fitbit™ step counter with ELISA? A wearable biosensor. I expect that for most readers, the stuff of biological engineering — DNA polymers, proteins, monosaccharides, cells — are rarely thought of in combination with the stuff of electronics engineering — capacitors, serial ports, MOSFETs, accelerometers. And for good reasons.