In this work the development of an autonomous, robust and wearable micro-fluidic platform capable of performing
on-line analysis of pH in sweat is discussed. Through the means of an optical detection system based on a surface
mount light emitting diode (smLED) and a photodiode as a detector, a wearable system was achieved in which realtime
monitoring of sweat pH can be performed during sport activity. We show how through systems engineering,
integrating miniaturised electrical components, and by improving the micro-fluidic chip characteristics, the
wearability, reliability and performance of a sweat analysis platform has been significantly improved.