In their paper “Universal mobile electrochemical detector designed for use in resource-limited applications” in PNAS, Alex Nemiroski and his team describe a cool little device that “couples the most common forms of electrochemical analysis directly to “the cloud” using any mobile phone”. Their little tool doesn’t cost more than 30 bucks and builds upon the common Atmega328 8-bit micro controller (Arduino!). With their cleverly designed protocols they were able to measure “(i) glucose in the blood for personal health, (ii) trace heavy metals (lead, cadmium, and zinc) in water for in-field environmental monitoring, (iii) sodium in urine for clinical analysis, and (iv) a malarial antigen (Plasmodium falciparum histidine-rich protein 2) for clinical research”. They then send the analyzed data via any standard mobile phone by placing a phone call and playing a sequence of sounds that then get decoded and stored. Very nice indeed.