A list of some cool smartphone accessories with sensors:

  • SmidgION: Oxford Nanopore announce iPhone-powered sequencing
  • Lung cancer “breathalyzer” Smartphone-connected device can detect lung cancer early from a single breath.
  • Stratio’s device,LinkSquare, is a tiny spectrometer—a device that measures the intensity of wavelengths of light.
  • Sweat sensor for Real-Time Analysis of Body Chemistry
  • Using a smartphone camera di diagnose cancer.
  • You can even diagnose blood-borne parasites via a smartphone, article here
  • Qloudlab a smartphone accessory Sceptre that can perform blood tests
  • Bellabeat, an accessory to track a baby’s heart beat and movements
  • Wello health monitor from Azoi, a smart smartphone cover that measures heart rate, EGC, blood pressure, lung function, temperature, blood oxygen
  •  Portable Smartphone Fishfinding Sonar, FishHunter
  • ProScope Micro Mobile microscope for iOS devices
  • eMotion ECG, an Android-based continuous ECG monitor
  • Samsung GamePad, making the smartphone a gaming console
  • SmartCard, a smartphone accessory for testing cholesterol from Cornell University
  • Snooperscope, a smartphone camera accessory for night vision
  • Zepp sensors to improve your tennis, baseball, golf swings
  • Occipital 3D Sensor The Structure Sensor gives mobile devices the ability to capture and understand the world in three dimensions.
  • Peek Vision a smart-phone based system for comprehensive eye examinations
  • Beddit automatically tracks your sleeping patterns, heart rate, breathing, snoring, movements and environment
  • Illumoscope  an  iphone case with  built in macrophotography optics
  • Controlling UAV drones with an Android application and an external radio accessory
  • Salt meter from Thanko
  • SuperMechanical has created Range, and iGrill Inc is another smart thermometer for cooking but with Bluetooth
  • Tile, Stick-n-Find, Wallet Tracker, Location tracking of objects with Bluetooth Low Energy
  • Rijuven CardioSleeve smartphone enabled stethoscope
  • Pixie Scientific, smart diapers
  • Lumu Labs created a light meter for iPhone
  • Galvanic  created PIP Is A Bluetooth Biosensor That Aims To Use Your Phone To Gamify Beating Stress
  • Motes from Wimoto, tiny, rugged, wireless sensors. They talk directly to your Bluetooth SMART enabled devices.
  • Thalmic Labs Myo, UI innovations
  • Tagg the pettracker; Whistle and Fitbark a fitbit for your dog
  • Kwikset kevo, Goji, Lockitron, lockers controlled with a smartphone using Bluetooth LE
  • Safecast and  bGeigie Nano Kit, Do-Ra , Lapka to detect radiation
  • Ginger.io a platform to collect and analyze sensor data
  • SkinVision, a smartphone app that detects changes in your skin’s health
  • University of Illinois at Urbana-Champaign researchers have developed a smartphone cradle that has optical components – lenses and filters – to detect toxins, proteins, bacteria, viruses and other molecules.
  • Scanadu Scout, the first Medical Tricorder A scanner packed with sensors designed to read your vital signs and send them wirelessly to your smartphone in a few seconds
  • Handyscope, a mobile connected dermatoscope
  • BodyGuardian Remote Monitoring System, by Preventice, is a wearable body sensor that tracks ECG,Heart rate Respiration rate, Activity
  • ChatPerf, a Japanese company, has created an accessory for iOS devices that puffs out a scent
  • MC10 wearable sensors that communicates with smartphones
  • Zen Sensor from Zinc Software, which clips to a user’s ear lobe to collect heart rate data. The Zen connects to an iPhone or iPad app to provide heart rate variability biofeedback. Similar to Inner Balance sensor from HeartMath.
  • AOptix StratusTM a solution for iPhone, that delivers fully integrated iris, face, fingerprint and voice biometric capabilities.
  • ThermoDock, GlucoDock and more by Medisana
  • MobiUS™ SP1 ultrasound system from Mobisante
  • The ds32a+ a digital Stethoscopes from Thinklabs
  •  SpiroSmart is a mobile phone based platform that allows for the analysis of common lung function measures
  • The Welch Allyn iExaminer allows you to capture pictures of the optic fundus and retinal nerve using your iPhone 4.
  • The NETRA-G, developed by Eyenetra
  • Asthmapolis, a sensors that wirelessly syncs with your smart phone using the phone’s built in Bluetooth technology.
  • Dash a Bluetooth LE dongle that connects to a car on On-Board Diagnostics (OBD) and transmits the data to a smartphone (also in this space Carvoyant, Automatic, Delphi)
  • a Bluetooth Golf swing analyzer, 3BaysGSA Pro
  • a minuscule device implanted just under the skin provides an immediate analysis of substances in the body, and a radio module transmits the results to a doctor over the cellular phone network. At EPFL.
  • Lomography Smartphone Film Scanner
  • breathalyzers: breathometeralcohoot, BACtrack, iBreathFloome
  • Thermodo, a temperature sensor for mobile devices, attaches to the audio jack
  • Smart Bluetooth 4.0 accessories from the Italian company +Plugg
  • CubeSensors, cubes that sense your indoor environment
  • iExaminer iPhone Adapter for Welch Allyn’s PanOptic Ophthalmoscope Cleared in U.S.
  • Tinkė an iPhone accessory that measures heart rate, blood oxygen level, respiratory rate, heart rate variability
  • CitySense, a smartphone accessory to monitor pollution
  • smARtPULSE is a hackable Bluetooth LE oximeter, iSpO2 Pulse Oximeter, an iPhone, accessory to measure blood oxygen and pulse rate, Nonin launches a Bluetooth LE oximeter the Nonin 3230.
  • Withings Activity Tracker to monitor steps, heart rate, sleep
  • Withings Blood pressure monitor for iPhone
  • Your Android Phone Could Help Scientists Predict Your Weather, smartphones and barometric pressure sensors
  • Prexiso AG iC4, and Spike smartphone accessories with a laser to measure distance
  • Shaka, and Vaavud  wind meters for iPhone and Android
  • Cellscope an accessory for mobile disease diagnosis, at the moment ear infections, iPhone
  • Nest, the thermostat
  • Square, SumUp, iZettle, Payleven, Jusp to accept credit cards
  • Zeo, the sleep monitor
  • AliveCor ECG
  • AgaMatrix glucose meter, Glooko glucose monitor
  • iHealth  which is a subsidiary of China-based medical device company Andon Health, several devices, Glucose monitor, oximeter, blood pressure monitors
  • Athena GTX Wireless vital signs monitor, a single or multi-parameter vital signs monitor for EGG, noninvasive blood pressure (NIBP) and SpO2
  • OlloClipPhotojojo and Sony Cyber-shot QX10 camera lens