doc: improve & complete documentation on many sensors

[contrib/upm.git] / src / gas / mq9.h

diff --git a/src/gas/mq9.h b/src/gas/mq9.h
index 9017c5b..67ede9e 100644 (file)
--- a/src/gas/mq9.h
+++ b/src/gas/mq9.h
@@ -31,7 +31,12 @@ namespace upm {
     /**
      * @brief C++ API for MQ9 gas sensor
      *
+     * The Grove MQ9 Gas Sensor module is useful for gas leakage detecting (in
+     * home and industry). It can detect Carbon Monoxide, Coal Gas and
+     * Liquefied Gas. It's sensitivty is 10-1000ppmCO 100-10000PPm Gas.
+     *
      * @snippet mq9-example.cxx Interesting
+     * @image html mq9.jpeg
      */
     class MQ9 : public Gas {
         public: