addresses #47

Author: brentru

Adafruit_Sensor.cpp

@@ -94,6 +94,9 @@ void Adafruit_Sensor::printSensorDetails(void) {
   case SENSOR_TYPE_PM100_ENV:
     Serial.print(F("Environmental Particulate Matter 100 (ppm)"));
     break;
+  case SENSOR_TYPE_GAS_RESISTANCE:
+    Serial.print(F("Gas Resistance (ohms)"));
+    break;
   }
 
   Serial.println();

Adafruit_Sensor.h

@@ -77,7 +77,8 @@ typedef enum {
   SENSOR_TYPE_PM100_STD = (25),
   SENSOR_TYPE_PM10_ENV = (26),
   SENSOR_TYPE_PM25_ENV = (27),
-  SENSOR_TYPE_PM100_ENV = (28)
+  SENSOR_TYPE_PM100_ENV = (28),
+  SENSOR_TYPE_GAS_RESISTANCE = (29),
 } sensors_type_t;
 
 /** struct sensors_vec_s is used to return a vector in a common format. */
@@ -163,8 +164,10 @@ typedef struct {
                         million (ppm) */
     float pm25_env;  /**< Environmental Particulate Matter 2.5 in parts per
                         million (ppm) */
-    float pm100_env; /**< EnvironmentalParticulate Matter 100 in parts per
+    float pm100_env; /**< Environmental Particulate Matter 100 in parts per
                         million (ppm) */
+    float gas_resistance;  /**< Proportional to the amount of VOC particles in
+                              the air (Ohms) */
     sensors_color_t color; /**< color in RGB component values */
   };                       ///< Union for the wide ranges of data we can carry
 } sensors_event_t;

README.md

@@ -85,7 +85,8 @@ typedef enum
   SENSOR_TYPE_PM100_STD             = (25),
   SENSOR_TYPE_PM10_ENV              = (26),
   SENSOR_TYPE_PM25_ENV              = (27),
-  SENSOR_TYPE_PM100_ENV             = (28)
+  SENSOR_TYPE_PM100_ENV             = (28),
+  SENSOR_TYPE_GAS_RESISTANCE        = (29)
 } sensors_type_t;
 ```
 
@@ -159,6 +160,7 @@ typedef struct
         float           pm10_env,
         float           pm25_env,
         float           pm100_env,
+        float           gas_resistance,
         sensors_color_t color;
     };
 } sensors_event_t;
@@ -204,14 +206,15 @@ A key part of the abstraction layer is the standardisation of values on SI units
 - **tvoc**: values are in **parts per billion** (ppb)
 - **voc_index**: values are an **index** from 1-500 with 100 being normal
 - **nox_index**: values are an **index** from 1-500 with 100 being normal
-- **CO2**: values are in **parts per million*** (ppm)
-- **eCO2**: values are in **parts per million*** (ppm)
-- **pm10_std**: values are in **parts per million*** (ppm)
-- **pm25_std**: values are in **parts per million*** (ppm)
-- **pm100_std**: values are in **parts per million*** (ppm)
-- **pm10_env**: values are in **parts per million*** (ppm)
-- **pm25_env**: values are in **parts per million*** (ppm)
-- **pm100_env**: values are in **parts per million*** (ppm)
+- **CO2**: values are in **parts per million** (ppm)
+- **eCO2**: values are in **parts per million** (ppm)
+- **pm10_std**: values are in **parts per million** (ppm)
+- **pm25_std**: values are in **parts per million** (ppm)
+- **pm100_std**: values are in **parts per million** (ppm)
+- **pm10_env**: values are in **parts per million** (ppm)
+- **pm25_env**: values are in **parts per million** (ppm)
+- **pm100_env**: values are in **parts per million** (ppm)
+- **gas_resistance**: values are in **ohms**
 
 ## The Unified Driver Abstraction Layer in Practice ##