Added basic support for Lightware SF20/LW20 I2C connected LIDAR Devices

src/drivers/sf1xx/sf1xx.cpp

@@ -260,6 +260,13 @@ SF1XX::init()
 		_conversion_interval = 50000;
 		break;
 
+        case 5:
+                /* SF20/LW20 (100m 48-388Hz) */
+                _min_distance = 0.001f;
+                _max_distance = 100.0f;
+                _conversion_interval = 20834;
+                break;
+
 	default:
 		DEVICE_LOG("invalid HW model %d.", hw_model);
 		return ret;

src/modules/sensors/sensor_params.c

@@ -1098,17 +1098,18 @@ PARAM_DEFINE_INT32(SENS_EN_MB12XX, 0);
 PARAM_DEFINE_INT32(SENS_EN_TRONE, 0);
 
 /**
- * Lightware SF1xx laser rangefinder (i2c)
+ * Lightware SF1xx/SF20/LW20 laser rangefinder (i2c)
  *
  * @reboot_required true
  * @min 0
- * @max 4
+ * @max 5
  * @group Sensor Enable
  * @value 0 Disabled
  * @value 1 SF10/a
  * @value 2 SF10/b
  * @value 3 SF10/c
  * @value 4 SF11/c
+ * @value 5 SF/LW20
  */
 PARAM_DEFINE_INT32(SENS_EN_SF1XX, 0);