From 1e9361572f8936059a3a990bd0ca58ea849cb915 Mon Sep 17 00:00:00 2001
From: Paul Riseborough <p_riseborough@live.com.au>
Date: Wed, 18 Oct 2017 10:58:23 +1100
Subject: [PATCH] sensors: Add parameter for flow sensor minimum range

---
 src/modules/sensors/sensor_params.c | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/src/modules/sensors/sensor_params.c b/src/modules/sensors/sensor_params.c
index 1378c297c0..d53a79265b 100644
--- a/src/modules/sensors/sensor_params.c
+++ b/src/modules/sensors/sensor_params.c
@@ -175,6 +175,15 @@ PARAM_DEFINE_INT32(SENS_BOARD_ROT, 0);
  */
 PARAM_DEFINE_INT32(SENS_FLOW_ROT, 6);
 
+/**
+ * Optical Flow minimum focus distance
+ *
+ * This parameter defines the minimum distance from ground required for the optical flow sensor to operate reliably. The sensor may be usable below this height, but accuracy will progressively reduce to loss of focus.
+ * *
+ * @group Sensor Calibration
+ */
+PARAM_DEFINE_FLOAT(SENS_FLOW_MINRNG, 0.7f);
+
 /**
  * Board rotation Y (Pitch) offset
  *