From 1c270d17a813838999c901a522043eab9fbf8cc4 Mon Sep 17 00:00:00 2001
From: Andrew Tridgell <andrew@tridgell.net>
Date: Fri, 6 Feb 2015 21:30:05 +1100
Subject: [PATCH] AP_Airspeed: ignore temperatures below -80

ETS driver on PX4 returns -1000
---
 libraries/AP_Airspeed/AP_Airspeed_PX4.cpp | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/libraries/AP_Airspeed/AP_Airspeed_PX4.cpp b/libraries/AP_Airspeed/AP_Airspeed_PX4.cpp
index cb6ffd9dfe..1442caf24d 100644
--- a/libraries/AP_Airspeed/AP_Airspeed_PX4.cpp
+++ b/libraries/AP_Airspeed/AP_Airspeed_PX4.cpp
@@ -76,6 +76,11 @@ bool AP_Airspeed_PX4::get_differential_pressure(float &pressure)
 // read the temperature
 bool AP_Airspeed_PX4::get_temperature(float &temperature)
 {
+    if (_temperature < -80) {
+        // almost certainly a bad reading. The ETS driver on PX4
+        // returns -1000
+        return false;
+    }
     temperature = _temperature;
     return true;
 }