From d87be975a582f003b268629f014a4d6fdd47ecf2 Mon Sep 17 00:00:00 2001
From: "W. Trevor King" <wking@drexel.edu>
Date: Thu, 15 Mar 2012 17:21:01 -0400
Subject: [PATCH] Add `default-temperature` option to AFMConfig.

---
 pyafm/afm.py    | 4 ++++
 pyafm/config.py | 5 +++++
 2 files changed, 9 insertions(+)

diff --git a/pyafm/afm.py b/pyafm/afm.py
index a68b772..cac6269 100644
--- a/pyafm/afm.py
+++ b/pyafm/afm.py
@@ -147,11 +147,14 @@ class AFM (object):
       device: /dev/ttyS0
       baudrate: 9600
       max-current: 0.0
+    fallback-temperature: 295.15
     far: 3e-05
 
     >>> pyafm.storage.save_afm(afm=afm, filename=filename)
     >>> pprint_HDF5(filename=filename)  # doctest: +REPORT_UDIFF
     /
+      <HDF5 dataset "fallback-temperature": shape (), type "<f8">
+        295.15
       <HDF5 dataset "far": shape (), type "<f8">
         3e-05
       <HDF5 dataset "main-axis": shape (), type "|S1">
@@ -314,6 +317,7 @@ class AFM (object):
         """
         if hasattr(self.temperature, 'get_temperature'):
             return self.temperature.get_temperature()
+        return self.config['default-temperature']
 
     def move_just_onto_surface(self, depth=-50e-9, setpoint=2,
                                min_slope_ratio=10, far=200, steps=20,
diff --git a/pyafm/config.py b/pyafm/config.py
index c3af39a..dca08a0 100644
--- a/pyafm/config.py
+++ b/pyafm/config.py
@@ -169,6 +169,11 @@ class AFMConfig (_config.Config):
             help='Configure the underlying temperature sensor.',
             config_class=TemperatureConfig,
             default=None),
+        _config.FloatSetting(
+            name='fallback-temperature',
+            help=('Temperature in Kelvin to use if no temperature sensor is '
+                  'configured.'),
+            default=295.15),
         _config.FloatSetting(
             name='far',
             help=('Approximate distance in meters to move away to get "far" '
-- 
2.26.2