From bad4a82292c3fc41357d7c1d7261a77a9e9377e4 Mon Sep 17 00:00:00 2001
From: Nikolay Khabarov <2xl@mail.ru>
Date: Sat, 24 Jun 2017 17:49:14 +0300
Subject: [PATCH] raise error if no thermistor connected

---
 cnc/sensors/thermistor.py | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/cnc/sensors/thermistor.py b/cnc/sensors/thermistor.py
index 93e8212..179de43 100644
--- a/cnc/sensors/thermistor.py
+++ b/cnc/sensors/thermistor.py
@@ -30,7 +30,11 @@ from __future__ import division
 import math
 import time
 
-import ads111x as adc
+try:
+    import ads111x as adc
+except ImportError:
+    print("---- ads111x is not detected ----")
+    adc = None
 
 CELSIUS_TO_KELVIN = 273.15
 
@@ -53,6 +57,8 @@ def get_temperature(channel):
     :param channel: ads111x channel.
     :return: temperature in Celsius
     """
+    if adc is None:
+        raise IOError("ads111x is not connected")
     v = adc.measure(channel)
     if v >= Vcc:
         raise IOError("Thermistor not connected")