Only let a spot in the middle activate the light

helpers.py

@@ -27,15 +27,37 @@ def is_max_larger_than(pixel_list, number):
  return max(pixel_list) > number
 
 
-def is_stationary_human(celsius_data):
+def convert_1d_to_2d(index_1d):
+ x = index_1d % 4
+ y = index_1d / 4
+ return x, y
+
+
+def is_in_the_middle(x, y):
+ return x in (1, 2) and y in (1, 2)
+
+
+def is_almost_equal(a, b, eps=0.05):
+ return abs(a - b) <= eps
+
+
+def is_human(celsius_data):
  max_temp = max(celsius_data)
  lowest_values = get_six_lowest_values(celsius_data)
  median_of_lowest_values = median(lowest_values)
  diff_median_max = max_temp - median_of_lowest_values
 
- result = diff_median_max >= 2.2
- #print 'is stationary human detected:', result
- return result
+ warm_enough = diff_median_max >= 2.2
+
+ should_activate = False # becomes true if warm enough in the middle
+ if warm_enough:
+ for i in xrange(len(celsius_data)):
+ if is_almost_equal(celsius_data[i], max_temp):
+ x, y = convert_1d_to_2d(i)
+ if is_in_the_middle(x, y):
+ should_activate = True
+ # print 'is human detected:', warm_enough
+ return warm_enough, should_activate
 
 
 def is_moving_human(celsius_data, previous_celsius_data):
@@ -47,9 +69,5 @@ def is_moving_human(celsius_data, previous_celsius_data):
  if max_abs_diff_between_frames >= 0.4:
  result = True
 
- #print 'is moving human detected:', result
+ # print 'is moving human detected:', result
  return result
-
-
-def get_frequency():
- return timedelta(seconds=2)

read_thermal.py

@@ -112,14 +112,14 @@ def tick(self):
  temperature_celsius = convert_two_bytes_to_celsius(first_byte, second_byte)
  celsius_data.append(temperature_celsius)
 
- stationary = is_stationary_human(celsius_data)
+ warm_enough, should_activate = is_human(celsius_data)
  moving = is_moving_human(celsius_data, self.previous_celsius_data)
  now = datetime.now()
 
- if stationary and not moving:
+ if warm_enough and should_activate and not moving:
  self.time_stationary_detected = now
  self.turn_light_on()
- elif stationary and self.time_stationary_detected >= now - timedelta(seconds=10):
+ elif warm_enough and self.time_stationary_detected >= now - timedelta(seconds=10):
  if self.current_light_level > 5:
  self.turn_light_on()
  else: