diff --git a/TODO b/TODO
index 0cbd1b6..5862964 100644
--- a/TODO
+++ b/TODO
@@ -1,6 +1,12 @@
+- Cleanups:
+
+  - Collect globals into a more coherent centralized namespace
+  - Cleanup debug handling using that centralized state info
+  - Cleanup timer run code into separate thread that gets started/stopped instead of always running with 0 displayed
+
+- Pull globals into a single coherent namespace
 - Autodetect temp probe device
 - Generate compensation tables at startup based on low/hi range - perhaps limited by times <400ms
-- Detect profile selection switch: Make sure it sets dimming properly
 - Add code repo to comments header
 - Speed up boot time by removing all unneeded boot activity
 - Write docs:
diff --git a/devtimer.py b/devtimer.py
index c228251..4912d41 100755
--- a/devtimer.py
+++ b/devtimer.py
@@ -187,6 +187,14 @@
 
         sleep(1)
 
+# Read the profile switch selector regularly
+
+def monitor_profile_sw():
+
+    while True:
+        Thread(name="GetProfile", target=read_profile_switch).start()
+        sleep(1)
+
 
 # Display current temperature
 # Negative temps are 2 digits, positive temps are 3 digits.
@@ -262,11 +270,6 @@
 
         beep(3, 0.1)  # Let user know we're starting/stopping
 
-        # If we are about to start running, determine selected profile
-
-        if not RUNNING:
-            read_profile_switch()
-
         # Reflect changed state and current time
 
         RUNNING = not RUNNING
@@ -369,9 +372,10 @@
     time_led = TM1637(TIME_CLK, TIME_DIO, DEFAULT_BRIGHTNESS - DIM_BY)
     temp_led = TM1637(TEMP_CLK, TEMP_DIO, DEFAULT_BRIGHTNESS - DIM_BY)
 
-    # Get initial profile in case we need to dim
+    # Start monitoring the profile selection switch.
+    # This allows the user to changes profiles during timer runs.
 
-    read_profile_switch()
+    Thread(name="MonitorProfileSW", target=monitor_profile_sw).start()
 
     # Get segment pattern for "F" - only need to do this once, not on every update
     FARENHEIGHT = temp_led.digit_to_segment[0x0f]