diff --git a/source/SensorManager.mc b/source/SensorManager.mc
new file mode 100644
index 0000000..1fd6131
--- /dev/null
+++ b/source/SensorManager.mc
@@ -0,0 +1,58 @@
+using Toybox.Activity;
+using Toybox.System;
+using Toybox.Lang;
+
+class SensorManager {
+
+    // -----------------------
+    // Static configuration
+    // -----------------------
+
+    // Use simulator mode by default
+    static var useSimulator = true;
+
+    // Simulated cadence value for testing
+    static var simulatedCadence = 0;
+
+    // -----------------------
+    // Public Methods
+    // -----------------------
+
+    // Set simulated cadence (for testing)
+    public static function setSimCadence(value) {
+        if (value == null || !(value instanceof Lang.Number)) {
+            System.println("[SensorManager] ERROR: simulated cadence must be a number");
+            return;
+        }
+
+        SensorManager.simulatedCadence = value;
+        System.println("[SensorManager] Simulated cadence set to: " + SensorManager.simulatedCadence.toString());
+    }
+
+    // Switch mode between simulator and real sensor
+    public static function setMode(simulator) {
+        // No strict type check needed
+        SensorManager.useSimulator = simulator ? true : false;
+        System.println("[SensorManager] Mode set to: " + (SensorManager.useSimulator ? "SIM" : "REAL"));
+    }
+
+    // Get current cadence
+    public static function getCadence() {
+        var cadence = 0;
+
+        if (SensorManager.useSimulator) {
+            cadence = SensorManager.simulatedCadence;
+            System.println("[SensorManager] Returning SIM cadence: " + cadence);
+        } else {
+            var info = Activity.getActivityInfo();
+            if (info != null && info.currentCadence != null) {
+                cadence = info.currentCadence;
+                System.println("[SensorManager] Returning REAL cadence: " + cadence);
+            } else {
+                System.println("[SensorManager] REAL cadence unavailable, returning 0");
+            }
+        }
+
+        return cadence;
+    }
+}
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