diff --git a/wpilibc/Athena/include/DigitalSource.h b/wpilibc/Athena/include/DigitalSource.h
new file mode 100644
index 0000000..c716715
--- /dev/null
+++ b/wpilibc/Athena/include/DigitalSource.h
@@ -0,0 +1,27 @@
+/*----------------------------------------------------------------------------*/
+/* Copyright (c) FIRST 2008. All Rights Reserved.
+ */
+/* Open Source Software - may be modified and shared by FRC teams. The code   */
+/* must be accompanied by the FIRST BSD license file in $(WIND_BASE)/WPILib.  */
+/*----------------------------------------------------------------------------*/
+#pragma once
+
+#include "InterruptableSensorBase.h"
+
+/**
+ * DigitalSource Interface.
+ * The DigitalSource represents all the possible inputs for a counter or a
+ * quadrature encoder. The source may be
+ * either a digital input or an analog input. If the caller just provides a
+ * channel, then a digital input will be
+ * constructed and freed when finished for the source. The source can either be
+ * a digital input or analog trigger
+ * but not both.
+ */
+class DigitalSource : public InterruptableSensorBase {
+ public:
+  virtual ~DigitalSource() = default;
+  virtual uint32_t GetChannelForRouting() const = 0;
+  virtual uint32_t GetModuleForRouting() const = 0;
+  virtual bool GetAnalogTriggerForRouting() const = 0;
+};