diff --git a/interfaces.hpp b/interfaces.hpp
new file mode 100644
index 0000000..8e7fc0b
--- /dev/null
+++ b/interfaces.hpp
@@ -0,0 +1,57 @@
+#pragma once
+
+#include <chrono>
+
+
+struct ReadReturn {
+    double value;
+    std::chrono::high_resolution_clock::time_point updated;
+};
+
+
+/*
+ * A ReadInterface is a plug-in for the PluggableSensor and anyone implementing
+ * this basically is providing a way to read a sensor.
+ */
+class ReadInterface
+{
+    public:
+        ReadInterface() { }
+
+        virtual ~ReadInterface() { }
+
+        virtual ReadReturn read(void) = 0;
+};
+
+/*
+ * A WriteInterface is a plug-in for the PluggableSensor and anyone implementing
+ * this basically is providing a way to write a sensor.
+ */
+class WriteInterface
+{
+    public:
+        WriteInterface(int64_t min, int64_t max)
+            : _min(min),
+              _max(max)
+        { }
+
+        virtual ~WriteInterface() { }
+
+        virtual void write(double value) = 0;
+
+        /*
+         * All WriteInterfaces have min/max available in case they want to error
+         * check.
+         */
+        int64_t getMin(void)
+        {
+            return _min;
+        }
+        int64_t getMax(void)
+        {
+            return _max;
+        }
+    private:
+        int64_t _min;
+        int64_t _max;
+};