diff --git a/conf.hpp b/conf.hpp
new file mode 100644
index 0000000..ad8a1a9
--- /dev/null
+++ b/conf.hpp
@@ -0,0 +1,51 @@
+#pragma once
+
+#include <map>
+#include <string>
+#include <vector>
+
+#include "pid/ec/pid.hpp"
+
+
+/*
+ * General sensor structure used for configuration.
+ */
+struct sensor
+{
+    /* Used for listen if readpath is passive. */
+    std::string type;
+    /* Can be a sensor path or a dbus path. */
+    std::string readpath;
+    std::string writepath;
+    /* min/max values for writing a percentage or error checking. */
+    int64_t min;
+    int64_t max;
+    int64_t timeout;
+};
+
+/*
+ * Structure for holding the configuration of a PID.
+ */
+struct controller_info
+{
+    std::string type;                // fan or margin or temp?
+    std::vector<std::string> inputs; // one or more sensors.
+    float setpoint;                  // initial setpoint for thermal.
+    ec::pidinfo info;                // pid details
+};
+
+/*
+ * General zone structure used for configuration.  A zone is a list of PIDs
+ * and a set of configuration settings.  This structure gets filled out with
+ * the zone configuration settings and not the PID details.
+ */
+struct zone
+{
+    /* The minimum RPM value we would ever want. */
+    float minthermalrpm;
+
+    /* If the sensors are in fail-safe mode, this is the percentage to use. */
+    float failsafepercent;
+};
+
+using PIDConf = std::map<std::string, struct controller_info>;