diff --git a/pid/stepwisecontroller.hpp b/pid/stepwisecontroller.hpp
new file mode 100644
index 0000000..c3af1a1
--- /dev/null
+++ b/pid/stepwisecontroller.hpp
@@ -0,0 +1,52 @@
+#pragma once
+
+#include "controller.hpp"
+#include "ec/stepwise.hpp"
+#include "fan.hpp"
+
+#include <memory>
+#include <vector>
+
+class ZoneInterface;
+
+class StepwiseController : public Controller
+{
+  public:
+    static std::unique_ptr<Controller>
+        CreateStepwiseController(ZoneInterface* owner, const std::string& id,
+                                 const std::vector<std::string>& inputs,
+                                 const ec::StepwiseInfo& initial);
+
+    StepwiseController(const std::string& id,
+                       const std::vector<std::string>& inputs,
+                       ZoneInterface* owner) :
+        Controller(),
+        _owner(owner), _id(id), _inputs(inputs)
+    {
+    }
+
+    float input_proc(void) override;
+
+    void output_proc(float value) override;
+
+    void process(void) override;
+
+    std::string get_id(void)
+    {
+        return _id;
+    }
+
+    ec::StepwiseInfo& get_stepwise_info(void)
+    {
+        return _stepwise_info;
+    }
+
+  protected:
+    ZoneInterface* _owner;
+
+  private:
+    // parameters
+    ec::StepwiseInfo _stepwise_info;
+    std::string _id;
+    std::vector<std::string> _inputs;
+};