diff --git a/control/json/triggers/signal.hpp b/control/json/triggers/signal.hpp
new file mode 100644
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+++ b/control/json/triggers/signal.hpp
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+/**
+ * Copyright © 2021 IBM Corporation
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+#pragma once
+
+#include "../manager.hpp"
+#include "action.hpp"
+
+#include <nlohmann/json.hpp>
+#include <sdbusplus/message.hpp>
+
+#include <functional>
+#include <memory>
+#include <unordered_map>
+#include <vector>
+
+namespace phosphor::fan::control::json::trigger::signal
+{
+
+using json = nlohmann::json;
+
+/**
+ * @brief Subscribe to a signal
+ *
+ * @param[in] match - Signal match string to subscribe to
+ * @param[in] pkg - Data package to attach to signal
+ * @param[in] mgr - Pointer to manager of the trigger
+ */
+void subscribe(const std::string& match, SignalPkg&& pkg,
+               std::function<bool(SignalPkg&)> isSameSig, Manager* mgr);
+
+/**
+ * @brief Subscribes to a propertiesChanged signal
+ *
+ * @param[in] mgr - Pointer to manager of the trigger
+ * @param[in] eventName - Name of event associated to the signal
+ * @param[in] action - Action to be run when signal is received
+ */
+void propertiesChanged(Manager* mgr, const std::string& eventName,
+                       std::unique_ptr<ActionBase>& action);
+
+// Match setup function for signals
+using SignalMatch = std::function<void(Manager*, const std::string&,
+                                       std::unique_ptr<ActionBase>& action)>;
+
+/* Supported signals to their corresponding match setup functions */
+static const std::unordered_map<std::string, SignalMatch> signals = {
+    {"properties_changed", propertiesChanged}};
+
+/**
+ * @brief Trigger to process an event after a signal is received
+ *
+ * @param[in] jsonObj - JSON object for the trigger
+ * @param[in] eventName - Name of event associated to the signal
+ * @param[in] mgr - Pointer to manager of the trigger
+ * @param[in] actions - Actions associated with the trigger
+ *
+ * When fan control starts (or restarts), all events with 'signal' triggers are
+ * subscribed to run its corresponding actions when a signal, per its
+ * configuration, is received.
+ */
+void triggerSignal(const json& jsonObj, const std::string& eventName,
+                   Manager* mgr,
+                   std::vector<std::unique_ptr<ActionBase>>& actions);
+
+} // namespace phosphor::fan::control::json::trigger::signal