From 24b8a95340d79ad00157c261e0e3c9f92998439e Mon Sep 17 00:00:00 2001
From: Jonathan Swoboda <154711427+swoboda1337@users.noreply.github.com>
Date: Fri, 27 Mar 2026 17:24:15 -0400
Subject: [PATCH] [pid] Remove unused PIDSimulator class (#15247)

---
 esphome/components/pid/pid_autotuner.h |  1 -
 esphome/components/pid/pid_simulator.h | 77 --------------------------
 2 files changed, 78 deletions(-)
 delete mode 100644 esphome/components/pid/pid_simulator.h

diff --git a/esphome/components/pid/pid_autotuner.h b/esphome/components/pid/pid_autotuner.h
index 98dc02bcc44..1db9ca71385 100644
--- a/esphome/components/pid/pid_autotuner.h
+++ b/esphome/components/pid/pid_autotuner.h
@@ -3,7 +3,6 @@
 #include "esphome/core/component.h"
 #include "esphome/core/optional.h"
 #include "pid_controller.h"
-#include "pid_simulator.h"
 
 #include <vector>
 
diff --git a/esphome/components/pid/pid_simulator.h b/esphome/components/pid/pid_simulator.h
deleted file mode 100644
index 629784cea51..00000000000
--- a/esphome/components/pid/pid_simulator.h
+++ /dev/null
@@ -1,77 +0,0 @@
-#pragma once
-
-#include "esphome/core/component.h"
-#include "esphome/core/helpers.h"
-#include "esphome/components/sensor/sensor.h"
-#include "esphome/components/output/float_output.h"
-
-#include <vector>
-
-namespace esphome {
-namespace pid {
-
-class PIDSimulator : public PollingComponent, public output::FloatOutput {
- public:
-  PIDSimulator() : PollingComponent(1000) {}
-
-  float surface = 1;                     /// surface area in m²
-  float mass = 3;                        /// mass of simulated object in kg
-  float temperature = 21;                /// current temperature of object in °C
-  float efficiency = 0.98;               /// heating efficiency, 1 is 100% efficient
-  float thermal_conductivity = 15;       /// thermal conductivity of surface are in W/(m*K), here: steel
-  float specific_heat_capacity = 4.182;  /// specific heat capacity of mass in kJ/(kg*K), here: water
-  float heat_power = 500;                /// Heating power in W
-  float ambient_temperature = 20;        /// Ambient temperature in °C
-  float update_interval = 1;             /// The simulated updated interval in seconds
-  std::vector<float> delayed_temps;      /// storage of past temperatures for delaying temperature reading
-  size_t delay_cycles = 15;              /// how many update cycles to delay the output
-  float output_value = 0.0;              /// Current output value of heating element
-  sensor::Sensor *sensor = new sensor::Sensor();
-
-  float delta_t(float power) {
-    // P = Q / t
-    // Q = c * m * 𝚫t
-    // 𝚫t = (P*t) / (c*m)
-    float c = this->specific_heat_capacity;
-    float t = this->update_interval;
-    float p = power / 1000;  //  in kW
-    float m = this->mass;
-    return (p * t) / (c * m);
-  }
-
-  float update_temp() {
-    float value = clamp(output_value, 0.0f, 1.0f);
-
-    // Heat
-    float power = value * heat_power * efficiency;
-    temperature += this->delta_t(power);
-
-    // Cool
-    // Q = k_w * A * (T_mass - T_ambient)
-    // P = Q / t
-    float dt = temperature - ambient_temperature;
-    float cool_power = (thermal_conductivity * surface * dt) / update_interval;
-    temperature -= this->delta_t(cool_power);
-
-    // Delay temperature readings
-    delayed_temps.push_back(temperature);
-    if (delayed_temps.size() > delay_cycles)
-      delayed_temps.erase(delayed_temps.begin());
-    float prev_temp = this->delayed_temps[0];
-    float alpha = 0.1f;
-    float ret = (1 - alpha) * prev_temp + alpha * temperature;
-    return ret;
-  }
-
-  void setup() override { sensor->publish_state(this->temperature); }
-  void update() override {
-    float new_temp = this->update_temp();
-    sensor->publish_state(new_temp);
-  }
-
- protected:
-  void write_state(float state) override { this->output_value = state; }
-};
-
-}  // namespace pid
-}  // namespace esphome