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diff --git a/Marlin/src/HAL/LINUX/hardware/Heater.cpp b/Marlin/src/HAL/LINUX/hardware/Heater.cpp
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+++ b/Marlin/src/HAL/LINUX/hardware/Heater.cpp
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+/**
+ * Marlin 3D Printer Firmware
+ * Copyright (c) 2020 MarlinFirmware [https://github.com/MarlinFirmware/Marlin]
+ *
+ * Based on Sprinter and grbl.
+ * Copyright (c) 2011 Camiel Gubbels / Erik van der Zalm
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ *
+ */
+#ifdef __PLAT_LINUX__
+
+#include "Clock.h"
+#include <stdio.h>
+#include "../../../inc/MarlinConfig.h"
+
+#include "Heater.h"
+
+Heater::Heater(pin_t heater, pin_t adc) {
+  heater_state = 0;
+  room_temp_raw = 150;
+  last = Clock::micros();
+  heater_pin = heater;
+  adc_pin = adc;
+  heat = 0.0;
+}
+
+Heater::~Heater() {
+}
+
+void Heater::update() {
+  // crude pwm read and cruder heat simulation
+  auto now = Clock::micros();
+  double delta = (now - last);
+  if (delta > 1000 ) {
+    heater_state = pwmcap.update(0xFFFF * Gpio::pin_map[heater_pin].value);
+    last = now;
+    heat += (heater_state - heat) * (delta / 1000000000.0);
+
+    NOLESS(heat, room_temp_raw);
+    Gpio::pin_map[analogInputToDigitalPin(adc_pin)].value = 0xFFFF - (uint16_t)heat;
+  }
+}
+
+void Heater::interrupt(GpioEvent ev) {
+  // ununsed
+}
+
+#endif // __PLAT_LINUX__