Feature: Show MCU temperature in system info

lib/CpuTemperature/src/CpuTemperature.cpp

@@ -0,0 +1,51 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Copyright (C) 2024 Thomas Basler and others
+ */
+
+#include "CpuTemperature.h"
+#include <Arduino.h>
+
+#if defined(CONFIG_IDF_TARGET_ESP32)
+// there is no official API available on the original ESP32
+extern "C" {
+uint8_t temprature_sens_read();
+}
+#elif defined(CONFIG_IDF_TARGET_ESP32C3) || defined(CONFIG_IDF_TARGET_ESP32S2) || defined(CONFIG_IDF_TARGET_ESP32S3)
+#include "driver/temp_sensor.h"
+#endif
+
+CpuTemperatureClass CpuTemperature;
+
+float CpuTemperatureClass::read()
+{
+    std::lock_guard<std::mutex> lock(_mutex);
+
+    float temperature = NAN;
+    bool success = false;
+
+#if defined(CONFIG_IDF_TARGET_ESP32)
+    uint8_t raw = temprature_sens_read();
+    ESP_LOGV(TAG, "Raw temperature value: %d", raw);
+    temperature = (raw - 32) / 1.8f;
+    success = (raw != 128);
+#elif defined(CONFIG_IDF_TARGET_ESP32C3) || defined(CONFIG_IDF_TARGET_ESP32S2) || defined(CONFIG_IDF_TARGET_ESP32S3)
+    temp_sensor_config_t tsens = TSENS_CONFIG_DEFAULT();
+    temp_sensor_set_config(tsens);
+    temp_sensor_start();
+#if defined(CONFIG_IDF_TARGET_ESP32S3) && (ESP_IDF_VERSION < ESP_IDF_VERSION_VAL(4, 4, 3))
+#error \
+    "ESP32-S3 internal temperature sensor requires ESP IDF V4.4.3 or higher. See https://github.com/esphome/issues/issues/4271"
+#endif
+    esp_err_t result = temp_sensor_read_celsius(&temperature);
+    temp_sensor_stop();
+    success = (result == ESP_OK);
+#endif
+
+    if (success && std::isfinite(temperature)) {
+        return temperature;
+    } else {
+        ESP_LOGD(TAG, "Ignoring invalid temperature (success=%d, value=%.1f)", success, temperature);
+        return NAN;
+    }
+}

lib/CpuTemperature/src/CpuTemperature.h

@@ -0,0 +1,14 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+#pragma once
+
+#include <mutex>
+
+class CpuTemperatureClass {
+public:
+    float read();
+
+private:
+    std::mutex _mutex;
+};
+
+extern CpuTemperatureClass CpuTemperature;

src/WebApi_sysstatus.cpp

@@ -7,11 +7,12 @@
 #include "NetworkSettings.h"
 #include "PinMapping.h"
 #include "WebApi.h"
+#include "__compiled_constants.h"
 #include <AsyncJson.h>
+#include <CpuTemperature.h>
 #include <Hoymiles.h>
 #include <LittleFS.h>
 #include <ResetReason.h>
-#include "__compiled_constants.h"
 
 void WebApiSysstatusClass::init(AsyncWebServer& server, Scheduler& scheduler)
 {
@@ -33,6 +34,7 @@ void WebApiSysstatusClass::onSystemStatus(AsyncWebServerRequest* request)
 
     root["sdkversion"] = ESP.getSdkVersion();
     root["cpufreq"] = ESP.getCpuFreqMHz();
+    root["cputemp"] = CpuTemperature.read();
 
     root["heap_total"] = ESP.getHeapSize();
     root["heap_used"] = ESP.getHeapSize() - ESP.getFreeHeap();

webapp/src/components/HardwareInfo.vue

@@ -19,6 +19,10 @@
                         <th>{{ $t('hardwareinfo.CpuFrequency') }}</th>
                         <td>{{ systemStatus.cpufreq }} {{ $t('hardwareinfo.Mhz') }}</td>
                     </tr>
+                    <tr>
+                        <th>{{ $t('hardwareinfo.CpuTemperature') }}</th>
+                        <td>{{ $n(systemStatus.cputemp, 'decimalNoDigits') }} {{ $t('hardwareinfo.DegreeC') }}</td>
+                    </tr>
                     <tr>
                         <th>{{ $t('hardwareinfo.FlashSize') }}</th>
                         <td>

webapp/src/locales/de.json

@@ -203,6 +203,8 @@
         "ChipCores": "Chip-Kerne",
         "CpuFrequency": "CPU-Frequenz",
         "Mhz": "MHz",
+        "CpuTemperature": "CPU Temperatur",
+        "DegreeC": "°C",
         "FlashSize": "Flash-Speichergröße",
         "Bytes": "Bytes",
         "MegaBytes": "MB"

webapp/src/locales/en.json

@@ -203,6 +203,8 @@
         "ChipCores": "Chip Cores",
         "CpuFrequency": "CPU Frequency",
         "Mhz": "MHz",
+        "CpuTemperature": "CPU Temperature",
+        "DegreeC": "°C",
         "FlashSize": "Flash Memory Size",
         "Bytes": "Bytes",
         "MegaBytes": "MB"

webapp/src/locales/fr.json

@@ -203,6 +203,8 @@
         "ChipCores": "Nombre de cœurs",
         "CpuFrequency": "Fréquence du CPU",
         "Mhz": "MHz",
+        "CpuTemperature": "CPU Temperature",
+        "DegreeC": "°C",
         "FlashSize": "Taille de la mémoire flash",
         "Bytes": "octets",
         "MegaBytes": "Mo"

webapp/src/types/SystemStatus.ts

@@ -4,6 +4,7 @@ export interface SystemStatus {
     chiprevision: number;
     chipcores: number;
     cpufreq: number;
+    cputemp: number;
     flashsize: number;
     // FirmwareInfo
     hostname: string;