add read_temp_c to system + mqtt

src/publisher/pubMqtt.h

@@ -158,6 +158,7 @@ class PubMqtt {
             publish(subtopics[MQTT_UPTIME], mVal.data());
             publish(subtopics[MQTT_RSSI], String(WiFi.RSSI()).c_str());
             publish(subtopics[MQTT_FREE_HEAP], String(ESP.getFreeHeap()).c_str());
+            publish(subtopics[MQTT_TEMP_SENS_C], String(ah::readTemperature()).c_str());
             #ifndef ESP32
             publish(subtopics[MQTT_HEAP_FRAG], String(ESP.getHeapFragmentation()).c_str());
             #endif
@@ -656,7 +657,7 @@ class PubMqtt {
             size_t index;
             size_t total;
 
-            message_s() 
+            message_s()
             : topic { nullptr }
             , payload { nullptr }
             , len { 0 }

src/publisher/pubMqttDefs.h

@@ -56,7 +56,8 @@ enum {
     MQTT_STATUS,
     MQTT_LWT_ONLINE,
     MQTT_LWT_OFFLINE,
-    MQTT_ACK_PWR_LMT
+    MQTT_ACK_PWR_LMT,
+    MQTT_TEMP_SENS_C
 };
 
 const char* const subtopics[] PROGMEM = {

src/utils/helper.cpp

@@ -2,7 +2,7 @@
 // 2023 Ahoy, https://github.com/lumpapu/ahoy
 // Creative Commons - http://creativecommons.org/licenses/by-nc-sa/3.0/de/
 //-----------------------------------------------------------------------------
-
+#include <Arduino.h>
 #include "helper.h"
 #include "dbg.h"
 #include "../plugins/plugin_lang.h"
@@ -142,4 +142,19 @@ namespace ah {
         }
         DBGPRINTLN("");
     }
+    float readTemperature() {
+        /*// ADC1 channel 0 is GPIO36
+        adc1_config_width(ADC_WIDTH_BIT_12);
+        adc1_config_channel_atten(ADC1_CHANNEL_0, ADC_ATTEN_DB_0);
+        int adc_reading = adc1_get_raw(ADC1_CHANNEL_0);
+        // Convert the raw ADC reading to a voltage in mV
+        esp_adc_cal_characteristics_t characteristics;
+        esp_adc_cal_value_t val_type = esp_adc_cal_characterize(ADC_UNIT_1, ADC_ATTEN_DB_0, ADC_WIDTH_BIT_12, 1100, &characteristics);
+        uint32_t voltage = esp_adc_cal_raw_to_voltage(adc_reading, &characteristics);
+        // Convert the voltage to a temperature in Celsius
+        // This formula is an approximation and might need to be calibrated for your specific use case.
+        float temperature = (voltage - 500) / 10.0;*/
+
+        return temperatureRead();
+    }
 }

src/utils/helper.h

@@ -49,6 +49,8 @@ namespace ah {
     String getTimeStrMs(uint64_t t);
     uint64_t Serial2u64(const char *val);
     void dumpBuf(uint8_t buf[], uint8_t len, uint8_t firstRepl = 0, uint8_t lastRepl = 0);
+
+    float readTemperature();
 }
 
 #endif /*__HELPER_H__*/

src/web/RestApi.h

@@ -822,6 +822,8 @@ class RestApi {
         void getChipInfo(JsonObject obj) {
             obj[F("cpu_freq")]     = ESP.getCpuFreqMHz();
             obj[F("sdk")]          = ESP.getSdkVersion();
+            obj[F("temp_sensor_c")] = ah::readTemperature();
+
             #if defined(ESP32)
                 obj[F("revision")] = ESP.getChipRevision();
                 obj[F("model")]    = ESP.getChipModel();

src/web/html/system.html

@@ -44,7 +44,8 @@
                     tr("{#ENVIRONMENT}", obj.generic.env + " ({#BUILD_OPTIONS}: " + obj.generic.modules + ")"),
                     tr("Version", obj.generic.version + " - " + obj.generic.build),
                     tr("Chip", "CPU: " + obj.chip.cpu_freq + "MHz, " + obj.chip.cores + " Core(s)"),
-                    tr("Chip Model", obj.chip.model)
+                    tr("Chip Model", obj.chip.model),
+                    tr("Chip temp.", obj.chip.temp_sensor_c + "°C"),
                 ]
 
                 document.getElementById("info").append(