diff --git a/code/espurna/config/sensors.h b/code/espurna/config/sensors.h
index 4df614e4bc..bdd5b92022 100644
--- a/code/espurna/config/sensors.h
+++ b/code/espurna/config/sensors.h
@@ -646,6 +646,17 @@
 #define ADC_MODE_VALUE                  ADC_VCC
 #endif
 
+// custom Vcc mode (ADC_TOUT mode with correction)
+#define ADC_VCC_CUSTOM                  1
+
+#ifndef ADC_VCC_CUSTOM_MUL
+    #define ADC_VCC_CUSTOM_MUL          (1.0)
+#endif
+
+#ifndef ADC_VCC_CUSTOM_ADD
+    #define ADC_VCC_CUSTOM_ADD          (0.0)
+#endif
+
 // -----------------------------------------------------------------------------
 // I2C
 // -----------------------------------------------------------------------------
diff --git a/code/espurna/utils.ino b/code/espurna/utils.ino
index 2cc34d08ae..e06d2c8d55 100644
--- a/code/espurna/utils.ino
+++ b/code/espurna/utils.ino
@@ -137,9 +137,8 @@ void heartbeat() {
     if (serial) {
         DEBUG_MSG_P(PSTR("[MAIN] Uptime: %lu seconds\n"), uptime_seconds);
         DEBUG_MSG_P(PSTR("[MAIN] Free heap: %lu bytes\n"), free_heap);
-        #if ADC_MODE_VALUE == ADC_VCC
-            DEBUG_MSG_P(PSTR("[MAIN] Power: %lu mV\n"), ESP.getVcc());
-        #endif
+        int Vcc = custom_getVcc(ADC_MODE_VALUE);
+        DEBUG_MSG_P(PSTR("[MAIN] Power: %s \n"), (Vcc==(-1) ? "Unknown" : String(Vcc).c_str()));
         #if NTP_SUPPORT
             if (ntpSynced()) DEBUG_MSG_P(PSTR("[MAIN] Time: %s\n"), (char *) ntpDateTime().c_str());
         #endif
@@ -191,9 +190,8 @@ void heartbeat() {
                 lightMQTT();
             #endif
             #if (HEARTBEAT_REPORT_VCC)
-            #if ADC_MODE_VALUE == ADC_VCC
-                mqttSend(MQTT_TOPIC_VCC, String(ESP.getVcc()).c_str());
-            #endif
+                int Vcc = custom_getVcc(ADC_MODE_VALUE);
+                mqttSend(MQTT_TOPIC_VCC, (Vcc==(-1) ? "Unknown" : String(Vcc).c_str()));
             #endif
             #if (HEARTBEAT_REPORT_STATUS)
                 mqttSend(MQTT_TOPIC_STATUS, MQTT_STATUS_ONLINE, true);
@@ -332,9 +330,8 @@ void info() {
 
     DEBUG_MSG_P(PSTR("[INIT] Settings size: %u bytes\n"), settingsSize());
     DEBUG_MSG_P(PSTR("[INIT] Free heap: %u bytes\n"), getFreeHeap());
-    #if ADC_MODE_VALUE == ADC_VCC
-        DEBUG_MSG_P(PSTR("[INIT] Power: %u mV\n"), ESP.getVcc());
-    #endif
+    int Vcc = custom_getVcc(ADC_MODE_VALUE);
+    DEBUG_MSG_P(PSTR("[MAIN] Power: %s \n"), (Vcc==(-1) ? "Unknown" : String(Vcc).c_str()));
 
     DEBUG_MSG_P(PSTR("[INIT] Power saving delay value: %lu ms\n"), systemLoopDelay());
 
@@ -437,10 +434,22 @@ void nice_delay(unsigned long ms) {
 }
 
 // This method is called by the SDK to know where to connect the ADC
+// poulch74: add custom Vcc (see #define ADC_VCC_CUSTOM)
 int __get_adc_mode() {
-    return (int) (ADC_MODE_VALUE);
+    return (int) ((ADC_MODE_VALUE==ADC_VCC_CUSTOM) ? ADC_TOUT:ADC_MODE_VALUE);
 }
 
+int custom_getVcc(int mode) {
+    if(mode == ADC_VCC_CUSTOM) {
+        double vcc = analogRead(0)*ADC_VCC_CUSTOM_MUL+ADC_VCC_CUSTOM_ADD;
+        if(vcc < 0) vcc = 0;
+        return (int)vcc;
+    }
+    if(mode == ADC_VCC) return ESP.getVcc();
+    return -1;// decode for string as Unknown
+}
+
+
 bool isNumber(const char * s) {
     unsigned char len = strlen(s);
     bool decimal = false;
diff --git a/code/espurna/ws.ino b/code/espurna/ws.ino
index aab9be2ef2..9e51a45bcd 100644
--- a/code/espurna/ws.ino
+++ b/code/espurna/ws.ino
@@ -284,8 +284,8 @@ void _wsUpdate(JsonObject& root) {
     root["uptime"] = getUptime();
     root["rssi"] = WiFi.RSSI();
     root["loadaverage"] = systemLoadAverage();
-    #if ADC_MODE_VALUE == ADC_VCC
-        root["vcc"] = ESP.getVcc();
+    #if ADC_MODE_VALUE == ADC_VCC || ADC_MODE_VALUE == ADC_VCC_CUSTOM
+        root["vcc"] = custom_getVcc(ADC_MODE_VALUE);
     #endif
     #if NTP_SUPPORT
         if (ntpSynced()) root["now"] = now();