https://gitter.im/tinkerman-cat/espurna?at=5f60e7f1f969413294e95370

buttons.diff

diff --git a/code/espurna/button.cpp b/code/espurna/button.cpp
index da8acc5b..fc9eb0dd 100644
--- a/code/espurna/button.cpp
+++ b/code/espurna/button.cpp
@@ -715,24 +715,35 @@ void buttonSetup() {

         _buttons.reserve(buttons);

-        // TODO: allow to change gpio pin type based on config?
-        #if (BUTTON_EVENTS_SOURCE == BUTTON_EVENTS_SOURCE_GENERIC)
-            using gpio_type = GpioPin;
-        #elif (BUTTON_EVENTS_SOURCE == BUTTON_EVENTS_SOURCE_MCP23S08)
-            using gpio_type = McpGpioPin;
-        #endif
-
-        for (unsigned char index = 0; index < ButtonsMax; ++index) {
-            const auto pin = getSetting({"btnGPIO", index}, _buttonPin(index));
-            #if (BUTTON_EVENTS_SOURCE == BUTTON_EVENTS_SOURCE_GENERIC)
+        auto choose = [](int type, unsigned char pin) {
+            switch (type) {
+            case BUTTON_EVENTS_SOURCE_GENERIC:
                 if (!gpioValid(pin)) {
                     break;
                 }
-            #elif (BUTTON_EVENTS_SOURCE == BUTTON_EVENTS_SOURCE_MCP23S08)
+                return std::shared_ptr<BasePin>(new GpioPin(pin));
+#if (BUTTON_EVENTS_SOURCE == BUTTON_EVENTS_SOURCE_MCP23S08)
+            case BUTTON_EVENTS_SOURCE_MCP23S08:
                 if (!mcpGpioValid(pin)) {
                     break;
                 }
-            #endif
+                return std::shared_ptr<BasePin>(new McpGpioPin(pin));
+#endif
+            default:
+                break;
+            }
+
+            return std::shared_ptr<BasePin>(nullptr);
+        };
+
+        for (unsigned char index = 0; index < ButtonsMax; ++index) {
+            const auto source = getSetting({"btnEvent", index}, _buttonEventsSource(index));
+            const auto pin = getSetting({"btnGPIO", index}, _buttonPin(index));
+
+            auto managed_pin = choose(source, pin);
+            if (!managed_pin) {
+                break;
+            }

             const auto relayID = getSetting({"btnRelay", index}, _buttonRelay(index));

@@ -756,7 +767,7 @@ void buttonSetup() {
             const auto config = _buttonConfig(index);

             _buttons.emplace_back(
-                std::make_shared<gpio_type>(pin), config,
+                managed_pin, config,
                 relayID, actions, delays
             );
         }
diff --git a/code/espurna/button_config.h b/code/espurna/button_config.h
index 2660c635..7e3afa71 100644
--- a/code/espurna/button_config.h
+++ b/code/espurna/button_config.h
@@ -230,3 +230,16 @@ constexpr const bool _buttonMqttRetain(unsigned char index) {
         (index == 7) ? (1 == BUTTON8_MQTT_RETAIN) : (1 == BUTTON_MQTT_RETAIN)
     );
 }
+
+constexpr const int _buttonEventsSource(unsigned char index) {
+    return (
+        (index == 0) ? (BUTTON1_EVENTS_SOURCE) :
+        (index == 1) ? (BUTTON2_EVENTS_SOURCE) :
+        (index == 2) ? (BUTTON3_EVENTS_SOURCE) :
+        (index == 3) ? (BUTTON4_EVENTS_SOURCE) :
+        (index == 4) ? (BUTTON5_EVENTS_SOURCE) :
+        (index == 5) ? (BUTTON6_EVENTS_SOURCE) :
+        (index == 6) ? (BUTTON7_EVENTS_SOURCE) :
+        (index == 7) ? (BUTTON8_EVENTS_SOURCE) : BUTTON_EVENTS_SOURCE_GENERIC
+    );
+}
diff --git a/code/espurna/config/defaults.h b/code/espurna/config/defaults.h
index 8c2e5adc..1763e806 100644
--- a/code/espurna/config/defaults.h
+++ b/code/espurna/config/defaults.h
@@ -397,6 +397,31 @@
 #define BUTTON8_MQTT_RETAIN    BUTTON_MQTT_RETAIN
 #endif

+#ifndef BUTTON1_EVENTS_SOURCE
+#define BUTTON1_EVENTS_SOURCE    BUTTON_EVENTS_SOURCE_GENERIC
+#endif
+#ifndef BUTTON2_EVENTS_SOURCE
+#define BUTTON2_EVENTS_SOURCE    BUTTON_EVENTS_SOURCE_GENERIC
+#endif
+#ifndef BUTTON3_EVENTS_SOURCE
+#define BUTTON3_EVENTS_SOURCE    BUTTON_EVENTS_SOURCE_GENERIC
+#endif
+#ifndef BUTTON4_EVENTS_SOURCE
+#define BUTTON4_EVENTS_SOURCE    BUTTON_EVENTS_SOURCE_GENERIC
+#endif
+#ifndef BUTTON5_EVENTS_SOURCE
+#define BUTTON5_EVENTS_SOURCE    BUTTON_EVENTS_SOURCE_GENERIC
+#endif
+#ifndef BUTTON6_EVENTS_SOURCE
+#define BUTTON6_EVENTS_SOURCE    BUTTON_EVENTS_SOURCE_GENERIC
+#endif
+#ifndef BUTTON7_EVENTS_SOURCE
+#define BUTTON7_EVENTS_SOURCE    BUTTON_EVENTS_SOURCE_GENERIC
+#endif
+#ifndef BUTTON8_EVENTS_SOURCE
+#define BUTTON8_EVENTS_SOURCE    BUTTON_EVENTS_SOURCE_GENERIC
+#endif