diff --git a/include/Protocol.h b/include/Protocol.h
index e8c7376..a40bec6 100644
--- a/include/Protocol.h
+++ b/include/Protocol.h
@@ -14,7 +14,7 @@ protected:
     ProtocolNo no;
 
 public:
-    Protocol(ProtocolNo protocol) : no(protocol) {}
+    explicit Protocol(ProtocolNo protocol) : no(protocol) {}
 
     Protocol& setProtocol(unsigned int p) {
         no = static_cast<ProtocolNo>(p);
diff --git a/include/RcDecoder.h b/include/RcDecoder.h
index fd2aa62..1d7286b 100644
--- a/include/RcDecoder.h
+++ b/include/RcDecoder.h
@@ -16,7 +16,7 @@ struct RcDecoder {
         }
 
         state = RC_STATE(res);
-        sprintf(group, "%05ld", RC_GROUP(res));
+        sprintf(group, "%05lu", RC_GROUP(res));
         switch (RC_DEVICE(res)) {
         case 0b10000:
             device = 1;
diff --git a/include/huzzah.h b/include/huzzah.h
index 19abaac..f74e3f6 100644
--- a/include/huzzah.h
+++ b/include/huzzah.h
@@ -75,11 +75,11 @@ namespace Board {
 
 	void parseSwitches(JsonDocument& jsonDoc) {
 		JsonObjectConst rcSwitch = jsonDoc["rcSwitch"];
-		switch ((unsigned int)rcSwitch["protocol"]) {
+		switch (static_cast<unsigned int>(rcSwitch["protocol"])) {
 		case 1: {
-			string id = Protocol_1::buildId((const char*)rcSwitch["group"], (int)rcSwitch["channel"]);
+			string id = Protocol_1::buildId(static_cast<const char*>(rcSwitch["group"]), static_cast<int>(rcSwitch["channel"]));
 			Ha::Switch* el = p1Switches[id];
-			if (el) el->updateState((bool)rcSwitch["state"]);
+			if (el) el->updateState(static_cast<bool>(rcSwitch["state"]));
 			break;
 		}
 		case 2:
diff --git a/lib/Tiny/Tiny.h b/lib/Tiny/Tiny.h
index 1c5e706..58f14b0 100644
--- a/lib/Tiny/Tiny.h
+++ b/lib/Tiny/Tiny.h
@@ -33,7 +33,7 @@ class SensorId {
 	char strValue[4];
 
 public:
-	SensorId(uint8_t id) {
+	explicit SensorId(uint8_t id) {
 		value = id;
         snprintf(strValue, 4, "%d", value);
 	}
diff --git a/platformio.ini b/platformio.ini
index f8264c8..8c108dc 100644
--- a/platformio.ini
+++ b/platformio.ini
@@ -21,9 +21,8 @@ lib_deps =
 	https://git.hodos.ro/libraries/serial-reader.git@^1.0.0
 build_flags = -D DEBUG_RAW=0
 check_tool = cppcheck
-check_flags = --enable=all
+check_flags = --enable=all cppcheck: --suppress=*:*/.pio/*
 check_skip_packages = yes
-check_severity = medium, high
 
 [env:huzzah]
 platform = espressif8266