diff --git a/src/gpio.h b/src/gpio.h
index a152d67..dc12df8 100644
--- a/src/gpio.h
+++ b/src/gpio.h
@@ -6,18 +6,18 @@
 using namespace std;
 
 enum GPIO_MAP_PIN {
-	GPIO2  = 2,       GPIO14 = 14,
-	GPIO3  = 3,       GPIO15 = 15,
+	GPIO2  = 2,   GPIO14 = 14,
+	GPIO3  = 3,   GPIO15 = 15,
 	GPIO4  = 4,	  GPIO18 = 18,
-	GPIO17 = 17,      GPIO23 = 23,
-	GPIO27 = 27,      GPIO24 = 24,
-	GPIO22 = 22,      GPIO25 = 25,
-	GPIO10 = 10,      GPIO8  = 8,
-	GPIO9  = 9,       GPIO7  = 7,
-	GPIO11 = 11,      GPIO12 = 12,
-	GPIO5  = 5,       GPIO16 = 16,
-	GPIO6  = 6,       GPIO20 = 20,
-	GPIO13 = 13,      GPIO21 = 21,
+	GPIO17 = 17,  GPIO23 = 23,
+	GPIO27 = 27,  GPIO24 = 24,
+	GPIO22 = 22,  GPIO25 = 25,
+	GPIO10 = 10,  GPIO8  = 8,
+	GPIO9  = 9,   GPIO7  = 7,
+	GPIO11 = 11,  GPIO12 = 12,
+	GPIO5  = 5,   GPIO16 = 16,
+	GPIO6  = 6,   GPIO20 = 20,
+	GPIO13 = 13,  GPIO21 = 21,
 	GPIO19 = 19,
 	GPIO26 = 26,
 };
diff --git a/src/i2c.cpp b/src/i2c.cpp
index 46fc240..5e2fff2 100644
--- a/src/i2c.cpp
+++ b/src/i2c.cpp
@@ -4,6 +4,8 @@
 #include <linux/i2c-dev.h>
 #include <unistd.h>
 #include "i2c.h"
+#include <regex>
+#include <filesystem>
 
 I2c::I2c(const char * deviceName)
 {
@@ -129,3 +131,27 @@ uint16_t I2c::readBlock(uint8_t command, uint8_t size, uint8_t * data)
 	return result;
 }
 
+std::vector<std::pair<std::string, uint8_t>> I2c::getDevices(uint8_t start /*=0*/, uint8_t end /*128*/)
+{
+	std::vector<std::pair<std::string, uint8_t>> i2cDevices;
+	std::regex i2cPattern("/dev/i2c-\\d+");
+	for (const auto& entry : std::filesystem::directory_iterator("/dev")) {
+		std::string path = entry.path().string();
+		if (std::regex_match(path, i2cPattern)) {
+			int f = open(path.c_str(), O_RDWR);
+			if(f == -1) continue;
+			for(uint8_t address = 0; address <= end; ++address) {
+				int result = ioctl(f, I2C_SLAVE, address);
+				if(result == 0) {
+					int res = i2c_smbus_read_byte(f);
+					if (res >0)
+					{
+						i2cDevices.push_back(std::make_pair(path, address));
+					}
+				}
+			}
+			close(f);
+		}
+	}
+	return i2cDevices;
+}
diff --git a/src/i2c.h b/src/i2c.h
index 02ff786..ba73842 100644
--- a/src/i2c.h
+++ b/src/i2c.h
@@ -48,6 +48,9 @@ class I2c {
 			addressSet(address);
 			return tryReadByte(command);
 		}
+
+		static std::vector<std::pair<std::string, uint8_t>> getDevices(uint8_t start = 0, u_int8_t end = 128);
+
 	private:
 		int fd;
 };
diff --git a/src/led.h b/src/led.h
index 572bada..6e77d74 100644
--- a/src/led.h
+++ b/src/led.h
@@ -53,7 +53,7 @@ class LED {
 		  215,218,220,223,225,228,231,233,236,239,241,244,247,249,252,255 };
 	}
 
-	void setWS2801(int numLed, vector<ofColor> colors, int BRIGHTNESS){
+	void setWS2801(int numLed, vector<ofColor>& colors, int BRIGHTNESS){
 		int a;
                 uint8_t buffer0[1], buffer1[4];
                 srand(time(NULL));
@@ -105,7 +105,7 @@ class LED {
 		}
 	}
 
-	void setAPA102(int numLed, vector<ofColor> colors, int BRIGHTNESS){
+	void setAPA102(int numLed, vector<ofColor>& colors, int BRIGHTNESS){
 		int a;
                 uint8_t buffer0[1], buffer1[4];
                 srand(time(NULL));
diff --git a/src/ofxGPIO.h b/src/ofxGPIO.h
index 467dc03..3dcee60 100644
--- a/src/ofxGPIO.h
+++ b/src/ofxGPIO.h
@@ -47,12 +47,14 @@ using namespace LogHighLight;
 #include "mcp.h"
 #include "font.h"
 #include "readata.h"
+
 /* only openframeworks */
 #ifndef COMPILE_WITHOUT_OPENFRAMEWORKS 
 	#include "google_image.h"
 	#include "gpio_state.h"
 #endif
 /* end OF */
+
 /* core high level */
 #include "led.h"
 #include "oled.h"