diff --git a/APL_Master/README.md b/APL_Master/README.md
index f7a9d96..66ab445 100644
--- a/APL_Master/README.md
+++ b/APL_Master/README.md
@@ -1 +1,13 @@
-# Architektoniczne perełki Lublina - Master
\ No newline at end of file
+# Architektoniczne perełki Lublina - Master
+
+## I2C
+Pins:
+ - SDA -> 21
+ - SCL -> 22
+
+Addresses:
+ - Slave 1 -> `0x08`
+ - Slave 2 -> `0x09`
+ - Slave 3 -> `0x0A`
+ - Slave 4 -> `0x0B`
+ - Slave 5 -> `0x0C`
\ No newline at end of file
diff --git a/APL_Master/platformio.ini b/APL_Master/platformio.ini
index 86818e0..e45e6ea 100644
--- a/APL_Master/platformio.ini
+++ b/APL_Master/platformio.ini
@@ -12,5 +12,6 @@
 platform = espressif32
 board = esp32dev
 framework = arduino
-
 monitor_speed = 115200
+
+lib_deps = fastled/FastLED@^3.10.3
diff --git a/APL_Master/src/main.cpp b/APL_Master/src/main.cpp
index 37a1561..9feee3d 100644
--- a/APL_Master/src/main.cpp
+++ b/APL_Master/src/main.cpp
@@ -1,11 +1,53 @@
 #include <Arduino.h>
+#include <Wire.h>
+#include <FastLED.h>
+
+#define SDA_PIN 21
+#define SCL_PIN 22
+
+#define SLAVE_ONE_ADDRESS 0x08
+#define SLAVE_TWO_ADDRESS 0x09
+#define SLAVE_THREE_ADDRESS 0x0A
+#define SLAVE_FOUR_ADDRESS 0x0B
+#define SLAVE_FIVE_ADDRESS 0x0C
+
+#define LED_DATA_PIN 5
+#define LED_COUNT 29
+#define BRIGHTNESS 64
+#define LED_TYPE WS2812B
+#define COLOR_ORDER GRB
+
+CRGB leds[LED_COUNT];
+
+const CRGB SUCCESS_COLOR = CRGB::Green;
+const CRGB ERROR_COLOR = CRGB::Red;
+
+void testLedStrip();
 
 void setup()
 {
+  Wire.begin(SDA_PIN, SCL_PIN);
   Serial.begin(115200);
+
+  // Initialize FastLED with the specified LED type, data pin, and LED count
+  FastLED.addLeds<LED_TYPE, LED_DATA_PIN, COLOR_ORDER>(leds, LED_COUNT).setCorrection(TypicalLEDStrip);
+  FastLED.setBrightness(BRIGHTNESS);
+  testLedStrip();
 }
 
 void loop()
 {
   // put your main code here, to run repeatedly:
 }
+
+void testLedStrip()
+{
+  // Test the LED strip by turning on each LED one by one
+  for (int i = 0; i < LED_COUNT; i++)
+  {
+    leds[i] = SUCCESS_COLOR; // Set the LED to green
+    FastLED.show();
+    delay(100);            // Wait for a short duration
+    leds[i] = CRGB::Black; // Turn off the LED
+  }
+}
\ No newline at end of file
diff --git a/APL_Slave_1/README.md b/APL_Slave_1/README.md
index 0a16a38..a59945c 100644
--- a/APL_Slave_1/README.md
+++ b/APL_Slave_1/README.md
@@ -1 +1,8 @@
 # Architektoniczne perełki Lublina - Slave 1
+
+## I2C 
+Pins:
+ - SDA -> 21
+ - SCL -> 22
+
+Address: 0x08
\ No newline at end of file
diff --git a/APL_Slave_1/src/main.cpp b/APL_Slave_1/src/main.cpp
index b1cef02..895c624 100644
--- a/APL_Slave_1/src/main.cpp
+++ b/APL_Slave_1/src/main.cpp
@@ -1,10 +1,29 @@
 #include <Arduino.h>
+#include <Wire.h>
+
+#define SDA_PIN 21
+#define SCL_PIN 22
+
+#define SLAVE_ADDRESS 0x08
+
+void requestEvent();
 
 void setup()
 {
   Serial.begin(115200);
+
+  Wire.begin(SDA_PIN, SCL_PIN, SLAVE_ADDRESS); // Initialize I2C with specified SDA and SCL pins
+
+  Wire.onRequest(requestEvent);
 }
 
 void loop()
 {
 }
+
+void requestEvent()
+{
+  // TODO: Send data to the master when requested
+  Serial.println("Master requested data from Slave.");
+  Wire.write("Hello from Slave!");
+}
\ No newline at end of file
diff --git a/APL_Slave_2/README.md b/APL_Slave_2/README.md
index 20462a5..cdb1853 100644
--- a/APL_Slave_2/README.md
+++ b/APL_Slave_2/README.md
@@ -1 +1,8 @@
-# Architektoniczne perełki Lublina - Slave 2
\ No newline at end of file
+# Architektoniczne perełki Lublina - Slave 2
+
+## I2C 
+Pins:
+ - SDA -> 21
+ - SCL -> 22
+
+Address: 0x09
\ No newline at end of file
diff --git a/APL_Slave_2/src/main.cpp b/APL_Slave_2/src/main.cpp
index 37a1561..9c79bed 100644
--- a/APL_Slave_2/src/main.cpp
+++ b/APL_Slave_2/src/main.cpp
@@ -1,11 +1,29 @@
 #include <Arduino.h>
+#include <Wire.h>
+
+#define SDA_PIN 21
+#define SCL_PIN 22
+
+#define SLAVE_ADDRESS 0x09
+
+void requestEvent();
 
 void setup()
 {
   Serial.begin(115200);
+
+  Wire.begin(SDA_PIN, SCL_PIN, SLAVE_ADDRESS); // Initialize I2C with specified SDA and SCL pins
+
+  Wire.onRequest(requestEvent);
 }
 
 void loop()
 {
-  // put your main code here, to run repeatedly:
 }
+
+void requestEvent()
+{
+  // TODO: Send data to the master when requested
+  Serial.println("Master requested data from Slave.");
+  Wire.write("Hello from Slave!");
+}
\ No newline at end of file
diff --git a/APL_Slave_3/README.md b/APL_Slave_3/README.md
index b88f3af..ca39350 100644
--- a/APL_Slave_3/README.md
+++ b/APL_Slave_3/README.md
@@ -1 +1,8 @@
-# Architektoniczne perełki Lublina - Slave 3
\ No newline at end of file
+# Architektoniczne perełki Lublina - Slave 3
+
+## I2C 
+Pins:
+ - SDA -> 21
+ - SCL -> 22
+
+Address: 0x0A
\ No newline at end of file
diff --git a/APL_Slave_3/src/main.cpp b/APL_Slave_3/src/main.cpp
index f76fc99..510f019 100644
--- a/APL_Slave_3/src/main.cpp
+++ b/APL_Slave_3/src/main.cpp
@@ -1,11 +1,29 @@
 #include <Arduino.h>
+#include <Wire.h>
+
+#define SDA_PIN 21
+#define SCL_PIN 22
+
+#define SLAVE_ADDRESS 0x0A
+
+void requestEvent();
 
 void setup()
 {
   Serial.begin(115200);
+
+  Wire.begin(SDA_PIN, SCL_PIN, SLAVE_ADDRESS); // Initialize I2C with specified SDA and SCL pins
+
+  Wire.onRequest(requestEvent);
 }
 
 void loop()
 {
-  // put your main code here, to run repeatedly:
+}
+
+void requestEvent()
+{
+  // TODO: Send data to the master when requested
+  Serial.println("Master requested data from Slave.");
+  Wire.write("Hello from Slave!");
 }
\ No newline at end of file
diff --git a/APL_Slave_4/README.md b/APL_Slave_4/README.md
index a90f8e7..8fd5c9b 100644
--- a/APL_Slave_4/README.md
+++ b/APL_Slave_4/README.md
@@ -1 +1,8 @@
-# Architektoniczne perełki Lublina - Slave 4
\ No newline at end of file
+# Architektoniczne perełki Lublina - Slave 4
+
+## I2C 
+Pins:
+ - SDA -> 21
+ - SCL -> 22
+
+Address: 0x0B
\ No newline at end of file
diff --git a/APL_Slave_4/src/main.cpp b/APL_Slave_4/src/main.cpp
index b1cef02..b2b60bf 100644
--- a/APL_Slave_4/src/main.cpp
+++ b/APL_Slave_4/src/main.cpp
@@ -1,10 +1,29 @@
 #include <Arduino.h>
+#include <Wire.h>
+
+#define SDA_PIN 21
+#define SCL_PIN 22
+
+#define SLAVE_ADDRESS 0x0B
+
+void requestEvent();
 
 void setup()
 {
   Serial.begin(115200);
+
+  Wire.begin(SDA_PIN, SCL_PIN, SLAVE_ADDRESS); // Initialize I2C with specified SDA and SCL pins
+
+  Wire.onRequest(requestEvent);
 }
 
 void loop()
 {
 }
+
+void requestEvent()
+{
+  // TODO: Send data to the master when requested
+  Serial.println("Master requested data from Slave.");
+  Wire.write("Hello from Slave!");
+}
\ No newline at end of file
diff --git a/APL_Slave_5/README.md b/APL_Slave_5/README.md
index 44d036d..2299fc1 100644
--- a/APL_Slave_5/README.md
+++ b/APL_Slave_5/README.md
@@ -1 +1,8 @@
-# Architektoniczne perełki Lublina - Slave 5
\ No newline at end of file
+# Architektoniczne perełki Lublina - Slave 5
+
+## I2C 
+Pins:
+ - SDA -> 21
+ - SCL -> 22
+
+Address: 0x0C
\ No newline at end of file
diff --git a/APL_Slave_5/src/main.cpp b/APL_Slave_5/src/main.cpp
index b1cef02..ef13d54 100644
--- a/APL_Slave_5/src/main.cpp
+++ b/APL_Slave_5/src/main.cpp
@@ -1,10 +1,29 @@
 #include <Arduino.h>
+#include <Wire.h>
+
+#define SDA_PIN 21
+#define SCL_PIN 22
+
+#define SLAVE_ADDRESS 0x0C
+
+void requestEvent();
 
 void setup()
 {
   Serial.begin(115200);
+
+  Wire.begin(SDA_PIN, SCL_PIN, SLAVE_ADDRESS); // Initialize I2C with specified SDA and SCL pins
+
+  Wire.onRequest(requestEvent);
 }
 
 void loop()
 {
 }
+
+void requestEvent()
+{
+  // TODO: Send data to the master when requested
+  Serial.println("Master requested data from Slave.");
+  Wire.write("Hello from Slave!");
+}
\ No newline at end of file