diff --git a/receiver_module/receiver_module.ino b/receiver_module/receiver_module.ino
deleted file mode 100644
index bc80ee0..0000000
--- a/receiver_module/receiver_module.ino
+++ /dev/null
@@ -1,26 +0,0 @@
-#include <SPI.h>
-#include <nRF24L01.h>
-#include <RF24.h>
-RF24 radio(9, 8);                 // CE, CSN
-const byte address[6] = "00001";  //address through which two modules communicate
-
-
-void setup() {
-  while (!Serial)
-    ;
-  Serial.begin(9600);
-  Serial.println("#200 Reciever Init");
-  radio.begin();
-  radio.openReadingPipe(0, address);  //set the address
-  radio.startListening();             //Set module as receiver
-}
-
-
-void loop() {
-  //Read the data if available in buffer
-  if (radio.available()) {
-    char text[64] = { 0 };
-    radio.read(&text, sizeof(text));
-    Serial.println(text);
-  }
-}
diff --git a/sender/ISSUES.md b/sender/ISSUES.md
new file mode 100644
index 0000000..66a0347
--- /dev/null
+++ b/sender/ISSUES.md
@@ -0,0 +1,4 @@
+# Problems
+
+- Arduino Nano Couldn't power up the sd card reader, need to input 5V to micro SD card reader.
+- Couldn't make Arduino Nano work with nRF24 - maybe same issue
diff --git a/sender/README.md b/sender/README.md
new file mode 100644
index 0000000..89a56a8
--- /dev/null
+++ b/sender/README.md
@@ -0,0 +1,26 @@
+# Sender module
+
+## Stages of flight
+
+1. Preflight - Remove before flight button or smthing like that
+    - no communication, blocked parachute ejection, all systems down
+2. Ready - Signal from groundstation
+    - sys check (modules calibration, battery check, atd...), blocked parachute ejection, wait for launch pin removed, only send data, do not save them
+3. Launch - Removed pin from the rocket
+    - launch, all systems sending and saving data on sd card
+4. Apogee - Detected that rocket is in apogee with accelerometer
+    - parachute ejection, all systems working, gps check and height check
+5. Return - Rocket has no velocity
+    - all not needed systems shutdown/sleep, buzz on, gps sending location, battery check, turn off gyro and accelerometer
+
+## Modules
+
+- nRF24L01 - Communication with groundstation
+- SD card reader - Write all recieved data to the SD card
+- Buzzer - To find our rocket after launch
+- Servo motors - Ejection of parachute
+
+## Tasks
+
+- send signal of listening
+- wait for recieve
diff --git a/sender/sender_module_final.ino b/sender/sender_module_final.ino
new file mode 100644
index 0000000..8de22fe
--- /dev/null
+++ b/sender/sender_module_final.ino
@@ -0,0 +1,263 @@
+#include <SPI.h>
+#include <SD.h>
+#include <Servo.h>
+#include "Arduino_BMI270_BMM150.h"
+
+const int BUZZER_PIN = 2;
+const int SERVO_A_PIN = 7;
+const int CHIP_SELECT = 4;
+
+// Create objects for modules
+File dataFile;
+Servo A;
+
+// Flight stages
+enum FlightStage
+{
+  READY,
+  ARM,
+  ASCENT,
+  DESCENT,
+  LANDED
+};
+
+FlightStage current_stage = READY;
+
+void setup()
+{
+  // Initialize Serial
+  Serial.begin(115200);
+
+  //while (!Serial)
+  //  ;
+  //Serial.println("# Welcome to CobraV2");
+  delay(1000);
+
+  pinMode(BUZZER_PIN, OUTPUT);
+  digitalWrite(BUZZER_PIN, LOW);
+
+  A.attach(SERVO_A_PIN);
+  A.write(80);
+  // Start with preflight stage
+  current_stage = READY;
+
+  delay(1000);
+}
+
+void loop()
+{
+  switch (current_stage)
+  {
+  case READY:
+    ready_stage();
+    break;
+  case ARM:
+    arm_stage();
+    break;
+  case ASCENT:
+    ascent_stage();
+    break;
+  case DESCENT:
+    descent_stage();
+    break;
+  case LANDED:
+    landed_stage();
+    break;
+  }
+}
+
+void beep()
+{
+  digitalWrite(BUZZER_PIN, HIGH);
+  delay(1000);
+  digitalWrite(BUZZER_PIN, LOW);
+}
+
+void ready_stage()
+{
+  Serial.println("# READY stage");
+  analogWrite(LED_BUILTIN, HIGH);
+  beep();
+
+  if (!IMU.begin())
+  {
+    Serial.println("Failed to initialize IMU!");
+    while (1)
+      ;
+  }
+
+  // SD card
+  //if (!SD.begin(CHIP_SELECT))
+  //{
+  //  Serial.println("# Fail SD module init");
+  //}
+  //else
+  //{
+  //  Serial.println("# Success SD module init");
+  //}
+//
+  //if (SD.exists("data.txt"))
+  //{
+  //  Serial.println("# File exists");
+  //}
+  //else
+  //{
+  //  Serial.println("# File does not exist");
+  //  dataFile = SD.open("data.txt", FILE_WRITE);
+  //}
+//
+  //if (dataFile)
+  //{
+  //  Serial.println("# File opened");
+  //  dataFile.println("# CobraV2 flight data");
+  //}
+  //else
+  //{
+  //  Serial.println("# Error opening file");
+  //}
+
+  Serial.print("# Accelerometer sample rate = ");
+  Serial.print(IMU.accelerationSampleRate());
+  Serial.println(" Hz");
+
+  //dataFile.print("# Accelerometer sample rate = ");
+  //dataFile.println(IMU.accelerationSampleRate());
+  //dataFile.close();
+
+  current_stage = ARM;
+}
+
+void arm_stage()
+{
+  // System check
+  // Block parachute ejection
+  // Wait for launch pin removed
+  // Start sending data
+  Serial.println("# ARM stage");
+  beep();
+  beep();
+
+  // Accelerometer Gyroscope
+  int counter = 0;
+  float x, y, z;
+
+  bool toggle = false;
+  //dataFile = SD.open("data.txt", FILE_WRITE);
+  //dataFile.println("# ARM stage");
+  while (true)
+  {
+    if (IMU.accelerationAvailable())
+    {
+      IMU.readAcceleration(x, y, z);
+      Serial.print(x);
+      Serial.print(", ");
+      Serial.print(y);
+      Serial.print(", ");
+      Serial.println(z);
+
+
+      //dataFile.print(x);
+      //dataFile.print(" ");
+      //dataFile.print(y);
+      //dataFile.print(" ");
+      //dataFile.println(z);
+
+      if (x > 1)
+      {
+        Serial.println("# Launch Detect");
+        counter++;
+      }
+      else
+      {
+        counter = 0;
+      }
+    }
+
+    if (counter < 15)
+    {
+      Serial.println("# Launching");
+      //dataFile.println("# Launching");
+      break;
+    }
+
+    if (toggle)
+    {
+      digitalWrite(LED_BUILTIN, HIGH);
+    }
+    else
+    {
+      digitalWrite(LED_BUILTIN, LOW);
+    }
+    toggle = !toggle;
+  }
+
+  current_stage = ASCENT;
+  //dataFile.close();
+}
+
+void ascent_stage()
+{
+  Serial.println("# ASCENT Stage");
+  unsigned long StartTime = millis();
+  int FailOrientationCounter = 0;
+  //File dataFile = SD.open("data.txt", FILE_WRITE);
+  //dataFile.println("# ASCENT stage");
+  while (true)
+  {
+    unsigned long CurrentTime = millis();
+    unsigned long ElapsedTime = CurrentTime - StartTime;
+    Serial.println(ElapsedTime);
+
+    if (IMU.gyroscopeAvailable())
+    {
+      float x, y, z;
+      IMU.readGyroscope(x, y, z);
+    }
+
+    if ((ElapsedTime > 9000))
+    {
+      dataFile.println("# Apogee detected by time");
+      break;
+    }
+  }
+
+  current_stage = DESCENT;
+  //dataFile.close();
+}
+
+void descent_stage()
+{
+  Serial.println("# DESCENT stage");
+  //File dataFile = SD.open("data.txt", FILE_WRITE);
+  //dataFile.println("# DESCENT stage");
+  A.write(80);
+  delay(1000);
+  A.write(180);
+
+  Serial.println("# Parachute deployed");
+
+  unsigned long StartTime = millis();
+  while (true)
+  {
+    unsigned long CurrentTime = millis();
+    unsigned long ElapsedTime = CurrentTime - StartTime;
+
+    if (ElapsedTime > 300000)
+    {
+      //dataFile.println("# Landing detected");
+      break;
+    }
+  }
+  current_stage = LANDED;
+  //dataFile.close();
+}
+
+void landed_stage()
+{
+  while (true)
+  {
+    Serial.println("# LANDED stage");
+    beep();
+    delay(200);
+  }
+}
diff --git a/sender/shell.nix b/sender/shell.nix
new file mode 100644
index 0000000..b2c8741
--- /dev/null
+++ b/sender/shell.nix
@@ -0,0 +1,20 @@
+{
+  pkgs ? import <nixpkgs> { },
+}:
+pkgs.callPackage (
+  {
+    mkShell,
+    arduino,
+    arduino-cli,
+    arduino-ide
+  }:
+  mkShell {
+    strictDeps = true;
+    nativeBuildInputs = [
+      arduino
+      arduino-cli
+      arduino-ide
+    ];
+  }
+) { }
+