diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..3b277c8
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,272 @@
+### CLion+iml template
+# Covers JetBrains IDEs: IntelliJ, RubyMine, PhpStorm, AppCode, PyCharm, CLion, Android Studio, WebStorm and Rider
+# Reference: https://intellij-support.jetbrains.com/hc/en-us/articles/206544839
+
+# User-specific stuff
+.idea/**/workspace.xml
+.idea/**/tasks.xml
+.idea/**/usage.statistics.xml
+.idea/**/dictionaries
+.idea/**/shelf
+
+# AWS User-specific
+.idea/**/aws.xml
+
+# Generated files
+.idea/**/contentModel.xml
+
+# Sensitive or high-churn files
+.idea/**/dataSources/
+.idea/**/dataSources.ids
+.idea/**/dataSources.local.xml
+.idea/**/sqlDataSources.xml
+.idea/**/dynamic.xml
+.idea/**/uiDesigner.xml
+.idea/**/dbnavigator.xml
+
+# Gradle
+.idea/**/gradle.xml
+.idea/**/libraries
+
+# Gradle and Maven with auto-import
+# When using Gradle or Maven with auto-import, you should exclude module files,
+# since they will be recreated, and may cause churn.  Uncomment if using
+# auto-import.
+# .idea/artifacts
+# .idea/compiler.xml
+# .idea/jarRepositories.xml
+# .idea/modules.xml
+# .idea/*.iml
+# .idea/modules
+# *.iml
+# *.ipr
+
+# CMake
+cmake-build-*/
+
+# Mongo Explorer plugin
+.idea/**/mongoSettings.xml
+
+# File-based project format
+*.iws
+
+# IntelliJ
+out/
+
+# mpeltonen/sbt-idea plugin
+.idea_modules/
+
+# JIRA plugin
+atlassian-ide-plugin.xml
+
+# Cursive Clojure plugin
+.idea/replstate.xml
+
+# SonarLint plugin
+.idea/sonarlint/
+
+# Crashlytics plugin (for Android Studio and IntelliJ)
+com_crashlytics_export_strings.xml
+crashlytics.properties
+crashlytics-build.properties
+fabric.properties
+
+# Editor-based Rest Client
+.idea/httpRequests
+
+# Android studio 3.1+ serialized cache file
+.idea/caches/build_file_checksums.ser
+
+### C++ template
+# Prerequisites
+*.d
+
+# Compiled Object files
+*.slo
+*.lo
+*.o
+*.obj
+
+# Precompiled Headers
+*.gch
+*.pch
+
+# Compiled Dynamic libraries
+*.so
+*.dylib
+*.dll
+
+# Fortran module files
+*.mod
+*.smod
+
+# Compiled Static libraries
+*.lai
+*.la
+*.a
+*.lib
+
+# Executables
+*.exe
+*.out
+*.app
+
+### C template
+# Prerequisites
+
+# Object files
+*.ko
+*.elf
+
+# Linker output
+*.ilk
+*.map
+*.exp
+
+# Precompiled Headers
+
+# Libraries
+
+# Shared objects (inc. Windows DLLs)
+*.so.*
+
+# Executables
+*.i*86
+*.x86_64
+*.hex
+
+# Debug files
+*.dSYM/
+*.su
+*.idb
+*.pdb
+
+# Kernel Module Compile Results
+*.mod*
+*.cmd
+.tmp_versions/
+modules.order
+Module.symvers
+Mkfile.old
+dkms.conf
+
+### JetBrains template
+# Covers JetBrains IDEs: IntelliJ, RubyMine, PhpStorm, AppCode, PyCharm, CLion, Android Studio, WebStorm and Rider
+# Reference: https://intellij-support.jetbrains.com/hc/en-us/articles/206544839
+
+# User-specific stuff
+
+# AWS User-specific
+
+# Generated files
+
+# Sensitive or high-churn files
+
+# Gradle
+
+# Gradle and Maven with auto-import
+# When using Gradle or Maven with auto-import, you should exclude module files,
+# since they will be recreated, and may cause churn.  Uncomment if using
+# auto-import.
+# .idea/artifacts
+# .idea/compiler.xml
+# .idea/jarRepositories.xml
+# .idea/modules.xml
+# .idea/*.iml
+# .idea/modules
+# *.iml
+# *.ipr
+
+# CMake
+
+# Mongo Explorer plugin
+
+# File-based project format
+
+# IntelliJ
+
+# mpeltonen/sbt-idea plugin
+
+# JIRA plugin
+
+# Cursive Clojure plugin
+
+# SonarLint plugin
+
+# Crashlytics plugin (for Android Studio and IntelliJ)
+
+# Editor-based Rest Client
+
+# Android studio 3.1+ serialized cache file
+
+### CMake template
+CMakeLists.txt.user
+CMakeCache.txt
+CMakeFiles
+CMakeScripts
+Testing
+Makefile
+cmake_install.cmake
+install_manifest.txt
+compile_commands.json
+CTestTestfile.cmake
+_deps
+
+### Example user template template
+### Example user template
+
+# IntelliJ project files
+.idea
+*.iml
+out
+gen
+### CLion+all template
+# Covers JetBrains IDEs: IntelliJ, RubyMine, PhpStorm, AppCode, PyCharm, CLion, Android Studio, WebStorm and Rider
+# Reference: https://intellij-support.jetbrains.com/hc/en-us/articles/206544839
+
+# User-specific stuff
+
+# AWS User-specific
+
+# Generated files
+
+# Sensitive or high-churn files
+
+# Gradle
+
+# Gradle and Maven with auto-import
+# When using Gradle or Maven with auto-import, you should exclude module files,
+# since they will be recreated, and may cause churn.  Uncomment if using
+# auto-import.
+# .idea/artifacts
+# .idea/compiler.xml
+# .idea/jarRepositories.xml
+# .idea/modules.xml
+# .idea/*.iml
+# .idea/modules
+# *.iml
+# *.ipr
+
+# CMake
+
+# Mongo Explorer plugin
+
+# File-based project format
+
+# IntelliJ
+
+# mpeltonen/sbt-idea plugin
+
+# JIRA plugin
+
+# Cursive Clojure plugin
+
+# SonarLint plugin
+
+# Crashlytics plugin (for Android Studio and IntelliJ)
+
+# Editor-based Rest Client
+
+# Android studio 3.1+ serialized cache file
+
+*/build/*
\ No newline at end of file
diff --git a/lab_2/.gitignore b/lab_2/.gitignore
new file mode 100644
index 0000000..bf22391
--- /dev/null
+++ b/lab_2/.gitignore
@@ -0,0 +1,218 @@
+### CLion+iml template
+# Covers JetBrains IDEs: IntelliJ, RubyMine, PhpStorm, AppCode, PyCharm, CLion, Android Studio, WebStorm and Rider
+# Reference: https://intellij-support.jetbrains.com/hc/en-us/articles/206544839
+
+# User-specific stuff
+.idea/**/workspace.xml
+.idea/**/tasks.xml
+.idea/**/usage.statistics.xml
+.idea/**/dictionaries
+.idea/**/shelf
+
+# AWS User-specific
+.idea/**/aws.xml
+
+# Generated files
+.idea/**/contentModel.xml
+
+# Sensitive or high-churn files
+.idea/**/dataSources/
+.idea/**/dataSources.ids
+.idea/**/dataSources.local.xml
+.idea/**/sqlDataSources.xml
+.idea/**/dynamic.xml
+.idea/**/uiDesigner.xml
+.idea/**/dbnavigator.xml
+
+# Gradle
+.idea/**/gradle.xml
+.idea/**/libraries
+
+# Gradle and Maven with auto-import
+# When using Gradle or Maven with auto-import, you should exclude module files,
+# since they will be recreated, and may cause churn.  Uncomment if using
+# auto-import.
+# .idea/artifacts
+# .idea/compiler.xml
+# .idea/jarRepositories.xml
+# .idea/modules.xml
+# .idea/*.iml
+# .idea/modules
+# *.iml
+# *.ipr
+
+# CMake
+cmake-build-*/
+
+# Mongo Explorer plugin
+.idea/**/mongoSettings.xml
+
+# File-based project format
+*.iws
+
+# IntelliJ
+out/
+
+# mpeltonen/sbt-idea plugin
+.idea_modules/
+
+# JIRA plugin
+atlassian-ide-plugin.xml
+
+# Cursive Clojure plugin
+.idea/replstate.xml
+
+# SonarLint plugin
+.idea/sonarlint/
+
+# Crashlytics plugin (for Android Studio and IntelliJ)
+com_crashlytics_export_strings.xml
+crashlytics.properties
+crashlytics-build.properties
+fabric.properties
+
+# Editor-based Rest Client
+.idea/httpRequests
+
+# Android studio 3.1+ serialized cache file
+.idea/caches/build_file_checksums.ser
+
+### C++ template
+# Prerequisites
+*.d
+
+# Compiled Object files
+*.slo
+*.lo
+*.o
+*.obj
+
+# Precompiled Headers
+*.gch
+*.pch
+
+# Compiled Dynamic libraries
+*.so
+*.dylib
+*.dll
+
+# Fortran module files
+*.mod
+*.smod
+
+# Compiled Static libraries
+*.lai
+*.la
+*.a
+*.lib
+
+# Executables
+*.exe
+*.out
+*.app
+
+### C template
+# Prerequisites
+
+# Object files
+*.ko
+*.elf
+
+# Linker output
+*.ilk
+*.map
+*.exp
+
+# Precompiled Headers
+
+# Libraries
+
+# Shared objects (inc. Windows DLLs)
+*.so.*
+
+# Executables
+*.i*86
+*.x86_64
+*.hex
+
+# Debug files
+*.dSYM/
+*.su
+*.idb
+*.pdb
+
+# Kernel Module Compile Results
+*.mod*
+*.cmd
+.tmp_versions/
+modules.order
+Module.symvers
+Mkfile.old
+dkms.conf
+
+### JetBrains template
+# Covers JetBrains IDEs: IntelliJ, RubyMine, PhpStorm, AppCode, PyCharm, CLion, Android Studio, WebStorm and Rider
+# Reference: https://intellij-support.jetbrains.com/hc/en-us/articles/206544839
+
+# User-specific stuff
+
+# AWS User-specific
+
+# Generated files
+
+# Sensitive or high-churn files
+
+# Gradle
+
+# Gradle and Maven with auto-import
+# When using Gradle or Maven with auto-import, you should exclude module files,
+# since they will be recreated, and may cause churn.  Uncomment if using
+# auto-import.
+# .idea/artifacts
+# .idea/compiler.xml
+# .idea/jarRepositories.xml
+# .idea/modules.xml
+# .idea/*.iml
+# .idea/modules
+# *.iml
+# *.ipr
+
+# CMake
+
+# Mongo Explorer plugin
+
+# File-based project format
+
+# IntelliJ
+
+# mpeltonen/sbt-idea plugin
+
+# JIRA plugin
+
+# Cursive Clojure plugin
+
+# SonarLint plugin
+
+# Crashlytics plugin (for Android Studio and IntelliJ)
+
+# Editor-based Rest Client
+
+# Android studio 3.1+ serialized cache file
+
+### CMake template
+CMakeLists.txt.user
+CMakeCache.txt
+CMakeFiles
+CMakeScripts
+Testing
+Makefile
+cmake_install.cmake
+install_manifest.txt
+compile_commands.json
+CTestTestfile.cmake
+_deps
+
+### Ninja template
+.ninja_deps
+.ninja_log
+
diff --git a/lab_2/CMakeLists.txt b/lab_2/CMakeLists.txt
new file mode 100644
index 0000000..c3ca54b
--- /dev/null
+++ b/lab_2/CMakeLists.txt
@@ -0,0 +1,51 @@
+# Generated Cmake Pico project file
+
+cmake_minimum_required(VERSION 3.13)
+
+set(CMAKE_C_STANDARD 11)
+set(CMAKE_CXX_STANDARD 17)
+
+# Initialise pico_sdk from installed location
+# (note this can come from environment, CMake cache etc)
+set(PICO_SDK_PATH "/home/junwei/Documents/pico/pico-sdk")
+
+set(PICO_BOARD pico CACHE STRING "Board type")
+
+# Pull in Raspberry Pi Pico SDK (must be before project)
+include(pico_sdk_import.cmake)
+
+if (PICO_SDK_VERSION_STRING VERSION_LESS "1.4.0")
+  message(FATAL_ERROR "Raspberry Pi Pico SDK version 1.4.0 (or later) required. Your version is ${PICO_SDK_VERSION_STRING}")
+endif()
+
+project(lab_2 C CXX ASM)
+
+# Initialise the Raspberry Pi Pico SDK
+pico_sdk_init()
+
+# Add executable. Default name is the project name, version 0.1
+
+add_executable(lab_2 lab_2.c )
+
+pico_set_program_name(lab_2 "lab_2")
+pico_set_program_version(lab_2 "0.1")
+
+pico_enable_stdio_uart(lab_2 1)
+pico_enable_stdio_usb(lab_2 1)
+
+# Add the standard library to the build
+target_link_libraries(lab_2
+        pico_stdlib)
+
+# Add the standard include files to the build
+target_include_directories(lab_2 PRIVATE
+  ${CMAKE_CURRENT_LIST_DIR}
+  ${CMAKE_CURRENT_LIST_DIR}/.. # for our common lwipopts or any other standard includes, if required
+)
+
+# Add any user requested libraries
+target_link_libraries(lab_2 
+        )
+
+pico_add_extra_outputs(lab_2)
+
diff --git a/lab_2/lab_2.c b/lab_2/lab_2.c
new file mode 100644
index 0000000..458c333
--- /dev/null
+++ b/lab_2/lab_2.c
@@ -0,0 +1,88 @@
+/**
+ * Lab 2
+ * Note that this program would print out garbage for the first few characters
+ * received. It will work as intended after a few characters are received.
+ */
+
+#include <stdio.h>
+#include "pico/stdlib.h"
+
+#define UART_ID uart0
+#define BAUD_RATE 115200    // Baud rate of UART
+
+#define UART_TX_PIN 16      // GPIO for UART TX pin
+#define UART_RX_PIN 17      // GPIO for UART RX pin
+#define GPIO_PIN 15         // GPIO for pseudo button
+
+#define SLEEP_TIME 100     // For testing can use a smaller value
+                            // 1000ms is based on the lab requirements
+
+/**
+ * Sends a character through UART0 based on the state of GPIO15 (Pseudo button)
+ * @param uart_input  Pointer to a character to be sent through UART0 (Space optimisation)
+ * @return void       Prints the character in uart_receive()
+ */
+void uart_transmit(char *uart_input) {
+    if (gpio_get(GPIO_PIN)) {           // Active low
+        uart_putc(UART_ID, '1');
+    } else {                                // Active high
+        uart_putc(UART_ID, *uart_input);
+        *uart_input = (*uart_input - 'A' + 1) % 26 + 'A'; // Next character
+                                                          // Wrap around back to A
+    }
+}
+
+/**
+ * Receives a character through UART0 and prints it out
+ * Ideally, the buffer should be cleared after each read
+ * NOTE: Flipping bit 5 effectively converts a character to lowercase
+ * @param uart_output Pointer to a location to store the received character (Space optimisation)
+ * @return void       Character is read and printed
+ */
+void uart_receive(char *uart_output) {
+    if (uart_is_readable(UART_ID)) {
+        *uart_output = uart_getc(UART_ID);
+
+        if (*uart_output >= 'A' && *uart_output <= 'Z') {
+            *uart_output ^= (1 << 5);   // XOR with 32 to convert to lowercase
+                                        // This operation flips bit 5
+        } else if (*uart_output == '1') {
+            *uart_output = '2';         // If '1' is received, print '2'
+        }
+
+        printf("%c\n", *uart_output);
+    }
+}
+
+/**
+ * Initializes UART0 and GPIO pins
+ * @return void
+ */
+void pin_init() {
+    // UART init
+    uart_init(UART_ID, BAUD_RATE);
+    gpio_set_function(UART_TX_PIN, GPIO_FUNC_UART);
+    gpio_set_function(UART_RX_PIN, GPIO_FUNC_UART);
+
+    // Pseudo button init
+    gpio_set_dir(GPIO_PIN, GPIO_IN);
+}
+
+int main() {
+    stdio_init_all();
+    pin_init();
+
+    char uart_input = 'A'; // Initial value of A
+    char uart_output;      // To store received character
+
+    while (true) {
+        uart_transmit(&uart_input); // Pass by reference to change
+                                    // value of uart_input during transmission
+
+        uart_receive(&uart_output); // Pass by reference to change
+                                    // value of uart_output during reception
+
+        sleep_ms(SLEEP_TIME); // Sleep based on SLEEP_TIME
+    }
+
+}