diff --git a/buzzer/CMakeLists.txt b/buzzer/CMakeLists.txt
new file mode 100644
index 0000000..2fabe7d
--- /dev/null
+++ b/buzzer/CMakeLists.txt
@@ -0,0 +1,44 @@
+# Generated Cmake Pico project file
+
+cmake_minimum_required(VERSION 3.13)
+
+set(CMAKE_C_STANDARD 11)
+set(CMAKE_CXX_STANDARD 17)
+set(CMAKE_EXPORT_COMPILE_COMMANDS ON)
+
+# Pull in Raspberry Pi Pico SDK (must be before project)
+include($ENV{PICO_SDK_PATH}/external/pico_sdk_import.cmake)
+
+project(buzzer C CXX ASM)
+
+# force picotool executable path
+add_executable(picotool IMPORTED GLOBAL)
+set_target_properties(picotool PROPERTIES 
+	IMPORTED_LOCATION "$(PICOTOOL_PATH)/picotool"
+)
+
+# Initialise the Raspberry Pi Pico SDK
+pico_sdk_init()
+
+# Add executable. Default name is the project name, version 0.1
+
+add_executable(buzzer main.c )
+
+pico_set_program_name(buzzer "buzzer")
+pico_set_program_version(buzzer "0.1")
+
+# Modify the below lines to enable/disable output over UART/USB
+pico_enable_stdio_uart(buzzer 0)
+pico_enable_stdio_usb(buzzer 1)
+
+# Add the standard library to the build
+target_link_libraries(buzzer
+        pico_stdlib hardware_pwm)
+
+# Add the standard include files to the build
+target_include_directories(buzzer PRIVATE
+        ${CMAKE_CURRENT_LIST_DIR}
+)
+
+pico_add_extra_outputs(buzzer)
+
diff --git a/buzzer/main.c b/buzzer/main.c
new file mode 100644
index 0000000..0c6dd2e
--- /dev/null
+++ b/buzzer/main.c
@@ -0,0 +1,45 @@
+#include <pico/printf.h>
+#include <pico/stdlib.h>
+#include <hardware/pwm.h>
+
+#define GPIO_BUTTON 16
+#define GPIO_BUZZER 15
+#define NB_GPIO 2
+
+typedef struct gpio gpio;
+struct gpio {
+    size_t pin;
+    size_t direction;
+};
+
+static gpio GPIOS[2] = {
+    (gpio) {.pin = GPIO_BUZZER, .direction = GPIO_OUT},
+    (gpio) {
+        .pin = GPIO_BUTTON, .direction = GPIO_IN
+    }
+};
+
+void init_gpio() {
+    gpio_init(PICO_DEFAULT_LED_PIN);
+    gpio_set_dir(PICO_DEFAULT_LED_PIN, GPIO_OUT);
+
+    for (size_t i = 0; i < NB_GPIO; i++) {
+        gpio_init(GPIOS[i].pin);
+        gpio_set_dir(GPIOS[i].pin, GPIOS[i].direction);
+    }
+}
+
+int main() {
+    stdio_init_all();
+    init_gpio();
+
+    while (true) {
+        if (!gpio_get(GPIOS[1].pin)) {
+            gpio_put(PICO_DEFAULT_LED_PIN, true);
+            gpio_put(GPIOS[0].pin, true);
+            continue;
+        }
+        gpio_put(GPIOS[0].pin, false);
+        gpio_put(PICO_DEFAULT_LED_PIN, false);
+    }
+}