build is set up

relay/CMakeLists.txt

@@ -0,0 +1,19 @@
+cmake_minimum_required(VERSION 4.2)
+
+include(pico_sdk_import.cmake)
+
+project(relay C CXX ASM)
+set(CMAKE_C_STANDARD 11)
+set(CMAKE_CXX_STANDARD 17)
+
+set(PICO_EXAMPLES_PATH $(PROJECT_SOURCE_DIR))
+
+pico_sdk_init()
+
+add_executable(relay
+    main.c
+    )
+
+target_link_libraries(relay pico_stdlib)
+
+pico_add_extra_outputs(relay)