compiles and run example

src/CMakeLists.txt

@@ -4,5 +4,9 @@ add_executable(emon main.cpp)
 # Pull in our pico_stdlib which aggregates commonly used features
 target_link_libraries(emon pico_stdlib)
 
+# enable usb output, disable uart output
+pico_enable_stdio_usb(emon 1)
+pico_enable_stdio_uart(emon 0)
+
 # create map/bin/hex/uf2 file etc.
 pico_add_extra_outputs(emon)