diff --git a/.github/workflows/ci_checks.yml b/.github/workflows/ci_checks.yml
index bb41e32..baa2a00 100644
--- a/.github/workflows/ci_checks.yml
+++ b/.github/workflows/ci_checks.yml
@@ -43,7 +43,7 @@ jobs:
       - uses: actions-rs/toolchain@v1
         with:
           toolchain: stable
-      - run: cargo test --target=x86_64-unknown-linux-gnu
+      - run: cargo test --lib --target=x86_64-unknown-linux-gnu
   linting:
     name: Linting
     runs-on: ubuntu-latest
diff --git a/Cargo.toml b/Cargo.toml
index 2c7d046..8ea83e6 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -23,10 +23,8 @@ pico = { git = "https://github.com/rp-rs/rp-hal", branch="main"}
 # pro_micro_rp2040 = { git = "https://github.com/rp-rs/rp-hal", branch="main"}
 
 # If you're not going to use a Board Support Package you'll need these:
-#rp2040-hal = { git = "https://github.com/rp-rs/rp-hal", branch="main", features=["rt"] }
-#rp2040-boot2 = { git = "https://github.com/rp-rs/rp2040-boot2-rs", branch="main" }
-
-
+# rp2040-hal = { git = "https://github.com/rp-rs/rp-hal", branch="main", features=["rt"] }
+# rp2040-boot2 = { git = "https://github.com/rp-rs/rp2040-boot2-rs", branch="main" }
 
 # cargo build/run
 [profile.dev]
diff --git a/src/lib.rs b/src/lib.rs
new file mode 100644
index 0000000..f37054e
--- /dev/null
+++ b/src/lib.rs
@@ -0,0 +1,20 @@
+//! # Library Code for the rp2040-project-template application
+//!
+//! Code in this file can be tested on the host with `cargo
+//! test --lib --target=<your PC's target>`
+
+#[cfg_attr(not(test), no_std)]
+
+/// LED on-period and off-period, in milliseconds
+pub const LED_DELAY_MS: u32 = 500;
+
+#[cfg(test)]
+mod test {
+	#[test]
+	fn it_works() {
+		let sum = 2 + 2;
+		assert_eq!(4, sum);
+	}
+}
+
+// End of file
\ No newline at end of file
diff --git a/src/main.rs b/src/main.rs
index c3c8b90..5157f03 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -59,9 +59,11 @@ fn main() -> ! {
     loop {
         info!("on!");
         led_pin.set_high().unwrap();
-        delay.delay_ms(500);
+        delay.delay_ms(rp2040_project_template::LED_DELAY_MS);
         info!("off!");
         led_pin.set_low().unwrap();
-        delay.delay_ms(500);
+        delay.delay_ms(rp2040_project_template::LED_DELAY_MS);
     }
 }
+
+// End of file
\ No newline at end of file