diff --git a/examples/switches_to_led.rs b/examples/switches_to_led.rs
index e69de29..5727bca 100644
--- a/examples/switches_to_led.rs
+++ b/examples/switches_to_led.rs
@@ -0,0 +1,52 @@
+#![no_std]
+#![no_main]
+
+use panic_halt as _; // you can put a breakpoint on `rust_begin_unwind` to catch panics
+
+use cortex_m_rt::entry;
+use driver_and_task_library::{
+    setup_board, Function, Pin, Port, PortOptions, ReadablePinOptions, WritablePinOptions, H, L,
+};
+
+#[entry]
+fn main() -> ! {
+    let board = setup_board();
+    let port_f = board.setup_gpio_port(Port::F, PortOptions);
+
+    let switches = port_f.setup_readable_pins(
+        [Pin::Zero, Pin::Four],
+        ReadablePinOptions {
+            function: Function::Digital,
+            pull_up: Some(true),
+        },
+    );
+    let [_sw1, _sw2] = switches.pins();
+
+    let mut rgb_led = port_f.setup_writable_pins(
+        [Pin::One, Pin::Three, Pin::Two],
+        WritablePinOptions {
+            function: Function::Digital,
+        },
+    );
+
+    let white = [H, H, H];
+    let _black = [L, L, L];
+
+    let red = [H, L, L];
+    let yellow = [H, H, L];
+    let green = [L, H, L];
+    let cyan = [L, H, H];
+    let blue = [L, L, H];
+    let magenta = [H, L, H];
+
+    let _rainbow = [red, yellow, green, cyan, blue, magenta];
+
+    loop {
+        match switches.read_all() {
+            [L, L] => rgb_led.write_all(white),
+            [L, H] => rgb_led.write_all(blue),
+            [H, L] => rgb_led.write_all(red),
+            [H, H] => rgb_led.write_all(green),
+        }
+    }
+}
diff --git a/src/lib/board.rs b/src/lib/board.rs
index 41f699c..aed7c9e 100644
--- a/src/lib/board.rs
+++ b/src/lib/board.rs
@@ -1,4 +1,4 @@
-use crate::gpio::ports::{Port, PortOptions, UsablePort, setup_gpio_port};
+use crate::gpio::ports::{setup_gpio_port, Port, PortOptions, UsablePort};
 
 pub struct UsableBoard;
 impl UsableBoard {
diff --git a/src/lib/gpio/pins.rs b/src/lib/gpio/pins.rs
index f35e070..3ee3053 100644
--- a/src/lib/gpio/pins.rs
+++ b/src/lib/gpio/pins.rs
@@ -298,7 +298,10 @@ pub fn setup_writable_pins<const N: usize>(
 
     let data_address = port.data(&pins);
 
-    let pins: [WritablePin; N] = pins.map(|pin| WritablePin { data_address, bit: pin });
+    let pins: [WritablePin; N] = pins.map(|pin| WritablePin {
+        data_address,
+        bit: pin,
+    });
 
     WritablePins { data_address, pins }
 }
diff --git a/src/lib/gpio/ports.rs b/src/lib/gpio/ports.rs
index 747a12c..6c02e81 100644
--- a/src/lib/gpio/ports.rs
+++ b/src/lib/gpio/ports.rs
@@ -1,5 +1,5 @@
 use crate::{
-    memory, Pin, ReadablePinOptions, ReadablePins, registers, WritablePinOptions, WritablePins,
+    memory, registers, Pin, ReadablePinOptions, ReadablePins, WritablePinOptions, WritablePins,
 };
 
 use super::pins::{setup_readable_pins, setup_writable_pins};
@@ -160,7 +160,7 @@ impl UsablePort {
     }
 }
 
-pub fn setup_gpio_port(port: Port, options: PortOptions) -> UsablePort {
+pub fn setup_gpio_port(port: Port, _options: PortOptions) -> UsablePort {
     unsafe {
         memory::set_bits(
             registers::system::RCGCGPIO,
diff --git a/src/lib/mod.rs b/src/lib/mod.rs
index 5f51e96..7d644f4 100644
--- a/src/lib/mod.rs
+++ b/src/lib/mod.rs
@@ -6,7 +6,10 @@ mod memory;
 mod registers;
 
 pub use board::setup_board;
-pub use gpio::pins::{Function, Pin, ReadablePin, ReadablePinOptions, ReadablePins, WritablePin, WritablePinOptions, WritablePins};
+pub use gpio::pins::{
+    Function, Pin, ReadablePin, ReadablePinOptions, ReadablePins, WritablePin, WritablePinOptions,
+    WritablePins,
+};
 pub use gpio::ports::{Port, PortOptions, UsablePort};
 
 pub const H: bool = true;
diff --git a/src/lib/registers.rs b/src/lib/registers.rs
index 471adfd..4a56908 100644
--- a/src/lib/registers.rs
+++ b/src/lib/registers.rs
@@ -13,4 +13,4 @@ pub mod system {
     pub const RCGCGPIO: *mut u32 = (BASE + 0x608) as *mut u32;
 }
 
-// TODO: delete this file
\ No newline at end of file
+// TODO: delete this file
diff --git a/src/main.rs b/src/main.rs
index 2f4fe30..5727bca 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -20,7 +20,7 @@ fn main() -> ! {
             pull_up: Some(true),
         },
     );
-    let [sw1, sw2] = switches.pins();
+    let [_sw1, _sw2] = switches.pins();
 
     let mut rgb_led = port_f.setup_writable_pins(
         [Pin::One, Pin::Three, Pin::Two],
@@ -30,7 +30,7 @@ fn main() -> ! {
     );
 
     let white = [H, H, H];
-    let black = [L, L, L];
+    let _black = [L, L, L];
 
     let red = [H, L, L];
     let yellow = [H, H, L];
@@ -39,7 +39,7 @@ fn main() -> ! {
     let blue = [L, L, H];
     let magenta = [H, L, H];
 
-    let rainbow = [red, yellow, green, cyan, blue, magenta];
+    let _rainbow = [red, yellow, green, cyan, blue, magenta];
 
     loop {
         match switches.read_all() {