diff --git a/microbit/src/07-uart/Cargo.toml b/microbit/src/07-uart/Cargo.toml
index adb153b6..03ea9c6f 100644
--- a/microbit/src/07-uart/Cargo.toml
+++ b/microbit/src/07-uart/Cargo.toml
@@ -4,8 +4,15 @@ version = "0.1.0"
 authors = ["Henrik Böving <hargonix@gmail.com>"]
 edition = "2018"
 
+[dependencies.microbit-v2]
+version = "0.15.1"
+optional = true
+
+[dependencies.microbit]
+version = "0.15.1"
+optional = true
+
 [dependencies]
-microbit-v2 = "0.15.1"
 cortex-m = { version = "0.7.7", features = ["critical-section-single-core"] }
 cortex-m-rt = "0.7.0"
 rtt-target = "0.5.0"
@@ -15,3 +22,7 @@ heapless = "0.8.0"
 embedded-hal = "1.0.0"
 embedded-hal-nb = "1.0.0"
 embedded-io = "0.6.1"
+
+[features]
+v2 = ["microbit-v2"]
+v1 = ["microbit"]
\ No newline at end of file
diff --git a/microbit/src/07-uart/Embed.toml b/microbit/src/07-uart/Embed.toml
index 25598358..b2535bd9 100644
--- a/microbit/src/07-uart/Embed.toml
+++ b/microbit/src/07-uart/Embed.toml
@@ -1,5 +1,6 @@
 [default.general]
 chip = "nrf52833_xxAA" # uncomment this line for micro:bit V2
+# chip = "nrf51822_xxAA" # uncomment this line for micro:bit V1
 
 [default.reset]
 halt_afterwards = false
diff --git a/microbit/src/07-uart/src/main.rs b/microbit/src/07-uart/src/main.rs
index 9c02e760..8be62be5 100644
--- a/microbit/src/07-uart/src/main.rs
+++ b/microbit/src/07-uart/src/main.rs
@@ -1,18 +1,29 @@
 #![no_main]
 #![no_std]
 
-use core::fmt::Write;
 use cortex_m_rt::entry;
 use panic_rtt_target as _;
 use rtt_target::rtt_init_print;
 
+#[cfg(feature = "v1")]
 use microbit::{
+    hal::prelude::*,
+    hal::uart,
+    hal::uart::{Baudrate, Parity},
+};
+
+#[cfg(feature = "v2")]
+use microbit::{
+    hal::prelude::*,
     hal::uarte,
     hal::uarte::{Baudrate, Parity},
 };
 
-use embedded_hal_nb::serial::Write as _;
+#[cfg(feature = "v2")]
+use embedded_hal_nb::serial::Write;
+#[cfg(feature = "v2")]
 mod serial_setup;
+#[cfg(feature = "v2")]
 use serial_setup::UartePort;
 
 #[entry]
@@ -20,6 +31,7 @@ fn main() -> ! {
     rtt_init_print!();
     let board = microbit::Board::take().unwrap();
 
+    #[cfg(feature = "v1")]
     let mut serial = {
         let serial = uarte::Uarte::new(
             board.UARTE0,
@@ -30,8 +42,18 @@ fn main() -> ! {
         UartePort::new(serial)
     };
 
-    write!(serial, "The quick brown fox jumps over the lazy dog.\r\n").unwrap();
+    #[cfg(feature = "v2")]
+    let mut serial = {
+        let serial = uarte::Uarte::new(
+            board.UARTE0,
+            board.uart.into(),
+            Parity::EXCLUDED,
+            Baudrate::BAUD115200,
+        );
+        UartePort::new(serial)
+    };
 
+    nb::block!(serial.write(b'X')).unwrap();
     nb::block!(serial.flush()).unwrap();
 
     loop {}