diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..567609b
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1 @@
+build/
diff --git a/Makefile b/Makefile
new file mode 100644
index 0000000..34f11be
--- /dev/null
+++ b/Makefile
@@ -0,0 +1,39 @@
+FQBN = Seeeduino:samd:seeed_XIAO_m0
+UF2_MOUNT = /mnt/chromeos/removable/Arduino
+ARDUINO_DIR = /app/Arduino
+BUILDER = flatpak run --command ${ARDUINO_DIR}/arduino-builder cc.arduino.arduinoide
+
+default: build/vail-adapter.ino.uf2
+install: build/vail-adapter.ino.uf2
+	./install.sh $< $(UF2_MOUNT) 
+
+# uf2conv.py is covered by an MIT license.
+build/uf2conv.py: build/uf2families.json
+	mkdir -p build
+	curl -L https://raw.githubusercontent.com/microsoft/uf2/master/utils/$(@F) > $@
+	chmod +x $@
+build/uf2families.json:
+	mkdir -p build
+	curl -L https://raw.githubusercontent.com/microsoft/uf2/master/utils/$(@F) > $@
+
+%.uf2: %.bin build/uf2conv.py
+	build/uf2conv.py -b 0x2000 -c -o $@ $<
+
+build/%.bin: % *.cpp *.h
+	arduino-builder \
+		-build-cache ~/.cache/arduino \
+		-build-path build \
+		-core-api-version 10813 \
+		-fqbn $(FQBN) \
+		-hardware ~/.arduino15/packages \
+		-tools $(ARDUINO_DIR)/tools-builder \
+		-tools ~/.arduino15/packages \
+		-hardware $(ARDUINO_DIR)/hardware \
+		-hardware ~/.arduino15/packages \
+		-built-in-libraries $(ARDUINO_DIR)/libraries \
+		-libraries ~/Arduino/libraries \
+		-compile \
+		$<
+	
+upload: vail-adapter.ino
+	arduino --upload --board $(FQBN) $<
diff --git a/README.adoc b/README.md
similarity index 62%
rename from README.adoc
rename to README.md
index e8b9fcc..0ad4a2b 100644
--- a/README.adoc
+++ b/README.md
@@ -1,32 +1,33 @@
-:Author: neale
-:Email: neale@woozle.org
-:Date: 2020-May-3
-:Revision: 1
-:License: MIT
+---
+Author: neale
+Email: neale@woozle.org
+License: MIT
+---
 
-= Project: USB Morse Adapter
+# Project: USB Morse Adapter
 
-image:https://lh3.googleusercontent.com/pw/ACtC-3d9xbLxL23QeLm-3gy3-Yt0VHE3IlQ-qyMDqTfdF6Bo7fHkkokACdIs68pmXevu14VzrrCeKj1JmRUiekUNiZe9J9rYIh_pTagvCbKSzpY8Ynp1m6cF4G_jTvtiU5eRtoNCsmU5OLy2SR9kYcCDYSt-AA=s1471-no["Vail adapter, assembled and connected",width=300,https://lh3.googleusercontent.com/pw/ACtC-3d9xbLxL23QeLm-3gy3-Yt0VHE3IlQ-qyMDqTfdF6Bo7fHkkokACdIs68pmXevu14VzrrCeKj1JmRUiekUNiZe9J9rYIh_pTagvCbKSzpY8Ynp1m6cF4G_jTvtiU5eRtoNCsmU5OLy2SR9kYcCDYSt-AA=s1471-no]
+![Vail adapter, assembled and connected](https://lh3.googleusercontent.com/pw/ACtC-3d9xbLxL23QeLm-3gy3-Yt0VHE3IlQ-qyMDqTfdF6Bo7fHkkokACdIs68pmXevu14VzrrCeKj1JmRUiekUNiZe9J9rYIh_pTagvCbKSzpY8Ynp1m6cF4G_jTvtiU5eRtoNCsmU5OLy2SR9kYcCDYSt-AA=s1471-no)
 
 This translates Morse key inputs into USB events,
 either MIDI or MIDI+Keyboard,
 so you can use a computer.
 
+It is fully compatible with [VBand](https://hamradio.solutions/vband/)
+and anything else that uses the VBand adapter.
+
 I use this with an Internet morse code repeater I wrote,
 available at https://vail.woozle.org/.
-It will also work with [VBand](https://hamradio.solutions/vband/),
-in MIDI+Keyboard mode.
 
 This project requires an Arduino that can send USB.
 The following should work:
 
-=== Verified Working
+### Verified Working
 
-* Seeeduino Xiao
+* Seeeduino Xiao **(recommended)**
 * Arduino Micro
 * KeeYees Pro Micro
 
-=== Unverified but should work
+### Unverified but should work
 
 Any USB-capable Arduino should be fine, including:
 
@@ -39,28 +40,30 @@ Any USB-capable Arduino should be fine, including:
 You might even be able to get a Digispark (attiny85) to work,
 but this may require a little hacking. Send me a patch, if you do!
 
-== Step 1: Installation
+## Step 1: Installation
 
-If Arduino Create still exists when you're reading this,
-you might be able to load up
-https://create.arduino.cc/editor/neale/f94bb765-47bd-4bc4-9cbf-b978f7124bdc[my project]
-and program your board without too much fuss.
+#### The Easy Way
 
-Otherwise you are going to need to install the MidiUSB and Keyboard libraries.
+I plan to begin releasing precompiled images for the Seeeduino XIAO.
+You should be able to
+[enter bootloader mode](https://wiki.seeedstudio.com/Seeeduino-XIAO/#enter-bootloader-mode)
+and just drag the `.uf2` file onto the new drive it provides,
+then you're done.
+
+#### The Other Way
+
+Install the MidiUSB and Keyboard libraries.
 These are highly popular libraries,
 and there is much better documentation elsewhere on the Internet.
+The code should then build in the Arduino IDE.
 
+## Step 2: Assmble the circuit
 
-== Step 2: Assmble the circuit
+### For the impatient:
 
-=== For the impatient:
+[Photos of assembled circuit](https://github.com/nealey/vail-adapter/wiki)
 
-https://github.com/nealey/vail-adapter/wiki[Photos of assembled circuit]
-
-Remember to jump pin 9 to ground for Firefox,
-or VBand.
-
-=== For the inquisitive:
+### For the inquisitive:
 
 Morse code keyers are very simple devices, 
 they just connect two wires together.
@@ -70,22 +73,21 @@ or even touch wires together.
 The only real complication here is that some browsers
 need to get keyboard events instead of musical instrument events.
 
+The Vail adapter boots into a mode that sends both keyboard events
+and MIDI messages. 
+If it receives a MIDI key release event
+on channel 0
+for note C0,
+it will disable keyboard events.
 
-=== Decide what browser you're going to use
+Vail sends this "disable keyboard" MIDI event, so as soon as you
+load up Vail, the keyboard events are disabled, and your adapter
+will no longer interfere with your typing.
+If your browser doesn't support MIDI, 
+the disable command can't be sent,
+and it keeps on sending keystrokes.
 
-Firefox needs a jumper between pin 9 and ground.
-Just take a wire, and connect pin 9 directly to ground.
-This puts the Arduino into "keyboard mode",
-where it sends a comma for straight key,
-and brackets for iambic.
-
-If you don't connect pin 9 to ground,
-the Arudino only sends MIDI (Musical Instrument Digital Interface)
-events, so it looks like you hooked a piano up.
-This works great in Chrome,
-and lets you switch to other windows while still keying into vail.
-
-=== Wire up your input device
+### Wire up your input device
 
 Hook a straight key into ground on one side,
 pin 10 on the other.
@@ -109,21 +111,15 @@ Make sure any straight key you plug in has a TS adapter (mono plug):
 this will short pin 11 to ground and signal to the Arduino to 
 go into straight key mode.
 
-You need to reset the Arduino if you change from an iambic to straight key.
-On the micro, reset is a white button.
-
-If you plug in your straight key and it looks like DAH is being held down,
-it means you need to switch the connections to pins 11 and 12.
-
-If you plug in your straight key and it looks like DIT is being held down,
-it means you need to reset the Arduino to make it detect the key type again.
+If you change from an iambic key to a straight key,
+you'll have to reset the adapter by unplugging it from the computer.
 
 
-== Step 3: Load the code
+## Step 3: Load the code
 
 Upload the code contained in this sketch on to your board.
 
-== Step 4: Test it out
+## Step 4: Test it out
 
 Make sure it's plugged in to your computer's USB port.
 
@@ -136,8 +132,16 @@ Now you can open https://vail.woozle.org/,
 click the "KEY" button once to let the browser know it's okay to make sound,
 and you should be able to wail away on your new USB keyer.
 
+## Step 5: Debugging
 
-=== License
+If you plug in your straight key and it looks like DAH is being held down,
+it means you need to switch the connections to pins 11 and 12.
+
+If you plug in your straight key and it looks like DIT is being held down,
+it means you need to reset the Arduino to make it detect the key type again.
+
+
+# License
 
 This project is released under an MIT License.
 
@@ -162,12 +166,12 @@ in an action of contract, tort or otherwise, arising from, out of, or in
 connection with the software or the use or other dealings in the software.
 
 
-=== Contributing
+# Contributing
 To contribute to this project please contact neale@woozle.org
 https://id.arduino.cc/neale
 
 
-=== BOM
+# BOM
 
 In addition to a key, some hookup wires, and a USB cable,
 you only need a USB-capable Arduino: see above.
@@ -176,15 +180,6 @@ Since I don't know what might try to parse this section,
 I'm calling for an Arduino Micro. But, really, many options
 will work fine.
 
-|===
-| ID | Part name      | Part number | Quantity
-| A1 | Arduino Micro  | ABX00053    | 1
-|===
-
-
-=== Help
-
-This document is written in the _AsciiDoc_ format, a markup language to describe documents.
-If you need help you can search the http://www.methods.co.nz/asciidoc[AsciiDoc homepage]
-or consult the http://powerman.name/doc/asciidoc[AsciiDoc cheatsheet]
-
+| ID | Part name      | Part number | Quantity |
+| --- | ------- | ------ | ------ |
+| A1 | Seeeduino XIAO | 102010328    | 1 |
diff --git a/install.sh b/install.sh
new file mode 100755
index 0000000..3ca4683
--- /dev/null
+++ b/install.sh
@@ -0,0 +1,15 @@
+#! /bin/sh
+
+src=$1
+dst=$2
+
+info=$dst/INFO_UF2.txt
+echo -n "Waiting for $info to appear..."
+while ! [ -f $info ]; do
+    echo -n "."
+    sleep 1
+done
+echo "👍"
+
+cp $src $dst
+echo "Installed!"
diff --git a/vail-adapter.ino b/vail-adapter.ino
index 8934603..ebc2790 100644
--- a/vail-adapter.ino
+++ b/vail-adapter.ino
@@ -8,30 +8,27 @@
 #include "bounce2.h"
 
 #ifdef ARDUINO_SEEED_XIAO_M0
-#define DIT_PIN 2
-#define DAH_PIN 1
-#define KEY_PIN 0
+#  define DIT_PIN 2
+#  define DAH_PIN 1
+#  define KEY_PIN 0
 #else
-#define DIT_PIN 12
-#define DAH_PIN 11
-#define KEY_PIN 10
+#  define DIT_PIN 12
+#  define DAH_PIN 11
+#  define KEY_PIN 10
 #endif
 
-#define KBD_PIN 9
-
 #define STRAIGHT_KEY ','
-#define DIT_KEY '['
-#define DAH_KEY ']'
+#define DIT_KEY KEY_LEFT_CTRL
+#define DAH_KEY KEY_RIGHT_CTRL
 
 bool iambic = true;
-Bounce kbd = Bounce();
+bool keyboard = true;
 Bounce dit = Bounce();
 Bounce dah = Bounce();
 Bounce key = Bounce();
 
 void setup() {
   pinMode(LED_BUILTIN, OUTPUT);
-  kbd.attach(KBD_PIN, INPUT_PULLUP);
   dit.attach(DIT_PIN, INPUT_PULLUP);
   dah.attach(DAH_PIN, INPUT_PULLUP);
   key.attach(KEY_PIN, INPUT_PULLUP);
@@ -49,8 +46,13 @@ void setup() {
   } else {
     iambic = true;
   }
-  
-  digitalWrite(LED_BUILTIN, !iambic);
+
+  // Blink 4 times
+  for (int i = 0; i < 8; i += 1) {
+    digitalWrite(LED_BUILTIN, i % 2);
+    delay(250);
+  }
+
 }
 
 void midiKey(bool down, uint8_t key) {
@@ -59,11 +61,20 @@ void midiKey(bool down, uint8_t key) {
   MidiUSB.flush();
 }
 
+void midiProbe() {
+  midiEventPacket_t event = MidiUSB.read();
+  if (event.byte1 == 0x80) { 
+    // Key release, channel 0
+    if (event.byte2 == 0x00) { 
+      // C0 note
+      keyboard = false;
+    }
+  }  
+}
+
 void loop() {
-  bool keyboard;
-  
-  kbd.update();
-  keyboard = !kbd.read();
+  midiProbe();
+  digitalWrite(LED_BUILTIN, !keyboard);
 
   // Monitor straight key pin
   if (key.update()) {