diff --git a/.gitignore b/.gitignore
index 51b1099..a9520ea 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1 +1,3 @@
 src/blink/build
+blink/build
+blink/build
diff --git a/src/blink/build.sh b/blink/build.sh
similarity index 74%
rename from src/blink/build.sh
rename to blink/build.sh
index 98cbc3a..144d343 100755
--- a/src/blink/build.sh
+++ b/blink/build.sh
@@ -5,8 +5,7 @@ BUILD=./build
 mkdir -p $BUILD
 avr-gcc -mmcu=atmega328p -DF_CPU=16000000L \
 	-DARDUINO=10607 -DARDUINO_AVR_NANO -DARDUINO_ARCH_AVR \
-	-I/home/plex/.arduino15/packages/arduino/hardware/avr/1.8.6/cores/arduino \
-	-I/home/plex/.arduino15/packages/arduino/hardware/avr/1.8.6/variants/eightanaloginputs \
+	-I/usr/avr/include \
 	main.c -o $BUILD/main.elf
 avr-objcopy -O ihex -R .eeprom $BUILD/main.elf $BUILD/main.hex
 
diff --git a/src/blink/main.c b/blink/main.c
similarity index 100%
rename from src/blink/main.c
rename to blink/main.c
diff --git a/buttons/build.sh b/buttons/build.sh
new file mode 100755
index 0000000..144d343
--- /dev/null
+++ b/buttons/build.sh
@@ -0,0 +1,17 @@
+#!/bin/bash
+set -e
+TDIR=$(mktemp -d)
+BUILD=./build
+mkdir -p $BUILD
+avr-gcc -mmcu=atmega328p -DF_CPU=16000000L \
+	-DARDUINO=10607 -DARDUINO_AVR_NANO -DARDUINO_ARCH_AVR \
+	-I/usr/avr/include \
+	main.c -o $BUILD/main.elf
+avr-objcopy -O ihex -R .eeprom $BUILD/main.elf $BUILD/main.hex
+
+avr-size -A $BUILD/main.elf
+avrdude \
+	"-C/home/plex/.arduino15/packages/arduino/tools/avrdude/6.3.0-arduino17/etc/avrdude.conf" -v -V \
+	-patmega328p -carduino -P/dev/ttyUSB0 -b57600 -D \
+	-Uflash:w:$BUILD/main.hex:i
+
diff --git a/buttons/build/main.elf b/buttons/build/main.elf
new file mode 100755
index 0000000..a686ccc
Binary files /dev/null and b/buttons/build/main.elf differ
diff --git a/buttons/build/main.hex b/buttons/build/main.hex
new file mode 100644
index 0000000..bd124f1
--- /dev/null
+++ b/buttons/build/main.hex
@@ -0,0 +1,18 @@
+:100000000C9434000C943E000C943E000C943E0082
+:100010000C943E000C943E000C943E000C943E0068
+:100020000C943E000C943E000C943E000C943E0058
+:100030000C943E000C943E000C943E000C943E0048
+:100040000C943E000C943E000C943E000C943E0038
+:100050000C943E000C943E000C943E000C943E0028
+:100060000C943E000C943E0011241FBECFEFD8E04C
+:10007000DEBFCDBF0E9440000C9481000C940000B4
+:10008000CF93DF93CDB7DEB784E290E02FEFFC0192
+:1000900020838AE290E0FC0110828BE290E0FC0178
+:1000A00020818BE290E02C60FC01208385E290E0CF
+:1000B000FC01108289E290E0FC018081882F90E0B1
+:1000C00084709927009749F485E290E0FC01208133
+:1000D00085E290E02062FC01208389E290E0FC014F
+:1000E0008081882F90E088709927009719F785E222
+:1000F00090E0FC01208185E290E02F7DFC012083CF
+:06010000D9CFF894FFCFF7
+:00000001FF
diff --git a/buttons/main.c b/buttons/main.c
new file mode 100644
index 0000000..859f996
--- /dev/null
+++ b/buttons/main.c
@@ -0,0 +1,21 @@
+#define F_CPU 16000000UL
+#define __AVR_ATmega328P__
+#include <avr/io.h>
+
+int main(void) {
+  DDRB = 0xff;
+  DDRD = 0;
+
+  PORTD |= (1 << PORTD2) | (1 << PORTD3);
+
+  PORTB = 0;
+
+  while (1) {
+    if (!(PIND & (1 << PIND2))) {
+      PORTB |= (1 << PORTB5);
+    }
+    if (!(PIND & (1 << PIND3))) {
+      PORTB &= ~(1 << PORTB5);
+    }
+  }
+}