diff --git a/flake.nix b/flake.nix
index d0388ef..255f076 100644
--- a/flake.nix
+++ b/flake.nix
@@ -46,7 +46,7 @@
           name = "morse-tx";
           src = ./.;
 
-          includes = [ "base" "spi" "morse" ];
+          includes = [ "base" "spi" "morse" "rfm69hcw" ];
 
           MCU = "atmega32u4";
           CHIP_SELECT = "AVR_ATmega32u4";
@@ -55,10 +55,11 @@
           INCLUDE_DIRS = lib.concatStringsSep " " (map (dir: "-I${src}/${dir}") includes);
 
           buildPhase = ''
+            ${avr.gcc}/bin/avr-gcc ${CFLAGS} ${INCLUDE_DIRS} -o rfm.o -c ${src}/rfm69hcw/rfm.c
             ${avr.gcc}/bin/avr-gcc ${CFLAGS} ${INCLUDE_DIRS} -o spi.o -c ${src}/spi/spi.c
             ${avr.gcc}/bin/avr-gcc ${CFLAGS} ${INCLUDE_DIRS} -o morse.o -c ${src}/morse/morse.c
             ${avr.gcc}/bin/avr-gcc ${CFLAGS} ${INCLUDE_DIRS} -o main.o -c ${src}/morse_tx/main.c
-            ${avr.gcc}/bin/avr-gcc ${CFLAGS} -o main.elf main.o morse.o spi.o
+            ${avr.gcc}/bin/avr-gcc ${CFLAGS} -o main.elf main.o morse.o spi.o rfm.o
             $OBJCOPY -O ihex main.elf main.hex
             '';
           installPhase = ''
@@ -73,7 +74,7 @@
           lib = pkgs.lib;
           avr = pkgs.pkgsCross.avr.buildPackages;
         in pkgs.stdenv.mkDerivation rec {
-          name = "morse-tx";
+          name = "spi-test";
           src = ./.;
 
           includes = [ "base" "spi" ];
@@ -96,6 +97,37 @@
             '';
         };
 
+      packages."x86_64-linux"."lcd" =
+        let
+          pkgs = import nixpkgs { system = "x86_64-linux"; };
+          lib = pkgs.lib;
+          avr = pkgs.pkgsCross.avr.buildPackages;
+        in pkgs.stdenv.mkDerivation rec {
+          name = "lcd";
+          src = ./.;
+
+          includes = [ "base" "shift_register" "spi" ];
+
+          MCU = "atmega32u4";
+          CHIP_SELECT = "AVR_ATmega32u4";
+          F_CPU = "8000000";
+          CFLAGS = ''-O -finline-functions -funsigned-char -funsigned-bitfields -fpack-struct -fshort-enums -Wall -Wstrict-prototypes -DF_CPU=${F_CPU} -std=gnu99 -D__${CHIP_SELECT}__=1 -mmcu=${MCU} -DAVR=1'';
+          INCLUDE_DIRS = lib.concatStringsSep " " (map (dir: "-I${src}/${dir}") includes);
+
+          buildPhase = ''
+            ${avr.gcc}/bin/avr-gcc ${CFLAGS} ${INCLUDE_DIRS} -o base.o -c ${src}/base/base.c
+            ${avr.gcc}/bin/avr-gcc ${CFLAGS} ${INCLUDE_DIRS} -o spi.o -c ${src}/spi/spi.c
+            ${avr.gcc}/bin/avr-gcc ${CFLAGS} ${INCLUDE_DIRS} -o reg.o -c ${src}/shift_register/reg.c
+            ${avr.gcc}/bin/avr-gcc ${CFLAGS} ${INCLUDE_DIRS} -o main.o -c ${src}/lcd/main.c
+            ${avr.gcc}/bin/avr-gcc ${CFLAGS} -o main.elf main.o reg.o spi.o base.o
+            $OBJCOPY -O ihex main.elf main.hex
+            '';
+          installPhase = ''
+            mkdir $out
+            cp main.elf main.hex $out
+            '';
+        };
+
       devShell."x86_64-linux" =
         let
           pkgs = import nixpkgs { system = "x86_64-linux"; };