diff --git a/C/attiny10-test/.envrc b/C/attiny10-test/.envrc
new file mode 100644
index 0000000..cbde1db
--- /dev/null
+++ b/C/attiny10-test/.envrc
@@ -0,0 +1 @@
+use flake ../..#avr
diff --git a/C/attiny10-test/.gitignore b/C/attiny10-test/.gitignore
new file mode 100644
index 0000000..20596b5
--- /dev/null
+++ b/C/attiny10-test/.gitignore
@@ -0,0 +1,2 @@
+*.o
+*.elf
diff --git a/C/attiny10-test/Makefile b/C/attiny10-test/Makefile
new file mode 100644
index 0000000..f327d5e
--- /dev/null
+++ b/C/attiny10-test/Makefile
@@ -0,0 +1,12 @@
+AVRDUDE ?= avrdude -p t10 -c atmelice_tpi
+CC = avr-gcc
+CFLAGS = -mmcu=attiny10 -Wall -std=c11 -Os -DF_CPU=1000000 -L$(LIBC)/avr/lib/avrtiny -B$(LIBC)/avr/lib/avrtiny
+
+%.o: %.c
+	$(CC) -c $(CFLAGS) $< -o $@
+
+main.elf: main.o
+	$(CC) $(CFLAGS) main.o -o main.elf
+
+flash: main.elf
+	$(AVRDUDE) -U flash:w:main.elf:e
diff --git a/C/attiny10-test/main.c b/C/attiny10-test/main.c
new file mode 100644
index 0000000..8d91cdc
--- /dev/null
+++ b/C/attiny10-test/main.c
@@ -0,0 +1,10 @@
+#include <avr/io.h>
+#include <util/delay.h>
+
+int main(void) {
+	DDRB = 1 << 2;
+	while(1) {
+		PORTB ^= 1 << 2;
+		_delay_ms(500);
+	}
+}
diff --git a/flake.nix b/flake.nix
index 4fa2efd..c450873 100644
--- a/flake.nix
+++ b/flake.nix
@@ -82,7 +82,14 @@
           ];
           RUST_SRC_PATH = "${rust}/lib/rustlib/src/rust/library";
         };
+        devShells.avr = with pkgs; pkgsCross.avr.mkShell {
+          packages = [
+            avrdude
+            gnumake
+          ];
 
+          LIBC = pkgsCross.avr.avrlibc;
+        };
         devShells.typst = with pkgs; mkShell { packages = [ typst ]; };
         formatter = pkgs.nixfmt;
       });