diff --git a/Makefile b/Makefile
index 7d192f3..f7db7d1 100644
--- a/Makefile
+++ b/Makefile
@@ -146,12 +146,15 @@ $(PREFIX)/bin/scrot:
 	sh -c 'cd $(PREFIX)/src/scrot && ./autogen.sh && ./configure MAKE=$(MAKE) PREFIX=$(PREFIX)'
 	$(MAKE) -C $(PREFIX)/src/scrot install
 
+# I tried final_official_2.50 but it wouldn't build
+# (ld: error: duplicate symbol: comDat)
 # depends on
 #	apk:sudo
 $(PREFIX)/src/wiringpi:
 	git clone https://github.com/WiringPi/WiringPi.git $(PREFIX)/src/wiringpi
-	git -C $(PREFIX)/src/wiringpi checkout final_official_2.50
-	sed -i .tmp -e /^sudo/d $(PREFIX)/src/wiringpi/build
+	git -C $(PREFIX)/src/wiringpi checkout 2.61-1
+	sed -i .old -e /^sudo/d $(PREFIX)/src/wiringpi/build
+	sed -i .old -e s/root\.root/root\:root/ $(PREFIX)/src/wiringpi/gpio
 	sh -c 'cd $(PREFIX)/src/wiringpi; sudo=sudo ./build'
 
 $(PREFIX)/bin/xdo:
diff --git a/ht16k33/Makefile b/ht16k33/Makefile
new file mode 100644
index 0000000..6341795
--- /dev/null
+++ b/ht16k33/Makefile
@@ -0,0 +1,3 @@
+CFLAGS += -I/usr/local/include -L/usr/local/lib
+ht16k33: ht16k33.c
+	$(CC) $(CFLAGS) -lwiringPi -o ht16k33 ht16k33.c
diff --git a/ht16k33/README.txt b/ht16k33/README.txt
new file mode 100644
index 0000000..499dbf0
--- /dev/null
+++ b/ht16k33/README.txt
@@ -0,0 +1,2 @@
+This program depends on WiringPi. Build instructions can be found in the
+Makefile in the root of this project.
diff --git a/ht16k33/ht16k33.c b/ht16k33/ht16k33.c
new file mode 100644
index 0000000..a2ac1c7
--- /dev/null
+++ b/ht16k33/ht16k33.c
@@ -0,0 +1,14 @@
+#include <unistd.h>
+#include <wiringPiI2C.h>
+#include "ht16k33.h"
+
+/* https://cdn-shop.adafruit.com/datasheets/ht16K33v110.pdf */
+
+#define ADDRESS 0x70
+
+int main(int argc, char *argv[]){
+	int fd;
+
+	fd = wiringPiI2CSetup(ADDRESS);
+	close(fd);
+}
diff --git a/ht16k33/ht16k33.h b/ht16k33/ht16k33.h
new file mode 100644
index 0000000..4c7c81a
--- /dev/null
+++ b/ht16k33/ht16k33.h
@@ -0,0 +1,11 @@
+/* Definitions were determined by reading Adafruit code and the datasheet. */
+
+#define HT16K33_SYSTEM_CMD 0x20 /* 0b0010???x */
+#define HT16K33_SYSTEM_ON 0x01 /* 0b00000001 */
+#define HT16K33_SYSTEM_OFF 0x00 /* 0b00000000 */
+
+/* `0xE0 | n`, where 0 <= n <= 15 and the display dims to (n+1)/16 duty */
+#define HT16K33_CMD_BRIGHTNESS 0xE0 /* 0b1110xxxx */
+
+#define HT16K33_BLINK_CMD 0x80 /* 0b1000?xxx */
+#define HT16K33_BLINK_DISPLAYON 0x01 /* 0b1000???x */