diff --git a/firmware/include/pentabug/matrix.h b/firmware/include/pentabug/matrix.h
index a4fd56d..6281d5a 100644
--- a/firmware/include/pentabug/matrix.h
+++ b/firmware/include/pentabug/matrix.h
@@ -10,5 +10,6 @@ void matrix_show(void);
 void matrix_init(void);
 
 void matrix_set(uint8_t x, uint8_t y, uint8_t active);
+void matrix_brightness(uint8_t x, uint8_t y, uint8_t brightness);
 
 #endif /* MATRIX_H */
diff --git a/firmware/lib/matrix.c b/firmware/lib/matrix.c
index 8cea181..6fdefd7 100644
--- a/firmware/lib/matrix.c
+++ b/firmware/lib/matrix.c
@@ -3,8 +3,9 @@
 #include <pentabug/timer.h>
 #include <pentabug/hal.h>
 
-static uint8_t pixels[9];
+static uint8_t pixels[9] = {0};
 static uint8_t index;
+static uint8_t cycle;
 
 void matrix_init(void) {
 	DDRD |= (1 << 5) | (1 << 6) | (1 << 7);
@@ -17,19 +18,19 @@ static void move_line(uint8_t line) {
 	PORTD &= ~(1 << (line + 5));
 }
 
-static void write_line(uint8_t data[]) {
+static void write_line(uint8_t data[], uint8_t timing) {
 	PORTC &= ~((1 << 5) | (1 << 4));
 	PORTB &= ~(1 << 2);
 
-	if(data[0]) {
+	if(data[0] > timing) {
 		PORTC |= 1 << 5;
 	}
 
-	if(data[1]) {
+	if(data[1] > timing) {
 		PORTC |= 1 << 4;
 	}
 
-	if(data[2]) {
+	if(data[2] > timing) {
 		PORTB |= 1 << 2;
 	}
 }
@@ -38,16 +39,17 @@ static void matrix_int(void) {
 	++index;
 
 	if(index >= 3) {
+		++cycle;
 		index = 0;
 	}
 
 	move_line(index);
-	write_line(pixels + (index * 3));
+	write_line(pixels + (index * 3), cycle & 3);
 }
 
 void matrix_start(void) {
 	matrix_init();
-	start_timer(PRESCALE_64, 125, matrix_int);
+	start_timer(PRESCALE_64, 32, matrix_int);
 }
 
 void matrix_stop(void) {
@@ -55,16 +57,22 @@ void matrix_stop(void) {
 }
 
 void matrix_show(void) {
-	uint8_t i;
+	for(uint8_t n = 0; n < 4; ++n) {
+		uint8_t i;
 
-	for(i = 0; i < 3; ++i) {
-		move_line(i);
-		write_line(pixels + (i * 3));
-		wait_ms(3);
+		for(i = 0; i < 3; ++i) {
+			move_line(i);
+			write_line(pixels + (i * 3), n);
+			wait_ms(1);
+		}
 	}
 }
 
 void matrix_set(uint8_t x, uint8_t y, uint8_t active) {
-	pixels[x*3+y] = active;
+	pixels[x*3+y] = active ? 4 : 0;
+}
+
+void matrix_brightness(uint8_t x, uint8_t y, uint8_t brightness) {
+	pixels[x*3+y] = brightness;
 }