diff --git a/arduino/autonomous/autonomous.ino b/arduino/autonomous/autonomous.ino
index 0e9d6e1..3ae5e7a 100644
--- a/arduino/autonomous/autonomous.ino
+++ b/arduino/autonomous/autonomous.ino
@@ -143,15 +143,16 @@ void loop()
     //grey(led);
   }
 
-  int i;
-  for (led = 0; led < cpinsets; led++) {
-    for (i = 0; i < CH; i++) {
-      //Serial.print(cpin[led][i], DEC); Serial.print("="); Serial.print(c[led][i], DEC); Serial.print("/"); Serial.print(cmax[led][i], DEC); Serial.print(" ");
-      lb[cpin[led][i] >> 4].setPinPWM(cpin[led][i] & 0xf, c[led][i]);
+  for (int i = 0; i < NUM_TLCS; i++) {
+    // XXX: We assume static allocation of channels to pins 0..14 (in order)
+    // TODO: Just use unsigned char for c[] ?
+    unsigned char dutycycles[16];
+    int *cblock = (int *) &c[i * LEDS_PER_TLC];
+    for (int j = 0; j < 16; j++) {
+      dutycycles[j] = cblock[j];
     }
+    lb[i].setAllPinPWM(dutycycles);
   }
-  //Serial.print(NUM_TLCS, DEC);
-  //Serial.println();
 
   delay(wait);
 }
diff --git a/arduino/ledbar.h b/arduino/ledbar.h
index 7c4ffad..ba61d30 100644
--- a/arduino/ledbar.h
+++ b/arduino/ledbar.h
@@ -16,6 +16,7 @@ class Ledbar {
 	/* pin is 0 .. 15 */
 	void setPinMode(int pin, enum LedbarPinMode pinMode);
 	void setPinPWM(int pin, unsigned char dutyCycle);
+	void setAllPinPWM(unsigned char dutyCycles[16]);
 	private:
 	unsigned char address;
 	unsigned char rawPinModes[4];
@@ -49,16 +50,26 @@ void Ledbar::setPinPWM(int pin, unsigned char dutyCycle)
 	Wire.endTransmission();
 }
 
+void Ledbar::setAllPinPWM(unsigned char dutyCycles[16])
+{
+	Wire.beginTransmission(address);
+	Wire.write(0b10100000 /* autoincrement */ | 0x2);
+	for (int i = 0; i < 16; i++)
+		Wire.write(dutyCycles[i]);
+	Wire.endTransmission();
+}
+
 
 /** Current ledbar configuration: */
 
 #define NUM_TLCS 2
+#define LEDS_PER_TLC 5
 
 #define TLCCH(tlc_num, ch_num) ((tlc_num) << 4 | (ch_num))
 
 #define CH 3
 
-const int cpin[5 * NUM_TLCS][CH] = {
+const int cpin[LEDS_PER_TLC * NUM_TLCS][CH] = {
   {TLCCH(0, 0), TLCCH(0, 1), TLCCH(0, 2)},
   {TLCCH(0, 3), TLCCH(0, 4), TLCCH(0, 5)},
   {TLCCH(0, 6), TLCCH(0, 7), TLCCH(0, 8)},