diff --git a/lib/busvoodoo_global.h b/lib/busvoodoo_global.h
index 5c95f64..30aafc3 100644
--- a/lib/busvoodoo_global.h
+++ b/lib/busvoodoo_global.h
@@ -104,6 +104,9 @@
 #define BUSVOODOO_HW_VERSION_CHANNEL 8 /**< ADC to identify hardware version */
 /** @} */
 
+/** recommended duration in ms for pulsing LEDs to show activity */
+#define BUSVOODOO_LED_PULSE 100
+
 /** BusVoodoo mode interface */
 struct busvoodoo_mode_t {
 	const char* name; /**< name of the mode (i.e. protocol shortcut for the menu) */
diff --git a/lib/busvoodoo_i2c.c b/lib/busvoodoo_i2c.c
index 710ce57..c98232f 100644
--- a/lib/busvoodoo_i2c.c
+++ b/lib/busvoodoo_i2c.c
@@ -119,7 +119,7 @@ static bool busvoodoo_i2c_setup(char** prefix, const char* line)
 				i2c_master_setup(BUSVOODOO_I2C, busvoodoo_i2c_speed); // setup I2C
 				if (busvoodoo_i2c_embedded_pullup) {
 					busvoodoo_embedded_pullup(true); // set pull-up
-					printf("use LV to set voltage\n");
+					printf("use LV to set pull-up voltage\n");
 				}
 				led_off(); // disable LED because there is no activity
 				busvoodoo_i2c_setting = BUSVOODOO_I2C_SETTING_NONE; // restart settings next time
@@ -155,7 +155,7 @@ static void busvoodoo_i2c_exit(void)
 static void busvoodoo_i2c_read(void)
 {
 	printf("read: ");
-	busvoodoo_blue_blue(100); // pulse blue LED to show we read data
+	busvoodoo_led_blue_pulse(BUSVOODOO_LED_PULSE); // pulse blue LED to show we read data
 	uint8_t data; // to store the data read
 	switch (i2c_master_read(BUSVOODOO_I2C, &data, 1)) {
 		case I2C_MASTER_RC_NONE: // all went fine
@@ -182,7 +182,7 @@ static void busvoodoo_i2c_read(void)
 static void busvoodoo_i2c_write(uint8_t data)
 {
 	printf("write 0x%02x: ", data);
-	busvoodoo_red_blue(100); // pulse red LED to show we send data
+	busvoodoo_led_red_pulse(BUSVOODOO_LED_PULSE); // pulse red LED to show we send data
 	switch (i2c_master_write(BUSVOODOO_I2C, &data, 1)) {
 		case I2C_MASTER_RC_NONE: // all went fine
 			printf("ack");
@@ -218,7 +218,7 @@ static void busvoodoo_i2c_select(uint16_t slave, bool write)
 		printf("0x%02x", slave);
 	}
 	printf(" to %s: ", write ? "write" : "read");
-	busvoodoo_red_blue(100); // pulse red LED to show we send the slave address
+	busvoodoo_led_red_pulse(BUSVOODOO_LED_PULSE); // pulse red LED to show we send the slave address
 	switch (i2c_master_select_slave(BUSVOODOO_I2C, slave, 10==busvoodoo_i2c_addressbits, write)) {
 		case I2C_MASTER_RC_NONE: // all went fine
 			printf("selected");
@@ -267,7 +267,7 @@ static bool busvoodoo_i2c_action(const char* action, uint32_t repetition, bool p
 		}
 		printf("send start condition: ");
 		for (uint32_t i=0; i<repetition; i++) {
-			busvoodoo_red_blue(100); // pulse red LED to show we send start condition
+			busvoodoo_led_red_pulse(BUSVOODOO_LED_PULSE); // pulse red LED to show we send start condition
 			printf("%s ", I2C_MASTER_RC_NONE==i2c_master_start(BUSVOODOO_I2C) ? "sent" : "error");
 		}
 		printf("\n");
@@ -277,7 +277,7 @@ static bool busvoodoo_i2c_action(const char* action, uint32_t repetition, bool p
 		}
 		printf("send stop condition: ");
 		for (uint32_t i=0; i<repetition; i++) {
-			busvoodoo_red_blue(100); // pulse red LED to show we send stop condition
+			busvoodoo_led_red_pulse(BUSVOODOO_LED_PULSE); // pulse red LED to show we send stop condition
 			printf("%s ", I2C_MASTER_RC_NONE==i2c_master_stop(BUSVOODOO_I2C) ? "sent" : "error");
 		}
 		printf("\n");
@@ -440,10 +440,10 @@ static void busvoodoo_i2c_command_scan(void* argument)
 	int16_t i2c_slaves = 0; // number of slaves found
 	// check for I2C slaves by going through the address space
 	for (uint16_t address=0; address < (1<<busvoodoo_i2c_addressbits); address++) {
-		busvoodoo_led_blue(100); // pulse blue LED to show transmission
+		busvoodoo_led_red_pulse(BUSVOODOO_LED_PULSE); // pulse red LED to show transmission
 		switch (i2c_master_select_slave(BUSVOODOO_I2C, address, 10==busvoodoo_i2c_addressbits, false)) { // try to select slave (includes start condition)
 			case I2C_MASTER_RC_NONE: // slave found
-				busvoodoo_led_red(100); // pulse red LED to show we found a slave
+				busvoodoo_led_red_pulse(BUSVOODOO_LED_PULSE); // pulse blue LED to show we found a slave
 				printf((busvoodoo_i2c_addressbits>7) ? "0x%03x " : "0x%02x ", address); // display address
 				i2c_slaves++; // increase slave count
 				break;