diff --git a/src/fan_ctrl_pwm.c b/src/fan_ctrl_pwm.c
index feb23c7..54ceb91 100644
--- a/src/fan_ctrl_pwm.c
+++ b/src/fan_ctrl_pwm.c
@@ -11,32 +11,32 @@ void fan_ctrl_pwm_init(void)
 	gpio_clear(DCDC_PORT, DCDC_BYPASS_SWITCH_PIN);
 	gpio_mode_setup(DCDC_PORT, GPIO_MODE_OUTPUT, GPIO_PUPD_NONE, DCDC_BYPASS_SWITCH_PIN);
 
-	// *** TIM21 ***
-	// Configure channel 1 for PWM
+	// *** TIM2 ***
+	// Configure channel 2 for PWM
 	// Ch1 = charge pump output
 
-	timer_set_mode(TIM21, TIM_CR1_CKD_CK_INT, TIM_CR1_CMS_EDGE, TIM_CR1_DIR_UP);
+	timer_set_mode(TIM2, TIM_CR1_CKD_CK_INT, TIM_CR1_CMS_EDGE, TIM_CR1_DIR_UP);
 
 	// set up PWM channel
-	timer_set_oc_mode(TIM21, TIM_OC1, TIM_OCM_PWM1);
-	timer_enable_oc_output(TIM21, TIM_OC1);
-	timer_enable_oc_preload(TIM21, TIM_OC1);
-	timer_set_oc_polarity_high(TIM21, TIM_OC1);
+	timer_set_oc_mode(TIM2, TIM_OC2, TIM_OCM_PWM1);
+	timer_enable_oc_output(TIM2, TIM_OC2);
+	timer_enable_oc_preload(TIM2, TIM_OC2);
+	timer_set_oc_polarity_high(TIM2, TIM_OC2);
 
 	// prescaler
-	timer_set_prescaler(TIM21, 21 - 1); // Timer runs at 100 kHz
+	timer_set_prescaler(TIM2, 21 - 1); // Timer runs at 100 kHz
 
 	// auto-reload value
-	timer_set_period(TIM21, 100 - 1); // overflow every 100 cycles = 1 kHz
+	timer_set_period(TIM2, 100 - 1); // overflow every 100 cycles = 1 kHz
 
 	// output compare value
-	timer_set_oc_value(TIM21, TIM_OC1, 0); // No PWM output by default
+	timer_set_oc_value(TIM2, TIM_OC2, 0); // No PWM output by default
 
 	// only generate interrupt on overflow
-	timer_update_on_overflow(TIM21);
+	timer_update_on_overflow(TIM2);
 
 	// enable main output
-	timer_enable_break_main_output(TIM21);
+	timer_enable_break_main_output(TIM2);
 }
 
 
@@ -50,7 +50,7 @@ void fan_ctrl_pwm_enable(void)
 	gpio_set_af(FAN_PORT, GPIO_AF0, FAN_PWM_PIN);
 
 	// start the PWM timer
-	timer_enable_counter(TIM21);
+	timer_enable_counter(TIM2);
 }
 
 
@@ -60,8 +60,8 @@ void fan_ctrl_pwm_disable(void)
 	gpio_clear(DCDC_PORT, DCDC_BYPASS_SWITCH_PIN);
 
 	// set PWM value to 0 and stop the counter
-	timer_set_oc_value(TIM21, TIM_OC1, 0);
-	timer_disable_counter(TIM21);
+	timer_set_oc_value(TIM2, TIM_OC2, 0);
+	timer_disable_counter(TIM2);
 
 	// configure the PWM GPIO as input so the fan runs full speed if powered
 	gpio_mode_setup(FAN_PORT, GPIO_MODE_INPUT, GPIO_PUPD_NONE, FAN_PWM_PIN);
@@ -71,5 +71,5 @@ void fan_ctrl_pwm_disable(void)
 void fan_ctrl_pwm_set_duty(uint8_t percent)
 {
 	// as the timer has 100 steps per cycle, we can directly use the percentage value
-	timer_set_oc_value(TIM21, TIM_OC1, percent);
+	timer_set_oc_value(TIM2, TIM_OC2, percent);
 }
diff --git a/src/main.c b/src/main.c
index ac905d1..61a6d62 100644
--- a/src/main.c
+++ b/src/main.c
@@ -1,4 +1,5 @@
 #include <libopencm3/stm32/rcc.h>
+#include <libopencm3/stm32/gpio.h>
 #include <libopencm3/cm3/systick.h>
 #include <libopencmsis/core_cm3.h>
 
@@ -9,6 +10,8 @@
 #include "fan_controller.h"
 #include "eeprom_config.h"
 
+#include "pinout.h"
+
 #define SYSTICK_FREQ   10 // Hz
 
 static uint64_t timebase_ms = 0;
@@ -66,7 +69,9 @@ int main(void)
 	uart_enqueue("TinyFanControl v" VERSION " initialized.\n");
 
 	uint8_t last_duty = 0;
-	bool use_dcdc = EEPROM_CONFIG_FLAGS & EEPROM_CONFIG_FLAG_USE_DCDC_CONTROL;
+
+	gpio_clear(LED_PORT, LED_PIN);
+	gpio_mode_setup(LED_PORT, GPIO_MODE_OUTPUT, GPIO_PUPD_NONE, LED_PIN);
 
 	while (1) {
 		if(systick_triggered) {
@@ -74,6 +79,8 @@ int main(void)
 
 			timebase_ms += 1000 / SYSTICK_FREQ;
 
+			//uint32_t timebase_ms_fast = timebase_ms & 0xFFFFFFFF;
+
 			// start the measurement in the background.
 			temp_sensor_trigger_update();
 		}
@@ -87,12 +94,16 @@ int main(void)
 
 			// handle fan power-on and power-off
 			if(last_duty == 0 && duty != 0) {
+				gpio_set(LED_PORT, LED_PIN);
+
 				if(use_dcdc) {
 					fan_ctrl_dc_enable();
 				} else {
 					fan_ctrl_pwm_enable();
 				}
 			} else if(last_duty != 0 && duty == 0) {
+				gpio_clear(LED_PORT, LED_PIN);
+
 				if(use_dcdc) {
 					fan_ctrl_dc_disable();
 				} else {
diff --git a/src/pinout.h b/src/pinout.h
index eb8ac27..8777aa4 100644
--- a/src/pinout.h
+++ b/src/pinout.h
@@ -3,10 +3,10 @@
 
 /* Fan-related pins */
 
-#define FAN_PORT         GPIOA
+#define FAN_PORT         GPIOB
 
-#define FAN_PWM_PIN      GPIO2
-#define FAN_TACHO_PIN    GPIO3
+#define FAN_PWM_PIN      GPIO3
+//#define FAN_TACHO_PIN    GPIO3
 
 /* DC/DC control pins */
 
@@ -29,8 +29,14 @@
 
 #define UART_PORT        GPIOA
 
-#define UART_TX_PIN      GPIO14
-#define UART_RX_PIN      GPIO15
+#define UART_TX_PIN      GPIO2
+#define UART_RX_PIN      GPIO3
+
+/* LED */
+
+#define LED_PORT         GPIOA
+
+#define LED_PIN          GPIO10
 
 
 #endif // PINOUT_H