diff --git a/code/nrf-connect/CMakeLists.txt b/code/nrf-connect/CMakeLists.txt
index e4f3269..dbbd3cf 100644
--- a/code/nrf-connect/CMakeLists.txt
+++ b/code/nrf-connect/CMakeLists.txt
@@ -4,6 +4,4 @@ find_package(Zephyr REQUIRED HINTS $ENV{ZEPHYR_BASE})
 
 project(b_parasite)
 
-# set(BOARD_ROOT .)
-
-target_sources(app PRIVATE src/main.c src/prst/shtc3.c src/prst/adc.c)
+target_sources(app PRIVATE src/main.c src/prst/shtc3.c src/prst/adc.c src/prst/led.c)
diff --git a/code/nrf-connect/boards/arm/bparasite_nrf52840/bparasite_nrf52840.dts b/code/nrf-connect/boards/arm/bparasite_nrf52840/bparasite_nrf52840.dts
index c3cee1d..92a81f2 100644
--- a/code/nrf-connect/boards/arm/bparasite_nrf52840/bparasite_nrf52840.dts
+++ b/code/nrf-connect/boards/arm/bparasite_nrf52840/bparasite_nrf52840.dts
@@ -7,11 +7,6 @@
 	compatible = "rbaron,bparasite_nrf52840";
 
 	chosen {
-		// zephyr,console = &uart0;
-		// zephyr,shell-uart = &uart0;
-		// zephyr,uart-mcumgr = &uart0;
-		// zephyr,bt-mon-uart = &uart0;
-		// zephyr,bt-c2h-uart = &uart0;
 		zephyr,sram = &sram0;
 		zephyr,flash = &flash0;
 		zephyr,code-partition = &slot0_partition;
@@ -21,6 +16,14 @@
 		io-channels = <&adc 0>, <&adc 1>, <&adc 2>;
 	};
 
+	leds {
+		compatible = "gpio-leds";
+		led0: led_0 {
+			// P0.28.
+			gpios = <&gpio0 28 GPIO_ACTIVE_HIGH>;
+		};
+	};
+
 	soil_pwm: soil_pwm {
 		compatible = "pwm-fixed";
 		pwms = <&pwm0 0 PWM_MSEC(100) PWM_POLARITY_INVERTED>;
diff --git a/code/nrf-connect/src/main.c b/code/nrf-connect/src/main.c
index 395cc4d..3c42972 100644
--- a/code/nrf-connect/src/main.c
+++ b/code/nrf-connect/src/main.c
@@ -2,15 +2,15 @@
 #include <zephyr/zephyr.h>
 
 #include "prst/adc.h"
+#include "prst/led.h"
 #include "prst/macros.h"
 #include "prst/shtc3.h"
 
 LOG_MODULE_REGISTER(main, LOG_LEVEL_DBG);
 
 int main(void) {
-  if (prst_adc_init() != 0) {
-    LOG_ERR("Error initializing ADC.");
-  }
+  RET_IF_ERR(prst_adc_init());
+  RET_IF_ERR(prst_led_init());
 
   prst_adc_read_t batt;
   prst_adc_soil_moisture_t soil;
@@ -20,11 +20,13 @@ int main(void) {
     RET_IF_ERR(prst_adc_soil_read(batt.voltage, &soil));
     RET_IF_ERR(prst_adc_photo_read(batt.voltage, &photo));
 
-    // LOG_INF("Batt: %d mV", batt.millivolts);
-    // LOG_INF("Soil: %.0f %% (%.3f mV)", 100 * soil.percentage,
-    //         soil.adc_read.voltage);
+    LOG_INF("Batt: %d mV", batt.millivolts);
+    LOG_INF("Soil: %.0f %% (%.3f mV)", 100 * soil.percentage,
+            soil.adc_read.voltage);
     LOG_INF("Photo: %u lx (%.3f mV)", photo.brightness, soil.adc_read.voltage);
 
+    prst_led_flash(3);
+
     k_msleep(500);
   }
 }
diff --git a/code/nrf-connect/src/prst/led.c b/code/nrf-connect/src/prst/led.c
new file mode 100644
index 0000000..10c1f7e
--- /dev/null
+++ b/code/nrf-connect/src/prst/led.c
@@ -0,0 +1,17 @@
+#include "led.h"
+
+#include <drivers/gpio.h>
+
+#include "macros.h"
+
+LOG_MODULE_REGISTER(led, LOG_LEVEL_DBG);
+
+struct gpio_dt_spec led = GPIO_DT_SPEC_GET(DT_NODELABEL(led0), gpios);
+
+int prst_led_init() {
+  if (!device_is_ready(led.port)) {
+    LOG_ERR("DEV NOT READY");
+    return -1;
+  }
+  return gpio_pin_configure_dt(&led, GPIO_OUTPUT);
+}
\ No newline at end of file
diff --git a/code/nrf-connect/src/prst/led.h b/code/nrf-connect/src/prst/led.h
new file mode 100644
index 0000000..e8519ef
--- /dev/null
+++ b/code/nrf-connect/src/prst/led.h
@@ -0,0 +1,33 @@
+#ifndef _PRST_LED_H_
+#define _PRST_LED_H_
+
+#include <drivers/gpio.h>
+#include <logging/log.h>
+
+#include "macros.h"
+
+#define PRST_LED_FLASH_PERIOD_MS 400
+
+extern struct gpio_dt_spec led;
+
+int prst_led_init();
+
+static inline int prst_led_on() {
+  return gpio_pin_set_dt(&led, 1);
+}
+
+static inline int prst_led_off() {
+  return gpio_pin_set_dt(&led, 0);
+}
+
+static inline int prst_led_flash(int times) {
+  LOG_MODULE_DECLARE(led, LOG_LEVEL_DBG);
+  RET_IF_ERR(prst_led_off());
+  for (int i = 0; i < 2 * times; i++) {
+    RET_IF_ERR(gpio_pin_toggle_dt(&led));
+    k_msleep(PRST_LED_FLASH_PERIOD_MS / 2);
+  }
+  return 0;
+}
+
+#endif  // _PRST_LED_H_
\ No newline at end of file