diff --git a/app/main.c b/app/main.c
index 3a398d9..352b2ee 100644
--- a/app/main.c
+++ b/app/main.c
@@ -116,6 +116,9 @@ static void gpio_pin_init(void)
     cfg.port = GPIOB;
     cfg.pin = 3;
     gpio_init(&cfg);
+    cfg.port = GPIOB;
+    cfg.pin = 4;
+    gpio_init(&cfg);
 }
 
 static void uart_config_all(void)
@@ -210,7 +213,8 @@ int main(void)
 
     log_out("INFO: System initialized\n");
 
-    while (1) {
+    while (1)
+    {
         work_task_run();
         monitor_task_run();
 
diff --git a/drv/adc/adc_driver.c b/drv/adc/adc_driver.c
index 2bff12a..853f775 100644
--- a/drv/adc/adc_driver.c
+++ b/drv/adc/adc_driver.c
@@ -10,7 +10,7 @@ ret_code_t adc_init(void)
 
     ADC1->CFGR1 = ADC_CFGR1_RES_1;
 
-    ADC1->CHSMPR2 = (0x7 << 0);
+    ADC1->CHSMPR2 = (0x7 << 3);
 
     ADC1->SMPR1 = 0x07;
 
diff --git a/drv/adc/pga_driver.h b/drv/adc/pga_driver.h
index 8b382e6..6f4a84c 100644
--- a/drv/adc/pga_driver.h
+++ b/drv/adc/pga_driver.h
@@ -5,7 +5,7 @@
 #include "sys_data_bus.h"
 #include <stdint.h>
 
-#define PGA_ADC_CH            ADC_CH_0
+#define PGA_ADC_CH            ADC_CH_6
 
 #define PGA_GAIN_1            0x00
 #define PGA_GAIN_2            0x01