diff --git a/examples/mqtt-dashboard/device/main.c b/examples/mqtt-dashboard/device/main.c
index be5e084d..5305b7ac 100644
--- a/examples/mqtt-dashboard/device/main.c
+++ b/examples/mqtt-dashboard/device/main.c
@@ -13,13 +13,13 @@ static void signal_handler(int signo) {
 static bool s_pins[100];
 
 void hal_gpio_write(int pin, bool status) {
-  if (pin >= 0 && pin <= (int) (sizeof(s_pins) / sizeof(s_pins[0]))) {
+  if (pin >= 0 && pin < (int) (sizeof(s_pins) / sizeof(s_pins[0]))) {
     s_pins[pin] = status;
   }
 }
 
 bool hal_gpio_read(int pin) {
-  return (pin >= 0 && pin <= (int) (sizeof(s_pins) / sizeof(s_pins[0])))
+  return (pin >= 0 && pin < (int) (sizeof(s_pins) / sizeof(s_pins[0])))
              ? s_pins[pin]
              : false;
 }
diff --git a/examples/mqtt-dashboard/device/net.c b/examples/mqtt-dashboard/device/net.c
index f9f22e36..ce3495c8 100644
--- a/examples/mqtt-dashboard/device/net.c
+++ b/examples/mqtt-dashboard/device/net.c
@@ -111,9 +111,9 @@ static void rpc_config_set(struct mg_rpc_req *r) {
   }
 
   tmp_pin = (int8_t) mg_json_get_long(r->frame, "$.params.led_pin", -1);
-  if (tmp_pin > 0) s_device_config.led_pin = tmp_pin;
+  if (tmp_pin >= 0) s_device_config.led_pin = tmp_pin;
 
-  if (tmp_pin > 0 && ok) {
+  if (tmp_pin >= 0 && ok) {
     hal_gpio_write(s_device_config.led_pin, s_device_config.led_status);
   }