diff --git a/lib/oled_ssd1306.c b/lib/oled_ssd1306.c
index 64d60ec..cf57871 100644
--- a/lib/oled_ssd1306.c
+++ b/lib/oled_ssd1306.c
@@ -42,6 +42,9 @@
 
 bool oled_ssd1306_setup(void)
 {
+	if (!i2c_master_check_signals(OLED_SSD1306_I2C)) { // check if there are pull-ups to operator I2C
+		return false;
+	}
 	i2c_master_setup(OLED_SSD1306_I2C, 400); // setup I2C bus ( SSD1306 supports an I2C cleck up to 400 kHz)
 	const uint8_t oled_init[] = {
 		0x00, // control byte: continuous (multiple byes), command