diff --git a/fw/Core/Src/main.c b/fw/Core/Src/main.c
index 93725c2..064a409 100644
--- a/fw/Core/Src/main.c
+++ b/fw/Core/Src/main.c
@@ -381,10 +381,9 @@ int main(void)
 		  if (CO2 <= sensor_config.led_co2_alert_limit1)
 		  {
 			  /* CO2 is OK -> BLUE */
-			  /* TODO: Decide if blue or green */
 			  LL_GPIO_SetOutputPin(LED_R_GPIO_Port, LED_R_Pin);
-			  LL_GPIO_SetOutputPin(LED_G_GPIO_Port, LED_G_Pin);
-			  LL_GPIO_ResetOutputPin(LED_B_GPIO_Port, LED_B_Pin);
+			  LL_GPIO_ResetOutputPin(LED_G_GPIO_Port, LED_G_Pin);
+			  LL_GPIO_SetOutputPin(LED_B_GPIO_Port, LED_B_Pin);
 
 		  } else if ((sensor_config.led_co2_alert_limit1 < CO2) && (CO2 <= sensor_config.led_co2_alert_limit2))
 		  {
@@ -603,7 +602,7 @@ static void MX_LPUART1_UART_Init(void)
 	  /* USER CODE BEGIN LPUART1_Init 1 */
 
 	  /* USER CODE END LPUART1_Init 1 */
-	  LPUART_InitStruct.BaudRate = 115200;
+	  LPUART_InitStruct.BaudRate = 19200;
 	  LPUART_InitStruct.DataWidth = LL_LPUART_DATAWIDTH_9B;
 	  LPUART_InitStruct.StopBits = LL_LPUART_STOPBITS_1;
 	  LPUART_InitStruct.Parity = LL_LPUART_PARITY_EVEN;
diff --git a/fw/Core/Src/sht4x.c b/fw/Core/Src/sht4x.c
index fd5bdd5..554da83 100644
--- a/fw/Core/Src/sht4x.c
+++ b/fw/Core/Src/sht4x.c
@@ -30,7 +30,7 @@ int8_t sht4x_measure(int16_t *temperature, uint16_t *relative_humidity)
 	if (result != I2C_OK) {
 		return SHT4X_ERROR;
 	}*/
-	LL_mDelay(100); // 10 ms should be enough
+	LL_mDelay(10); // 10 ms should be enough
 	// read out
 	result = i2c_receive(SHT4X_I2C_ADDRESS<<1, buffer, 6);
 	if (result != I2C_OK) {
diff --git a/tests/minimalmodbus_test.py b/tests/minimalmodbus_test.py
index 5bb9eeb..999ae00 100755
--- a/tests/minimalmodbus_test.py
+++ b/tests/minimalmodbus_test.py
@@ -6,11 +6,11 @@ import serial
 slave_address = 254
 instrument = minimalmodbus.Instrument('/dev/ttyUSB0', slave_address, close_port_after_each_call=True)  # port name, slave address (in decimal)
 
-instrument.serial.baudrate = 115200
+instrument.serial.baudrate = 19200
 instrument.serial.bytesize = 8
 instrument.serial.parity   = serial.PARITY_EVEN
 instrument.serial.stopbits = 1
-instrument.serial.timeout  = 0.1          # seconds
+instrument.serial.timeout  = 0.05          # seconds
 instrument.mode = minimalmodbus.MODE_RTU   # rtu or ascii mode
 instrument.clear_buffers_before_each_transaction = True