diff --git a/firmware/weather_station.ino b/firmware/weather_station.ino
index 51fbf7f..76ce878 100644
--- a/firmware/weather_station.ino
+++ b/firmware/weather_station.ino
@@ -4,7 +4,13 @@
  *  It can measure wind speed, wind gust , wind direction, rain fall, temperature,
  *  humidity and air pressure and has an RS-485 ModBus interface for your convenience. 
  *
- * (C)2023 M.T. Konstapel https://meezenest.nl/mees
+ *  LED on Arduino gives status:
+ *
+ *       ON    : Booting
+ *       BLINK : I2C ERROR
+ *       FLASH : Heartbeat
+ *
+ * Copyright (C) 2023 M.T. Konstapel https://meezenest.nl/mees
  *
  * This file is part of weather_station
  *
@@ -29,10 +35,14 @@
 #include <Wire.h>
 #include "i2c.h"
 
-//Temperature and humidit sensor
+//Temperature and humidity sensor
 #include "i2c_SI7021.h"
 SI7021 si7021;
 
+// Pressure sensor
+#include "i2c_BMP280.h"
+BMP280 bmp280;
+
 /**************************/
 /* Configurable variables */
 /**************************/
@@ -137,6 +147,25 @@ void ReadSi7021 (void)
 
 }
 
+// Read BMP280
+void ReadBMP280 (void)
+{
+  MeasuredData.Pressure=0;
+/*
+  bmp280.awaitMeasurement();
+
+  float temperature;
+  bmp280.getTemperature(temperature);
+
+  float pascal;
+  bmp280.getPressure(pascal);
+
+  MeasuredData.Pressure = pascal;
+
+  bmp280.triggerMeasurement();
+*/
+}
+
 int MaxOfArray (int array[], unsigned int length)
 {
   int maximum_value = 0;
@@ -254,6 +283,10 @@ void setup() {
   // prefer the line below instead if possible
   // MySerial.begin (Baudrate, MB_PARITY_EVEN);
 
+  // initialize digital pin LED_BUILTIN as an output and turn it on.
+  pinMode(LED_BUILTIN, OUTPUT);
+  digitalWrite(LED_BUILTIN, HIGH);
+
   //Setup control lines for RS485 driver
   pinMode(RS485_RE,INPUT);        // In hardware connected to RS485_DE. Should be input to prevent a short circuit!
   pinMode(RS485_DE,OUTPUT);
@@ -276,7 +309,9 @@ void setup() {
     
   // Set Weather station ID
   mb.Ireg (SensorIDIreg, 0x5758);
-
+  // Set unused register to zero
+  mb.Ireg (SensorRainSinceMidnightIreg, 0);
+ 
   Serial.println(F("Weather station"));
 
   //Initialize Si7021 sensor
@@ -286,9 +321,33 @@ void setup() {
   else
   {
     Serial.println(F("missing"));
-    while(1) {};
+    while(1) {
+      digitalWrite(LED_BUILTIN, HIGH);  // turn the LED on (HIGH is the voltage level)
+      delay(500);                      // wait for half a second
+      digitalWrite(LED_BUILTIN, LOW);   // turn the LED off by making the voltage LOW
+      delay(500);  
+    }
+  }
+
+/*  // Initialize BMP280 pressure sensor
+  Serial.print(F("Pressure sensor BMP280 "));
+  if (bmp280.initialize())   
+    Serial.println(F("found"));
+  else
+  {
+    Serial.println(F("missing"));
+    while(1) {
+      digitalWrite(LED_BUILTIN, HIGH);  // turn the LED on (HIGH is the voltage level)
+      delay(500);                      // wait for half a second
+      digitalWrite(LED_BUILTIN, LOW);   // turn the LED off by making the voltage LOW
+      delay(500);  
+    }
   }
 
+  // onetime-measure:
+  bmp280.setEnabled(0);
+  bmp280.triggerMeasurement();
+*/
     // Expected ADC values have been defined for various platforms in the
     // library, however your platform may not be included. This code will check
     // if that's the case
@@ -299,11 +358,11 @@ void setup() {
     // resolution, so you'll need to specify it here:
     weatherMeterKit.setADCResolutionBits(10);
 #endif
-    // Begin weather meter kit
-    weatherMeterKit.begin();
+  // Begin weather meter kit
+  weatherMeterKit.begin();
 
-   ts = millis();
-   RainPerHourCounter = ts;
+  ts = millis();
+  RainPerHourCounter = ts;
 }
 
 void loop() {
@@ -316,9 +375,14 @@ void loop() {
     
     ts = millis();
 
+    digitalWrite(LED_BUILTIN, HIGH);  // LED as heartbeat
+
     // Read temperature and humidity
     ReadSi7021();
 
+    // Read pressure and temperature
+    ReadBMP280();
+
     // Read Wind and rain
     ReadSparkfunWeatherStation();
 
@@ -330,6 +394,10 @@ void loop() {
     mb.Ireg (SensorRainLast24Ireg, MeasuredData.RainLast24);
     mb.Ireg (SensorTemperatureIreg, MeasuredData.Temperature);
     mb.Ireg (SensorHumidityIreg, MeasuredData.Humidity);
+    mb.Ireg (SensorPressureIreg, MeasuredData.Pressure);
+
+    digitalWrite(LED_BUILTIN, LOW);  // LED as heartbeat
+
 
     }
 }
\ No newline at end of file
diff --git a/hardware/ds-15901_interface/ds-15901_interface-backups/ds-15901_interface-2023-12-29_153821.zip b/hardware/ds-15901_interface/ds-15901_interface-backups/ds-15901_interface-2023-12-29_153821.zip
new file mode 100644
index 0000000..a299f87
Binary files /dev/null and b/hardware/ds-15901_interface/ds-15901_interface-backups/ds-15901_interface-2023-12-29_153821.zip differ
diff --git a/hardware/ds-15901_interface/ds-15901_interface.kicad_sch b/hardware/ds-15901_interface/ds-15901_interface.kicad_sch
index d39533a..0138b18 100644
--- a/hardware/ds-15901_interface/ds-15901_interface.kicad_sch
+++ b/hardware/ds-15901_interface/ds-15901_interface.kicad_sch
@@ -6,7 +6,7 @@
 
   (title_block
     (title "DS-15901 weather station interface with RS-485 ModBus")
-    (date "2023-12-23")
+    (date "2023-12-29")
     (rev "A")
     (company "Mees Electronics")
     (comment 1 "M.T. Konstapel")
diff --git a/test_software/__pycache__/epever_control.cpython-36.pyc b/test_software/__pycache__/epever_control.cpython-36.pyc
index 4b42c6b..2952807 100644
Binary files a/test_software/__pycache__/epever_control.cpython-36.pyc and b/test_software/__pycache__/epever_control.cpython-36.pyc differ
diff --git a/test_software/weather_station_rs485_client.py b/test_software/weather_station_rs485_client.py
index 175e589..5509005 100644
--- a/test_software/weather_station_rs485_client.py
+++ b/test_software/weather_station_rs485_client.py
@@ -607,6 +607,7 @@ else:
         rawdat['Rain last 24 hours'] = controller.get_rain_last24()
         rawdat['Temperature'] = controller.get_temperature()
         rawdat['Humidity'] = controller.get_humidity()
+        rawdat['Pressure'] = controller.get_pressure()
 
         print (json.dumps(rawdat, indent=1, sort_keys=False))