diff --git a/examples/UserDataDemo/UserDataDemo.ino b/examples/UserDataDemo/UserDataDemo.ino
new file mode 100644
index 0000000..4cd6d25
--- /dev/null
+++ b/examples/UserDataDemo/UserDataDemo.ino
@@ -0,0 +1,115 @@
+//
+// FILE: UserDataDemo.ino
+// AUTHOR: Rob Tillaart
+// VERSION: 0.1.0
+// PURPOSE: use of alarm field as user identification demo
+// DATE: 2019-12-23
+// URL:
+//
+// Released to the public domain
+//
+
+#include <OneWire.h>
+#include <DallasTemperature.h>
+
+#define ONE_WIRE_BUS      2
+
+OneWire oneWire(ONE_WIRE_BUS);
+DallasTemperature sensors(&oneWire);
+
+uint8_t deviceCount = 0;
+
+// Add 4 prepared sensors to the bus
+// use the UserDataWriteBatch demo to prepare 4 different labeled sensors
+struct
+{
+  int id;
+  DeviceAddress addr;
+} T[4];
+
+float getTempByID(int id)
+{
+  for (uint8_t index = 0; index < deviceCount; index++)
+  {
+    if (T[index].id == id)
+    {
+      return sensors.getTempC(T[index].addr);
+    }
+  }
+  return -999;
+}
+
+void printAddress(DeviceAddress deviceAddress)
+{
+  for (uint8_t i = 0; i < 8; i++)
+  {
+    // zero pad the address if necessary
+    if (deviceAddress[i] < 16) Serial.print("0");
+    Serial.print(deviceAddress[i], HEX);
+  }
+}
+
+void setup(void)
+{
+  Serial.begin(115200);
+  Serial.println(__FILE__);
+  Serial.println("Dallas Temperature Demo");
+
+  sensors.begin();
+  
+  // count devices
+  deviceCount = sensors.getDeviceCount();
+  Serial.print("#devices: ");
+  Serial.println(deviceCount);
+
+  // Read ID's per sensor
+  // and put them in T array
+  for (uint8_t index = 0; index < deviceCount; index++)
+  {
+    // go through sensors
+    sensors.getAddress(T[index].addr, index);
+    T[index].id = sensors.getUserData(T[index].addr);
+  }
+
+  // Check all 4 sensors are set
+  for (uint8_t index = 0; index < deviceCount; index++)
+  {
+    Serial.println();
+    Serial.println(T[index].id);
+    printAddress(T[index].addr);
+    Serial.println();
+  }
+  Serial.println();
+
+}
+
+
+void loop(void)
+{
+  Serial.println();
+  Serial.print(millis());
+  Serial.println("\treq temp");
+  sensors.requestTemperatures();
+
+  Serial.print(millis());
+  Serial.println("\tGet temp by address");
+  for (int i = 0; i < 4; i++)
+  {
+    Serial.print(millis());
+    Serial.print("\t temp:\t");
+    Serial.println(sensors.getTempC(T[i].addr));
+  }
+
+  Serial.print(millis());
+  Serial.println("\tGet temp by ID");  // assume ID = 0, 1, 2, 3
+  for (int id = 0; id < 4; id++)
+  {
+    Serial.print(millis());
+    Serial.print("\t temp:\t");
+    Serial.println(getTempByID(id));
+  }
+
+  delay(1000);
+}
+
+// END OF FILE
\ No newline at end of file
diff --git a/examples/UserDataWriteBatch/UserDataWriteBatch.ino b/examples/UserDataWriteBatch/UserDataWriteBatch.ino
new file mode 100644
index 0000000..b59f33b
--- /dev/null
+++ b/examples/UserDataWriteBatch/UserDataWriteBatch.ino
@@ -0,0 +1,107 @@
+//
+// FILE: UserDataWriteBatch.ino
+// AUTHOR: Rob Tillaart
+// VERSION: 0.1.0
+// PURPOSE: use of alarm field as user identification demo
+// DATE: 2019-12-23
+// URL:
+//
+// Released to the public domain
+//
+
+#include <OneWire.h>
+#include <DallasTemperature.h>
+
+#define ONE_WIRE_BUS      2
+
+OneWire oneWire(ONE_WIRE_BUS);
+DallasTemperature sensors(&oneWire);
+
+uint8_t deviceCount = 0;
+
+void printAddress(DeviceAddress deviceAddress)
+{
+  for (uint8_t i = 0; i < 8; i++)
+  {
+    // zero pad the address if necessary
+    if (deviceAddress[i] < 16) Serial.print("0");
+    Serial.print(deviceAddress[i], HEX);
+  }
+}
+
+
+
+void setup(void)
+{
+  Serial.begin(115200);
+  Serial.println(__FILE__);
+  Serial.println("Write user ID to DS18B20\n");
+
+  sensors.begin();
+
+  // count devices
+  deviceCount = sensors.getDeviceCount();
+  Serial.print("#devices: ");
+  Serial.println(deviceCount);
+  
+  Serial.println();
+  Serial.println("current ID's");
+  for (uint8_t index = 0; index < deviceCount; index++)
+  {
+    DeviceAddress t;
+    sensors.getAddress(t, index);
+    printAddress(t);
+    Serial.print("\t\tID: ");
+    int id = sensors.getUserData(t);
+    Serial.println(id);
+  }
+  
+  Serial.println();
+  Serial.print("Enter ID for batch: ");
+  int c = 0;
+  int id = 0;
+  while (c != '\n' && c != '\r')
+  {
+    c = Serial.read();
+    switch(c)
+    {
+    case '0'...'9':
+      id *= 10;
+      id += (c - '0');
+      break;
+    default:
+      break;
+    }
+  }
+  Serial.println();
+  Serial.println(id);
+  Serial.println();
+
+  Serial.println("Start labeling ...");
+  for (uint8_t index = 0; index < deviceCount; index++)
+  {
+    Serial.print(".");
+    DeviceAddress t;
+    sensors.getAddress(t, index);
+    sensors.setUserData(t, id);
+  }
+  Serial.println();
+
+  Serial.println();
+  Serial.println("Show results ...");
+  for (uint8_t index = 0; index < deviceCount; index++)
+  {
+    DeviceAddress t;
+    sensors.getAddress(t, index);
+    printAddress(t);
+    Serial.print("\t\tID: ");
+    int id = sensors.getUserData(t);
+    Serial.println(id);
+  }
+  Serial.println("Done ...");
+
+}
+
+void loop(void) {}
+
+// END OF FILE
\ No newline at end of file