diff --git a/platform/sky/Makefile.sky b/platform/sky/Makefile.sky
index 755c5998a..0262bcb85 100644
--- a/platform/sky/Makefile.sky
+++ b/platform/sky/Makefile.sky
@@ -1,8 +1,8 @@
-# $Id: Makefile.sky,v 1.26 2009/06/26 12:00:49 joxe Exp $
+# $Id: Makefile.sky,v 1.27 2009/08/25 16:24:49 adamdunkels Exp $
 
 
 ARCH=msp430.c leds.c watchdog.c light.c spi.c ds2411.c \
-     xmem.c i2c.c sht11.c battery-sensor.c acc-sensor.c \
+     xmem.c i2c.c sht11.c battery-sensor.c acc-sensor.c ext-sensor.c \
      cc2420.c cc2420-aes.c cc2420-arch.c irq.c \
      node-id.c sensors.c button-sensor.c cfs-coffee.c \
      radio-sensor.c uart1.c uip-ipchksum.c \
diff --git a/platform/sky/dev/ext-sensor.c b/platform/sky/dev/ext-sensor.c
new file mode 100644
index 000000000..f3639ee8c
--- /dev/null
+++ b/platform/sky/dev/ext-sensor.c
@@ -0,0 +1,149 @@
+/*
+ * Copyright (c) 2006, Swedish Institute of Computer Science.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. Neither the name of the Institute nor the names of its contributors
+ *    may be used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ *
+ * $Id: ext-sensor.c,v 1.1 2009/08/25 16:24:49 adamdunkels Exp $
+ *
+ * -----------------------------------------------------------------
+ *
+ * Author  : Adam Dunkels, Joakim Eriksson, Niclas Finne, Marcus Lundén
+ * Created : 2005-11-01
+ * Updated : $Date: 2009/08/25 16:24:49 $
+ *           $Revision: 1.1 $
+ */
+
+#include "dev/ext-sensor.h"
+#include <io.h>
+#include "dev/irq.h"
+
+#include <stdio.h>
+
+const struct sensors_sensor ext_sensor;
+
+/*---------------------------------------------------------------------------*/
+static void
+init(void)
+{
+
+}
+/*---------------------------------------------------------------------------*/
+static int
+irq(void)
+{
+  return 0;
+}
+/*---------------------------------------------------------------------------*/
+static void
+activate(void)
+{
+  /* This assumes that some other sensor system already did setup the ADC */
+  /* (in the case of the JCreate platform it is sensors_light_init before */
+  /* acc.meter that does it) */
+
+  /* P6.0 and P6.1 are inputs and peripheral function (A0, A1) selected */
+  /* P6SEL |= (1<<P6.0)|(1<<P6.1);*/
+  P6SEL |= 0x03;
+  P6DIR = 0x00;
+  P6OUT = 0x00;
+
+
+  /* stop converting immediately in order to be able to write to registers */
+  ADC12CTL0 &= ~ENC;
+  ADC12CTL1 &= ~CONSEQ_3;
+
+  /* Make sure that previous ADCMEM isn't EOS */
+  ADC12MCTL5 &= ~(EOS);
+  /* We want full voltage range, therefore +ref=Vcc and -ref=GND */
+  /* MemReg6 == P6.0/A0 == port "under" logo */
+  ADC12MCTL6 = (INCH_0 | SREF_0);
+  /* MemReg7 == P6.1/A1 == port "over" logo , End Of (ADC-)Sequence */
+  ADC12MCTL7 = (INCH_1 | SREF_0 | EOS);
+
+  /* Start ADC again */
+  ADC12CTL1 |= CONSEQ_3;
+  ADC12CTL0 |= ENC | ADC12SC;
+
+  /*  Irq_adc12_activate(&ext_sensor, 6, (INCH_11 + SREF_1)); */
+}
+/*---------------------------------------------------------------------------*/
+static void
+deactivate(void)
+{
+  /* stop converting immediately in order to be able to write to registers */
+  ADC12CTL0 &= ~ENC;
+  ADC12CTL1 &= ~CONSEQ_3;
+
+  /* Prev ADCMEM == EOS */
+  ADC12MCTL5 |= EOS;
+
+  /* Start ADC again */
+  ADC12CTL1 |= CONSEQ_3;
+  ADC12CTL0 |= ENC | ADC12SC;
+
+  /*  irq_adc12_deactivate(&ext_sensor, 6);
+      ext_value = 0;*/
+}
+/*---------------------------------------------------------------------------*/
+static int
+active(void)
+{
+  /* If previous ADCmem (5) has not EOS set, then extension ports are active */
+  if ((ADC12MCTL5&&EOS) == 0)
+  {
+    return 1;
+  }
+  else return (0); /* irq_adc12_active(6);*/
+}
+/*---------------------------------------------------------------------------*/
+static unsigned int
+value(int type)
+{
+  /* value(0) corresponds to the port under the logo, value(1) to the port over the logo */
+  switch(type) {
+  case 0:
+    return ADC12MEM6;
+  case 1:
+    return ADC12MEM7;
+  }
+  return 0;
+}
+/*---------------------------------------------------------------------------*/
+static int
+configure(int type, void *c)
+{
+  return 0;
+}
+/*---------------------------------------------------------------------------*/
+static void *
+status(int type)
+{
+  return NULL;
+}
+/*---------------------------------------------------------------------------*/
+SENSORS_SENSOR(ext_sensor, EXT_SENSOR,
+	       init, irq, activate, deactivate, active,
+	       value, configure, status);
diff --git a/platform/sky/dev/ext-sensor.h b/platform/sky/dev/ext-sensor.h
new file mode 100644
index 000000000..159ac30a7
--- /dev/null
+++ b/platform/sky/dev/ext-sensor.h
@@ -0,0 +1,48 @@
+/*
+ * Copyright (c) 2006, Swedish Institute of Computer Science.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. Neither the name of the Institute nor the names of its contributors
+ *    may be used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ *
+ * $Id: ext-sensor.h,v 1.1 2009/08/25 16:24:49 adamdunkels Exp $
+ *
+ * -----------------------------------------------------------------
+ *
+ * Author  : Marcus Lundén
+ * Created : 2005-11-01
+ * Updated : $Date: 2009/08/25 16:24:49 $
+ *           $Revision: 1.1 $
+ */
+
+#ifndef __EXT_SENSOR_H__
+#define __EXT_SENSOR_H__
+
+#include "lib/sensors.h"
+
+extern const struct sensors_sensor ext_sensor;
+
+#define EXT_SENSOR "Ext"
+
+#endif /* __EXT_SENSOR_H__ */