diff --git a/platform/esb/dev/radio-sensor.c b/platform/esb/dev/radio-sensor.c
index cf4e29469..3ea6adc84 100644
--- a/platform/esb/dev/radio-sensor.c
+++ b/platform/esb/dev/radio-sensor.c
@@ -28,13 +28,15 @@
  *
  * This file is part of the Contiki operating system.
  *
- * @(#)$Id: radio-sensor.c,v 1.1 2006/06/18 07:49:33 adamdunkels Exp $
+ * @(#)$Id: radio-sensor.c,v 1.2 2006/10/09 11:55:42 adamdunkels Exp $
  */
 
 #include "contiki-esb.h"
 #include "dev/irq.h"
 #include <io.h>
 
+#include "dev/tr1001.h"
+
 const struct sensors_sensor radio_sensor;
 
 unsigned int radio_sensor_signal;
@@ -78,7 +80,13 @@ active(void)
 static unsigned int
 value(int type)
 {
-  return radio_sensor_signal;
+  switch(type) {
+  case RADIO_SENSOR_LAST_PACKET:
+    return tr1001_sstrength();
+  case RADIO_SENSOR_LAST_VALUE:
+  default:
+    return radio_sensor_signal;
+  }
 }
 /*---------------------------------------------------------------------------*/
 static int
diff --git a/platform/esb/dev/radio-sensor.h b/platform/esb/dev/radio-sensor.h
index 862c51476..0a69ef717 100644
--- a/platform/esb/dev/radio-sensor.h
+++ b/platform/esb/dev/radio-sensor.h
@@ -28,7 +28,7 @@
  *
  * This file is part of the Contiki operating system.
  *
- * @(#)$Id: radio-sensor.h,v 1.1 2006/06/18 07:49:33 adamdunkels Exp $
+ * @(#)$Id: radio-sensor.h,v 1.2 2006/10/09 11:55:42 adamdunkels Exp $
  */
 #ifndef __RADIO_SENSOR_H__
 #define __RADIO_SENSOR_H__
@@ -37,6 +37,9 @@
 
 extern const struct sensors_sensor radio_sensor;
 
+#define RADIO_SENSOR_LAST_VALUE  0
+#define RADIO_SENSOR_LAST_PACKET 1
+
 #define RADIO_SENSOR "Radio"
 
 extern unsigned int radio_sensor_signal;