diff --git a/examples/sky/Makefile b/examples/sky/Makefile
index aba2bb3a1..f66dff5a1 100644
--- a/examples/sky/Makefile
+++ b/examples/sky/Makefile
@@ -11,4 +11,10 @@ all: blink sky-collect #rt-leds test-button test-cfs tcprudolph0
 	echo $(basename $<)/$(basename $<).ihex 600 > $(basename $<)/runfile ; \
 	tar czf $@ $(basename $<)
 
+%.class: %.java
+	javac $(basename $<).java
+
+viewrssi: ViewRSSI.class
+	make login | java ViewRSSI
+
 include $(CONTIKI)/Makefile.include
diff --git a/examples/sky/ViewRSSI.java b/examples/sky/ViewRSSI.java
new file mode 100644
index 000000000..6451eb560
--- /dev/null
+++ b/examples/sky/ViewRSSI.java
@@ -0,0 +1,86 @@
+/**
+ * RSSI Viewer - view RSSI values of 802.15.4 channels
+ * ---------------------------------------------------
+ * Note: run the rssi-scanner on a Sky or sentilla node connected to USB
+ * then start with
+ * make login | java ViewRSSI
+ *
+ * Created: Fri Apr 24 00:40:01 2009, Joakim Eriksson
+ *
+ * @author Joakim Eriksson, SICS
+ * @version 1.0
+ */
+import javax.swing.*;
+import java.awt.*;
+import java.io.*;
+public class ViewRSSI extends JPanel {
+
+  private int[] rssi = new int[80];
+  private int[] rssiMax = new int[80];
+
+  /* this is the max value of the RSSI from the cc2420 */
+  private static final int RSSI_MAX_VALUE = 200;
+
+  public ViewRSSI() {
+  }
+
+  public void paint(Graphics g) {
+    int h = getHeight();
+    int w = getWidth();
+    g.clearRect(0, 0, 300, h);
+    double factor = (h - 20.0) / RSSI_MAX_VALUE;
+    double sSpacing = (w - 15 ) / 80.0;
+    int sWidth = (int) (sSpacing - 1);
+    if (sWidth == 0) sWidth = 1;
+
+    g.setColor(Color.gray);
+    double xpos = 10;
+    for (int i = 0, n = rssi.length; i < n; i++) {
+      int rssi = (int) (rssiMax[i] * factor);
+      g.fillRect((int) xpos, h - 20 - rssi,
+		 sWidth, rssi + 1);
+      xpos += sSpacing;
+    }
+
+    g.setColor(Color.black);
+    xpos = 10;
+    for (int i = 0, n = rssi.length; i < n; i++) {
+      int rssiVal = (int) (rssi[i] * factor);
+      g.fillRect((int) xpos, h - 20 - rssiVal,
+		 sWidth, rssiVal + 1);
+      xpos += sSpacing;
+    }
+  }
+
+  private void handleInput() throws IOException {
+    BufferedReader reader =
+      new BufferedReader(new InputStreamReader(System.in));
+    while(true) {
+      String line = reader.readLine();
+      if (line.startsWith("RSSI:")) {
+	try {
+	  String[] parts = line.split(" ");
+	  for (int i = 1, n = parts.length; i < n; i++) {
+	    rssi[i] = 3 * Integer.parseInt(parts[i]);
+	    if (rssi[i] > rssiMax[i]) rssiMax[i] = rssi[i];
+	    else if (rssiMax[i] > 0) rssiMax[i]--;
+	  }
+	} catch (Exception e) {
+	  /* report but do not fail... */
+	  e.printStackTrace();
+	}
+	repaint();
+      }
+    }
+  }
+
+  public static void main(String[] args) throws IOException {
+    JFrame win = new JFrame("RSSI Viewer");
+    ViewRSSI panel;
+    win.setBounds(10, 10, 300, 300);
+    win.getContentPane().add(panel = new ViewRSSI());
+    win.setVisible(true);
+
+    panel.handleInput();
+  }
+}
diff --git a/examples/sky/rssi-scanner.c b/examples/sky/rssi-scanner.c
new file mode 100644
index 000000000..5a0fffcbb
--- /dev/null
+++ b/examples/sky/rssi-scanner.c
@@ -0,0 +1,93 @@
+/*
+ * Copyright (c) 2007, 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.
+ *
+ * This file is part of the Contiki operating system.
+ *
+ * $Id: rssi-scanner.c,v 1.1 2009/04/25 09:41:37 joxe Exp $
+ */
+
+/**
+ * \file
+ *         Scanning 2.4 GHz radio frequencies using CC2420 and prints
+ *         the values
+ * \author
+ *         Joakim Eriksson, joakime@sics.se
+ */
+
+#include "contiki.h"
+#include "net/rime.h"
+
+#include "dev/leds.h"
+#include "dev/cc2420.h"
+#include "dev/cc2420_const.h"
+#include "dev/spi.h"
+#include <stdio.h>
+
+/*---------------------------------------------------------------------------*/
+/* This assumes that the CC2420 is always on and "stable" */
+static void
+set_frq(int c)
+{
+  int f;
+  /* fine graied channel - can we even read other channels with CC2420 ? */
+  f = c + 302 + 0x4000;
+
+  FASTSPI_SETREG(CC2420_FSCTRL, f);
+  FASTSPI_STROBE(CC2420_SRXON);
+}
+
+static void
+do_rssi(void)
+{
+  int channel;
+  printf("RSSI:");
+  for(channel = 0; channel <= 79; ++channel) {
+    set_frq(channel + 55);
+    printf("%d ", cc2420_rssi() + 53);
+  }
+  printf("\n");
+}
+
+/*---------------------------------------------------------------------------*/
+PROCESS(scanner_process, "RSSI Scanner");
+AUTOSTART_PROCESSES(&scanner_process);
+/*---------------------------------------------------------------------------*/
+PROCESS_THREAD(scanner_process, ev, data)
+{
+  PROCESS_BEGIN();
+  /* switch mac layer off, and turn radio on */
+  rime_mac->off(0);
+  cc2420_on();
+
+  while(1) {
+    do_rssi();
+  }
+
+  PROCESS_END();
+}
+/*---------------------------------------------------------------------------*/