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diff --git a/tos/lib/TOSBoot/micaz/VoltageC.nc b/tos/lib/TOSBoot/micaz/VoltageC.nc
new file mode 100644
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+++ b/tos/lib/TOSBoot/micaz/VoltageC.nc
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+// $Id$
+
+/*									tab:2
+ *
+ *
+ * "Copyright (c) 2000-2004 The Regents of the University  of California.  
+ * All rights reserved.
+ *
+ * Permission to use, copy, modify, and distribute this software and its
+ * documentation for any purpose, without fee, and without written agreement is
+ * hereby granted, provided that the above copyright notice, the following
+ * two paragraphs and the author appear in all copies of this software.
+ * 
+ * IN NO EVENT SHALL THE UNIVERSITY OF CALIFORNIA BE LIABLE TO ANY PARTY FOR
+ * DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES ARISING OUT
+ * OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN IF THE UNIVERSITY OF
+ * CALIFORNIA HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ * 
+ * THE UNIVERSITY OF CALIFORNIA SPECIFICALLY DISCLAIMS ANY WARRANTIES,
+ * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
+ * AND FITNESS FOR A PARTICULAR PURPOSE.  THE SOFTWARE PROVIDED HEREUNDER IS
+ * ON AN "AS IS" BASIS, AND THE UNIVERSITY OF CALIFORNIA HAS NO OBLIGATION TO
+ * PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS."
+ *
+ */
+
+/**
+ * @author Jonathan Hui <jwhui@cs.berkeley.edu>
+ */
+
+module VoltageC {
+  provides {
+    interface Voltage;
+  }
+}
+
+implementation {
+
+  command bool Voltage.okToProgram() {
+
+    // 250 KHz ADC clock (4MHz/16)
+    outp( 0x04, ADCSR );
+    // clear interrupt flag by writing a 1
+    sbi( ADCSR, ADIF );
+    // setup input channel
+    outp( VOLTAGE_PORT, ADMUX );
+    // adc enable
+    sbi( ADCSR, ADEN );
+    // adc start conversion
+    sbi( ADCSR, ADSC );
+    // wait for conversion to complete
+    while ( !bit_is_set( ADCSR, ADIF ) );
+
+    return ( __inw(ADCL) < VTHRESH  );
+
+  }
+
+}