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diff --git a/src/electronics/components/meter.h b/src/electronics/components/meter.h
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+/***************************************************************************
+ *   Copyright (C) 2005 by David Saxton                                    *
+ *   [email protected]                                                    *
+ *                                                                         *
+ *   This program is free software; you can redistribute it and/or modify  *
+ *   it under the terms of the GNU General Public License as published by  *
+ *   the Free Software Foundation; either version 2 of the License, or     *
+ *   (at your option) any later version.                                   *
+ ***************************************************************************/
+
+#ifndef METER_H
+#define METER_H
+
+#include <component.h>
+
+/**
+@author David Saxton
+*/
+class Meter : public Component
+{
+public:
+	Meter( ICNDocument *icnDocument, bool newItem, const char *id );
+	~Meter();
+	
+	virtual void stepNonLogic();
+	virtual bool doesStepNonLogic() const { return true; }
+	virtual void drawShape( QPainter &p );
+	
+protected:
+	QString displayText();
+	virtual void dataChanged();
+	/**
+	 * Return the value / current, or whatever the meter is measuring
+	 */
+	virtual double meterValue() = 0;
+	
+	bool b_firstRun; // If true, then update the text dispalyed
+	bool b_timerStarted; // The timer to change the text is started on change
+	double m_timeSinceUpdate;
+	double m_avgValue;
+	double m_old_value;
+	double m_minValue;
+	double m_maxValue;
+	Text *p_displayText;
+	QString m_unit;
+};
+
+/**
+@short Measures the frequency at a point in the circuit
+@author David Saxton
+*/
+class FrequencyMeter : public Meter
+{
+public:
+	FrequencyMeter( ICNDocument *icnDocument, bool newItem, const char *id = 0L );
+	~FrequencyMeter();
+	
+	static Item* construct( ItemDocument *itemDocument, bool newItem, const char *id );
+	static LibraryItem *libraryItem();
+	
+protected:
+	virtual double meterValue();
+	ECNode *m_probeNode;
+};
+
+/**
+@short Simple resistor
+@author David Saxton
+*/
+class ECAmmeter : public Meter
+{
+public:
+	ECAmmeter( ICNDocument *icnDocument, bool newItem, const char *id = 0L );
+	~ECAmmeter();
+	
+	static Item* construct( ItemDocument *itemDocument, bool newItem, const char *id );
+	static LibraryItem *libraryItem();
+	
+protected:
+	virtual double meterValue();
+
+private:
+	VoltageSource *m_voltageSource;
+};
+
+/**
+@short Displays voltage across terminals
+@author David Saxton
+*/
+class ECVoltMeter : public Meter
+{
+public:
+	ECVoltMeter( ICNDocument *icnDocument, bool newItem, const char *id = 0L );
+	~ECVoltMeter();
+	
+	static Item* construct( ItemDocument *itemDocument, bool newItem, const char *id );
+	static LibraryItem *libraryItem();
+	
+protected:
+	virtual double meterValue();
+};
+
+#endif