diff --git a/modules/@amperka/crastandrum.js b/modules/@amperka/crastandrum.js
new file mode 100644
index 0000000..19efee9
--- /dev/null
+++ b/modules/@amperka/crastandrum.js
@@ -0,0 +1,69 @@
+//Library for use Drum with Piezo element and MIDI signals.
+//Wiki at https://gitlab.com/espruinolibs/MidiLibs/wikis/home
+
+function min(a,b)
+{
+	if(a<b) return Math.round(a);
+	else return Math.round(b);
+}
+
+function Output1(channel,note,max,serial,c)
+{
+	serial.write(0x90+channel);
+	serial.write(note);
+	serial.write(min(max*127*c,127));	
+}
+
+function Output2(channel,note,serial)
+{
+	serial.write(0x80+channel);
+	serial.write(note);
+	serial.write(0);
+	
+}
+
+var Drum = function(pin, interval, delay, limit, serial, channel, note, size_const) {
+	this.size_const=size_const;
+	this.limit=limit;
+	this._pin=pin;
+	this.interval=interval;
+	this._delay=delay;
+	this._pin.mode("analog");
+	this.Time;
+	this.bit = false;
+	this.delay = false;
+	this.note=note;
+	this.serial=serial;
+	this.channel=channel;
+	this.obj={pin:this._pin,limit:this.limit,delay:this.delay,Time:this.Time,bit:this.bit,_delay:this._delay,note:this.note,serial:this.serial,channel:this.channel,size_const:this.size_const}
+	setInterval(function(obj) {
+	  if(!obj.delay){
+		  a = analogRead(obj.pin);
+		  if(!obj.bit)
+			if(a>obj.limit)
+			{
+				obj.max = 0;
+				while(a>obj.max)
+				{
+					obj.max=a;
+					a = analogRead(obj.pin);
+				}
+				Output1(obj.channel,obj.note,obj.max,obj.serial,obj.size_const);
+				obj.bit=true;
+			}
+		  	else;
+		  else if(obj.bit)
+			if(a===0.0)
+			{
+			  obj.delay = true;
+			  setTimeout(function ()    {obj.bit = false;obj.delay = false;}, obj._delay);
+			  Output2(obj.channel,obj.note,obj.serial);
+			}
+	  }
+	},this.interval,this.obj);	
+}
+
+exports.connect = function(pin, interval, delay, limit, serial, channel, note, size_const) {
+  return new Drum(pin, interval, delay, limit, serial, channel, note, size_const);
+};
+