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Turn your Arduino into a Drum-Kit

Drum Kit - Kit

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The Drum Kit Kit: comes with four piezo sensors, PCB and other parts needed to make it work with the Arduino as a mini shield.


Other material needed:

  1. 1.Wire to connect piezos (speaker style wire is OK)

  2. 2.Foam

  3. 3.Mouse pad

  4. 4.Auto body thin metal sheet

  5. 5.Spray glue & epoxy (or hot glue)

  6. 6.Solder

  7. 7.Tape or heat shrink tubing


Tools required:

Soldering Iron, Wire cutters, Scissors, Tin snips, Sand paper

Step 1:

Draw circles the on the metal sheet.


You choose the size.

Step 2:

Cut out the circles that you drew on the metal sheet with the tin sips.


WEAR SAFTY GLASSES and gloves !

Step 3:

Repeat for all of the drum pads.


Careful some of the edges may be sharp.

Step 4:

Ruff-up the center of each disk on one side. This is were you will glue the piezo.

Step 5:

Mix equal parts of epoxy on a scrap. Mix well, and don’t get dirt into the glue, because you will want the piezo to be glued down perfectly flat.


(Hot glue also works, but it is harder to get flat.)

Step 6:

Apply a thin amount of glue to the ruff area on the metal.

Step 7:

Press the piezo into the glue with the wires and light colored side up.


Put these aside until the glue is hard.

Step 8:

Make lengths of wire to connect the Drum kit to the piezos.


It is best to use two colors, because it is important that the red and black wire of the piezo go to the correct places on the drum kit.

Step 9:

To make soldering the wires to the piezos easier, tin the wires. To tin the wires, hold your soldering iron on the wire for a moment then melt solder onto the end of the wire so that it is shinny and silvery.


Do the same for the red and black wires connected to the piezos.

Step 10:

Holder one wire at a time place the tinned end next to the tinned end of the wire from the piezo and heat them with the soldering iron. The solder should easily melt and stick the wires together.


Hold still until the solder is sold, for a good connection.

Step 11:

The joint between the wire and the piezo is quite weak. To strengthen it I recommend using heat shrink tubing. You may also use, electrical tape or hot glue.

Step 12:

Using the same diameter circle that you used in Step 1 draw circles onto the bottom foam and the mouse pad.


Using a pair of scissors, cut out the circles that you just drew.

Step 13:

Using spray glue, coat one side of the base foam. Then place it glue side down onto the surface were you would like to build your drum pad. Press.

Step 14:

Decide how you would like to route your wire, before you complete this step. It will be harder to move the wires after.


Using the same technique as Step 13, apply glue to the bottom of the metal plate (side with the piezo) and glue it on top of the foam.

Step 15:

Now glue the mouse pads on top of the metal plates.

Intro:


The Drum Kit - Kit lets you turn your Arduino into a drum kit. Imagine the fun you could have building a drum kit and then “rocking the house”.


The kit contains the electronic parts required to make a drum kit. This includes the circuit board, resistors, diodes and pins. You supply the Arduino and the material to make the actual drum pads. Below you will find the easy instruction on how to make traditional looking drum pads, but you could also stick the piezos (the part the sense the hits on the drum) to many different surfaces. Imagine, playing your desk, lamp and telephone !

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How to build the circuit:

Step 1:

Get the Drum Kit - Kit and your soldering iron and solder.

Step 2:

Remove the paper from the resistors and the diodes.


Bend all of the resistors and diodes like this.


Only use your fingers to bend the leads against the part’s body. If you use a tool or a table top you may crack the part.

Step 3:

Push all of the resistors and diodes into the PCB, in the spaces marked R1 to R6 and D1 to D6. All of the resistors and all of the diodes are the same.


NOTE: The black band on the diode must be oriented to the side with the white band on the PCB printing (down when the text is readable, see left).


Resistors may go either way.

Step 3:

Flip the board over and heat up your soldering iron. You may want to tape the parts onto the board, so they don’t fall out when you flip it.


I prefer to tape the leads rather then bending them. When you bend them you could cause a short circuit, if you aren’t careful.


Solder all the leads.

Step 4:

Using wire snips, trim all of the leads so that they don’t stick out too much.


WEAR SAFTY GLASSES

Step 5:

Push the male pins through the PCB from the bottom and hold them there with some tape.


Solder them in place from the top.

Finished:

Your mini Arduino Drum Kit shield is now ready.


To connect your drum pads to the Drum Kit PCB see step 16 in the making pads section below.

Step 16:

At the bottom edge of the Drum Kit PCB, there is space to connect six drum pads. Each pad should go to one of the sets of pads with the wire that is connected to the red lead of the piezo to the + solder pad and the black wire from the piezo to the other.


NOTE: Connect only wire from red wire of piezo to a + solder pad.


To connect the drum pads to the Drum Kit, you have some choices.

  1. 1.Wire the pads directly, and solder the wires to the Drum Kit PCB for a permanent connection. [Easiest and most solid, but hard to change set-up.]

  2. 2.Use a combination of male and female headers soldered both to the end of your wires and the Drum Kit PCB (as in the photo to the left) so that you can disconnect the pads and move them about. [Convenient but may shake of if it is in a location that receives vibrations from the drum pads.]

  3. 3.Solder to RCA jacks and use other RCA jacks at the drum pad end, with an RCA cable.

How to build drum pads:


Building a drum pad in essentially just putting together a sandwich of layers with a sensor in the middle of it.


The top layers protect the sensor from damage and reduce the amount of noise from the drum stick hitting the sensor.


The middle layer is a piece of metal that helps transmit the shock from the stick into the piezo sensor.


The bottom layers help keep the drum pad from rattling on the table and also give it a solid base to mount it to something.


The drum pads show here were all assembled onto one piece of 1/4” plywood and the pads were made small so that it could be used as a desktop model. You may build yours much bigger, with individual pads. You could even get extra piezos and experiment with different constructions.

Using the Drum Kit - Kit with an Arduino:


Step 1.

Download, install and test the Serial MIDI Converter software with your Arduino. (Testing it here will help so you will know that the MIDI interface is working.)


NOTE: Only for people wanting to use a hardware MIDI interface. If you have a hardware based MIDI shield, you could also use it with the Drum Kit - Kit. Follow the directions that it came with, most often, you will simply use the TX serial pin of the Arduino and connect it to point were the shield gets the serial data to send out over the MIDI cable, you may also have to change the baud rate in the sketch.


Step 2.

Connect the Drum Kit to your Arduino. The solder pad where the drum pads wires connect will hang off the bottom edge of the Arduino and the six pins on the Drum Kit will fit into the six analog pin holes on the Arduino, with the two other pins fitting into the two ground pin holes.


Step 3.

Download the Drum Kit - Kit Arduino sketch.


Download: DrumKitV1b


Step 4.

Compile and upload the sketch to your Arduino.


Step 5.

Start the Serial MIDI Converter software, choose the serial port that your Arduino is using and the virtual MIDI ports that you set up in Step 1.


Step 6.

Start you music software and hit some drums !

Tuning the your Drum Kit:


The most common change the you will probably do to your Arduino Drum Kit sketch is change the musical note associated with a each pad, you may want a particular pad to be a snare drum and another to be a cymbal etc..., you decide.


The other type of tuning has to do with getting the best playing performance out of your configuration of drum pads. Since, you will be making your own drum pads, some people will use harder foam then others, some people will place their pads closer together then others and in other cases the type of length of wired used to connect the pads will affect the way the drum kits plays.

Area in the Drum Kit sketch where the user can tune the drum kit for their set-up.

Here is an explanation of the different areas where you can tune your drum kit.


PadNote: These are the MIDI notes that will be played when a drum pad is triggered. They range from 0 to 127, where middle C is the number 60. Do not use a value above 127.


PadCutOff: The Arduino reads analog values as a number from 0 to 1023. When you hit a drum pad the piezo creates a voltage spike and ripple. We are reading the value of this voltage spike. The padCutOff is the minimum value of this spike that we will accept as a drum hit. You can set it higher or lower. Lower will make more false triggers, but easier to make drum hits if your pads are thick. Higher will require you to hit the pads harder to make them sound, but you will get less false triggers from hitting a nearby pad if they are on the same surface.


MaxPlayTime: Is a delay based on the number of times the main loop of the program runs through. This delay is intended to keep the kit from sounding multiple hits for one drum hit, since the Arduino is fast enough to read the same voltage spike a few times. If you are getting two hits etc, when you hit the drum only once, increase this number if there is too large a delay when you play a drum roll, then decrease this number.


midichannel: Is simply the MIDI channel that will be send in the MIDI message.


VelocityFlag: Is a true or false setting to use velocity or not. Velocity is the value of how hard you hit the drum pad. A higher velocity would produce a louder drum sound.

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