I managed to make my DC motor respond to my potentiometer and adjusted the speed of rotation of the motor by adjusting the pot. I then assembled the mechanics for a simple vibrational movement by attaching the cork slice with the motor centered, and attached a straightened paperclip off center to the cork slice. The motor was then attached to the end of a pen casing with the paper clip running through the pen casing to create a point. This provided a nice vibrational motion with the up and down movement necessary for the tattoo pen to work. Of course due to the obvious sanitary risks, I did not use the actual paperclip point to tattoo anything, but potentially it could be replaced with a sanitary needle for it to work.

Components:

DC Motor

Diode

Transistor

10K resistor

Battery pack

Paper clip

Pen

Arduino Code:

/* * one pot fades one motor * modified version of AnalogInput * by DojoDave <http://www.0j0.org> * http://www.arduino.cc/en/Tutorial/AnalogInput  * Modified again by dave */int potPin = 0;   // select the input pin for the potentiometerint motorPin = 9; // select the pin for the Motorint val = 0;      // variable to store the value coming from the sensorvoid setup() {  Serial.begin(9600);}void loop() {  val = analogRead(potPin);    // read the value from the sensor, between 0 - 1024  Serial.println(val);  analogWrite(motorPin, val/4); // analogWrite can be between 0-255}