Pressure Sensor Drawing Machine

For this project, I’m making a pressure sensor drawing machine which responds to the pressure the user imposes on the sensor by changing the degrees that the servo motor rotates and the delay time between each rotation.

Videos of how the drawing machine works:



The patterns that the drawing machine draws can vary depends on the types of pen or markers I use because the friction on the tip of the pen can affect how the servor motor moves on the paper page. The smoothness of the paper can also be a factor that I need to think about. Also, how far the pen is from the spinner of the servor motor(the radius or the “arm” of the drawing machine) also decides how big of a pattern that the machine can draw.


I’ve also made a Twin Drawing Machine(without the pressure sensor though) in which two servo motors are connected, so they can exert forces on each other as they roatate, and affect the ways lines are drawn.

Here is a video of how it works. (I just realized that in this video, the arm that attaches the two servos together fall off and I didn’t notice it when I was recording…)

And here is the final work done by it.

Twin Drawing Machine

Current problems:

  1. When the degree that the arm of the drawing machine rotates is too big, the pen will touch the wire on the servor motor and won’t be able to go any further. I tried to hold the wire in the air while the drawing machine is working, hoping that the pen won’t be trapped by the wire anymore, but the whole machine ends up losing balance and falls.
  2. The machine can only work on a flat horizontal surface right now, which limits its potential of being used in more complicated circumstances such as garments or human bodies. I wonder it there is any ways that I can have it work on a vertical wall.


Some future plans:

I’m planning to add a heartbeat/pulse sensor into the circuit, so the user’s body has more control over the drawing machine. I want the drawing machine to draw faster and have smaller delay time (more frenetic looking) when the users’ pulse is faster, and more calm and smooth when the pulse is slower.  The idea of integrating human pulse into the machine is to create a communication tool out of the drawing machine. Many times in life, our consciousness represses certain thoughts because it’s favorable to us, and we ends up deceiving ourselves. But when I uses the pulse or hearbeat, which our consciousness can hardly control and so never cheats us, as the input source to instruct how the drawing machine moves, my biological mechanisms can direct the expression of my truest feelings on paper through the drawing machine. So in a sense, this communicative drawing machine can be considered as the most honest communication tool as long as our body is not subjected to the tricks of mind. One disadvantages that might occur to the pulse sensor is that it requires some time for it detect an accurate input date. Also, the pulse of the user might not under any changes if the person is not experiencing any dramatic emotional changes. So I think I should keep the pressure sensor in this case so that variation in input can still be created when the pulse stays the same.


Leave a Reply

Fill in your details below or click an icon to log in: Logo

You are commenting using your account. Log Out /  Change )

Google+ photo

You are commenting using your Google+ account. Log Out /  Change )

Twitter picture

You are commenting using your Twitter account. Log Out /  Change )

Facebook photo

You are commenting using your Facebook account. Log Out /  Change )


Connecting to %s