Summary of Pee to Check-In to Foursquare – Mark Your Territory using Arduino
This article introduces "Mark Your Territory," an open-source system that enables physical check-ins on Foursquare using Android ADK and Arduino. The project bridges the digital and physical worlds by requiring users to leave a physical mark, such as urine, to trigger a digital status update. It serves as an educational tool for Android and Arduino programming, sensor integration, and laser cutting, while encouraging a return to tangible environmental interaction through specific constraints like gradients and ephemeral marks.
Parts used in the Mark Your Territory:
- Android Phone with MYT app
- Arduino board supporting the ADK
- Arduino firmware for moisture sensing
- Nails
- Wire
- Solder
- Silicone
- Cornstarch
- Absorbent sturdy paper
- Spraypaint
- Laser cutter (or screen printing and cutting method)
- Cabbage
- Silver Goauche
- Box
- Velcro
- 9 volt battery
- Clothes pin
- Person specific plant seeds
- Dirt
- Heat press (or heavy flat things)
In case you are unfamiliar with the most amazing new way to physically “check in” to foursquare here is a video that will explain it all:
Mark Your Territory is a fully open-source system but because it interacts with the physical world as well as the digital one, some construction is necessary beyond just simply downloading the app to your phone.

The main project site is here: http://www.markyourterritory.org/
This project uses the brand new Android ADK (Accessory Development Kit) platform for combining Arduino input with an Android device. Thus the included source code is good to experiment with and provides a basic starting point for anyone getting into
-Android programming
-Arduino programming
-Using Google’s new Accessory Development Kit
-Basic Sensing
-Using the foursquare API
-Printing colored designs with a laser cutter
(though my code is pretty messy)
If you are interested in the code aspect of this project check out the step labeled “Hacking the Code”
*NOTE: Remember that Physical Check-ins may not be recognized by many establishments. If you want to claim an area, stake something in the ground, or pee on property you don’t own, you are taking your own legal risks. I’m not responsible for any kind of mess you may get yourself into.
Step 1: Materials Needed
In order to fully use the system you will need the following items:
1) Android Phone
with the MYT app: https://market.android.com/details?id=com.andrewquitmeyer.MarkYourTerritory
2) Arduino board supporting the ADK (Android Development Kit)
compatible boards listed here: http://developer.android.com/guide/topics/usb/adk.html
(I use this one http://www.arduino.cc/en/Main/ArduinoBoardADK )
3) Arduino firmware for moisture sensing
Available here:http://dwig.lcc.gatech.edu/projects/Quitmeyer/myt/store/Arduino_ADK_SimpleMoistureReader.zip
4) building/electronic/art materials
nails
wire
Solder
Silicone (not entirely necessary)
Cornstarch (not entirely necessary)
absorbent sturdy paper
spraypaint + laser cutter (or your own method of screen printing and cutting)
cabbage
Silver Goauche
box
velcro
9 volt
clothes pin
Person specific plant seeds
dirt
heat press (or a bunch of heavy flat things)
Step 2: Theory
While many may consider this project rather ridiculous, the project is based upon an underlying design theory of embedding physical/natural systems into digital works.
In this world there are organisms and areas. Over billions of years complex, powerful systems evolved which enable the organisms to stake a claim upon a physical area in many different ways. All of these varying methods featured specific affordances and constraints which lead to powerful proliferation of information through the totality of an environment. A dog urinating on a tree, for instance, leaves not only the information that a specific animal had been to a place, but also data concerning the creatures physiology, stature, frequency of visits, and mood.
As humans developed language, we began to leave this rich system designed by our animal brethren and our other senses dulled. With advances in intra-human communication such as printing or rapid electronic communication came further separation from the rest of the physical world.
One of the latest manifestations of this digitally mediated human solipsism is Foursquare. In Foursquare, similacra of real-world locations are digitally overlain in which humans can easily communicate to each other if they (supposedly) visisted a particular place, and which person (supposedly) holds domination over this place by visisting it the most frequently.
Mark Your Territory is a new system that lets individuals check-in to foursquare by physically urinating at the actual location.
MYT maintains the abilities of Foursquare while drawing humans back into the physical world. It is not a shunning of digital technology, but instead serves as a patch, tying together the tear between the worlds of the physical and (Humans-only) digital.
By imposiving several carefully crafted constrains upon one’s digital check-in, the new physical-check-in is imbued with several features drawn from real-world marking. Such features include:
Check-In Gradient
-How “there” were you?
Unbiased Profiles
-A description of yourself that you cannot cheat
Cross-Species Communication
-Squirrels knows nothing of your Foursquare status but can tell where you peed
True Ephemera
-Maintenance of a physical reputation is demanding (and rewarding)
Indirect Environmental Restructuring
-Explicit marks fade, but one’s impact on a physical environment is permanent.

NOTE: Some of my oppenents maydeclare this project as “sexist design” and that females can’t/won’t use this system.
Females can also use the device in a squatting manner, with the aid of a peripheral such as the go-girl (www.go-girl.com), or by studying the standing techniques discussed in “A Woman’s Guide on How to Pee Standing Up” .
For more detail: Pee to Check-In to Foursquare – Mark Your Territory using Arduino
- How does the Mark Your Territory system work?
The system uses an Android phone connected to an Arduino board via the Accessory Development Kit to detect physical moisture, allowing users to check into Foursquare by physically urinating at a location. - Can females use this device?
Yes, females can use the device by squatting, using a peripheral like the go-girl, or by studying standing techniques discussed in the guide. - What is the primary goal of this project?
The goal is to embed physical natural systems into digital works, drawing humans back into the physical world while maintaining Foursquare's abilities. - Does this project involve learning new programming skills?
Yes, it provides a starting point for experimenting with Android programming, Arduino programming, Google's Accessory Development Kit, basic sensing, and the foursquare API. - Are there legal risks associated with this project?
Yes, users take their own legal risks if they stake claims, claim areas, or urinate on property they do not own, as establishments may not recognize these physical check-ins. - What materials are needed to build the hardware component?
Building requires nails, wire, solder, silicone, cornstarch, absorbent paper, spraypaint, a laser cutter, cabbage, silver Goauche, a box, velcro, a 9 volt battery, a clothes pin, seeds, dirt, and a heat press. - What is the significance of the Check-In Gradient feature?
The Check-In Gradient determines how present the user was at the location based on the physical act performed. - Why is the code described as messy?
The author notes the code is messy but provides it as a basic starting point for anyone interested in hacking the code aspect of the project.
