Citizen Sensor is an open source project. I am trying my best to maintain an updated repository of my work in terms of hardware, software, and processes. If you are checking out the project and can’t find something, please feel free to email me and I will share as much as I possibly can!!


Citizen Sensor MQ-7 Carbon Monoxide Breakout Kit

  • Currently Available Kit – Email Joe to purchase! $15 + shipping.
  • Development and Sensor Info
  • Build instructions: download in PDF or on instructables.
  • MQ-7 Carbon Monoxide Sensor by Hanwei Datasheet
  • Arduino Library and Example Code (released 10/2010, JMSaavedra)
  • Eagle CAD Board and Schematic

Eagle Files (.sch and .brd) :

BoarduinoBluetooth v01 – based on Adafruit’s Boarduino design: download
MQ-7 voltage toggle breakout : download


Nokia N900 Application drafts at GitHub
Android Application on SVN (hosted by New Youth City Learning Network)
Django PostgreSQL database application up soon!


BlueSMiRF – Bluetooth breakout
Barebones PCB prototyping
Excellent Tupperware enclosure (SKU: 10042184) for Adafruit’s GPS logger shield

Processes Developed for this Project

Custom PCB Prototyping Using a Laser Cutter
Perfboard Hackduino (Arduino-compatible Circuit)

Laser Cutter DIY PCB Process files

modular//neuroid Bluetooth AI Vector file: download
miniUSB ’sensor hub’ breakout board AI Vector file: download