Monitoring Radon Levels with Arduino

• Arduino (Uno) program to interface Safety Siren Pro Series 3 Radon Gas Detector Model No: HS71512
• Periodically reads radon level from 7-segment indicators and publish to Xively service to display graphs.
• Note: Hs71512 requires hardware modification to connect to Arduino.
• Requires Xively (https://github.com/xively/xively_arduino) and HttpClient (https://github.com/amcewen/HttpClient/releases) Arduino libraries. Before using add your Xively API key (see line in code below):

    char xivelyKey[] = "put your key here";

Based on works of Chris Nafis (http://www.howmuchsnow.com) for Safety Siren Radon Gas Detector Model No: HS80002

Modified by Andriy Rokhmanov (http://rokhmanov.blogspot.com) for HS71512