This document discusses connecting an alcohol sensor to a Raspberry Pi and using Node.js to integrate the sensor readings with a Drupal website. It describes how to set up the hardware with an Arduino, alcohol sensor and Raspberry Pi. It then explains using Node.js on the Raspberry Pi to read data from the I2C bus and send it to a Drupal site using Drupal integration modules. It provides details on configuring and running the Node.js server and custom extension module to interface with Drupal.