Cold Snap

config.txt

dtoverlay=w1-gpio

connect.sh

ssh user@ngrokAddress.com -p12345

data.js

const { join } = require('path');
const { readFileSync, readdirSync, statSync } = require('fs');

const pathPrefix = '/sys/bus/w1/devices';

function getSensors() {
  try {
    const results = readdirSync(pathPrefix)
      .filter(file => statSync(join(pathPrefix, file)).isDirectory())
      .filter(directory => directory !== 'w1_bus_master');

    return results;
  } catch (e) {
    console.error(`Cannot Get Sensor: ${e}`);
    return [];
  }
}

function readData(sensor) {
  try {
    const results = readFileSync(`${pathPrefix}/${sensor}/w1_slave`, 'utf-8');
    return results;
  } catch (e) {
    console.error(`Cannot Read Sensor: ${e}`);
    return null;
  }
}

function parseData(data) {
  if (data) {
    const [, secondLine] = data.split('\n');
    const values = secondLine.split(' ');
    const celsiusTemp = values[9].slice(2) / 1000;

    return {
      celsius: celsiusTemp || null,
      fahrenheit: celsiusTemp ? parseInt((celsiusTemp * 1.8) + 32, 10) : null,
    };
  }

  return null;
}

function getTemperature(sensor) {
  const data = readData(sensor);
  return parseData(data);
}

ngrok.yml

authtoken: <add_your_token_here>
tunnels:
  ssh:
    proto: tcp
    addr: 22

screen.sh

# To start
screen node . 50 1000 5000

# To detach
# cmd+a, cmd+d

# To reattach
screen -r

twilio-function.js

exports.handler = function(context, event, callback) {
  context.getTwilioClient().messages.create({
    to: process.env.RECIPIENT_PHONE_NUMBER,
    from: process.env.SENDER_PHONE_NUMBER, // Twilio phone number
    body: `Cold snap! The current temperature is ${event.temp || ''}deg F, which is at or below your threshold of ${event.threshold || ''}deg F`
  }).then(msg => {
    callback(null, msg.sid);
  }).catch(err => callback(err));
};

Shortcut for ssh'ing into the Pi
alias cs="ssh pi@x.x.x.x -p"

Use: cs {port}
Ex: cs 1234