Space state

Project: Space state
Featured:	No
State	Completed
Members	Vicarious, xopr, Coolepascal, Prodigity
GitHub	No GitHub project defined. Add your project here.
Description	Show the current state (open or closed) of our space
Picture

current implementation

The current iteration of the spacestate switch works with Spacestate sensors over MQTT (using Tasmota) to polulate the SpaceAPI and uses the template: {"NAME":"ACKsensor","GPIO":[0,0,0,0,0,0,0,0,1,0,0,0,1,1],"FLAG":0,"BASE":18}.

Note that there are also (somewhat cheesy) renders of the switch: sketchup model and a derived GIMP mini version.

The space state is connected to fuse group A.

previous versions

ESP-01 version (2015-2021)

This sketch was a web client and will update the SpaceState

It reads the GPIO2 (pulled up) pin where the space state switch is connected to via ground. GPIO0 is reserved for onewire devices.

hardware

The new Raspberry PI replacement: fast boot times and no SD card corruption anymore, thanks to the ESP8266 The hardware is simple enough to put on a small prototyping board. It has a 3v3 regulator and the 4k7 and 10k pull-ups for onewire and the spacestate switch respectively.

code

ESP8266-SpaceState.ino

Click here to view the source code

/*
  2015-07-05: Created by xopr
  
  Code based on http://iot-playground.com/2-uncategorised/41-esp8266-ds18b20-temperature-sensor-arduino-ide by Igor Jarc
 
  External libraries:
  - https://github.com/milesburton/Arduino-Temperature-Control-Library
 
  This program is free software; you can redistribute it and/or
  modify it under the terms of the GNU General Public License
  version 2 as published by the Free Software Foundation.
*/

#include <ESP8266WiFi.h>
#include <OneWire.h>
#include <DallasTemperature.h>

//AP definitions
#define AP_SSID     "ACKspaceWifi"
#define AP_PASSWORD "nospacenet"

#define API_SERVER  "ackspace.nl"
#define API_KEY     "<YOUR_KEY>"

#define PIN_SWITCH  2

void updateSpaceState( bool _bState );

void setup()
{
  Serial.begin(115200);

  pinMode( PIN_SWITCH, INPUT_PULLUP );
  
  wifiConnect( );

}


bool bState = false;
unsigned long Time = 0;

void loop()
{
  if ( ( millis() - Time > 19900 ) || bState != digitalRead( PIN_SWITCH ) )
  {
    delay( 100 );
    
    bState = digitalRead( PIN_SWITCH );

    updateSpaceState( bState );
    updateOldSpaceState( bState );
    Time = millis();
  }

  delay( 1 );
}

void updateSpaceState( bool _bState )
{
    // Use WiFiClient class to create TCP connections
  WiFiClient client;
  if (!client.connect( API_SERVER, 80 ) )
  {
    Serial.println( "connection failed" );
    return;
  }

  // We now create a URI for the request
  String url = "/spaceAPI/?update&state=";

  if ( _bState )
    url += 0;
  else
    url += 1;

  url += "&key=";
  url += API_KEY;

  Serial.print( "Requesting URL: " );
  Serial.println( url );

  // This will send the request to the server
  client.print( String("GET " ) + url + " HTTP/1.1\r\n" +
                "Host: " + API_SERVER + "\r\n" + 
                "Connection: close\r\n\r\n");
  delay( 10 );

  // Read all the lines of the reply from server and print them to Serial
  while( client.available( ) )
  {
    String line = client.readStringUntil( '\r' );
    Serial.print( line );
  }

  Serial.println( );
  Serial.println( "closing connection" );
}

void updateOldSpaceState( bool _bState )
{
    // Use WiFiClient class to create TCP connections
  WiFiClient client;
  if (!client.connect( API_SERVER, 80 ) )
  {
    Serial.println( "connection failed" );
    return;
  }

  // We now create a URI for the request
  String url = "/FORGOT_THE_URI";

  if ( _bState )
    url += "KEY_TO_SET_THE_SPACE_CLOSED";
  else
    url += "KEY_TO_SET_THE_SPACE_OPEN";

  Serial.print( "Requesting URL: " );
  Serial.println( url );

  // This will send the request to the server
  client.print( String("GET " ) + url + " HTTP/1.1\r\n" +
                "Host: " + API_SERVER + "\r\n" + 
                "Connection: close\r\n\r\n");
  delay( 10 );

  // Read all the lines of the reply from server and print them to Serial
  while( client.available( ) )
  {
    String line = client.readStringUntil( '\r' );
    Serial.print( line );
  }

  Serial.println( );
  Serial.println( "closing connection" );
}

void wifiConnect()
{
    Serial.print( "Connecting to " );
    Serial.print( AP_SSID );
    WiFi.begin( AP_SSID, AP_PASSWORD );
    while ( WiFi.status() != WL_CONNECTED )
    {
        delay( 1000 );
        Serial.print( "." );
    }
  
    Serial.println( "" );
    Serial.println( "WiFi connected" );

    // Print the IP address
    Serial.println( WiFi.localIP( ) );
}

Raspberry Pi version (2011-2015)

notes

• Prodigity 23:34, 18 November 2014 (CET) Python script now doesn't crash and burn on failed connections
• Prodigity 23:23, 18 November 2014 (CET) The raspberry pi now mounts root as READ ONLY with the help of this tutorial (http://blog.pi3g.com/2014/04/make-raspbian-system-read-only/)

  This has been done to prevent corruption of the SD card.

• Prodigity 02:34, 11 November 2014 (CET) Space state indicator now has a third state; "?"

A php script now periodically runs on the server to check when the spacestate has last been set;

if it is has been longer then 5 minutes it sets the state to "?".

This has been done to prevent power outages and loss of internet connection leaving an incorrect state.

hardware

Vicarious and Prodigity have revived the SpaceState switch; It now uses a raspberry pi.

The raspberry pi is currently running a python daemon which reads a GPIO pin every 10 seconds. This GPIO pin is connected to one end of the switch and a ground connection from the GPIO header is connected to another. When the switch is in the 'off' position the GPIO pin gets pulled up to +3.3v with the help of a 10K resistor, otherwise (when the switch is 'on') the GPIO pin gets pulled down.

The python script uses the RPi.GPIO, urllib2 and time library to accomplish its task. RPi.GPIO is used to easily read the GPIO pins from within python. urllib2 is used to post the spacestate to the website. Time is used to limit the amount of GPIO polls and more importantly, to limit the amount of network traffic.

code

spacestate.py

Click here to view the source code

#!/usr/bin/python
import time, urllib2
import RPi.GPIO as GPIO
GPIO.setmode(GPIO.BOARD)
GPIO.setup(18, GPIO.IN)

# Check space switch for ever and ever ....
while 1:
        input_value = GPIO.input(18)
        if input_value == 1: # Space closed
                try:
                        bla = urllib2.urlopen('..')
                except:
                        print "Couldn't connect.."
        else:                # Space open
                try:
                        bla = urllib2.urlopen('..')
                except:
                        print "Couldn't connect.."
        print input_value # for debugging purposes..
        time.sleep(10) # Poll every 10 seconds..

Mac version (2011)

hardware

We found a huge power switch which we mounted to the space wall this switch is connected with a cable to the Space-Mac using an serial to usb converter. On the Mac a perl scripts reads the space state. If the space-state changes, the perlscripts uses wget to call an php script on the ACKspace website. The php scripts sets an space-state variable in a file. The same script is used to read the space-state variable and show the status on the webpage.

software

This is the perl script that does the thing on te Mac (note that this code is not yet the actual running version)

spacestate.pl

Click here to view the source code

   #!/usr/bin/perl -wT
   # Title    : spacestate.pl
   # Function : read spacestate switch en set action accordingly
   # Author   : Pascal Schiks (C) 2011

   #
   my $serialdev="/dev/tty.PL2303-000061FD";
   
   use strict;
   use IO::Handle;
   use Fcntl;

   my $TIOCMGET = 0x5415;

   my $spacestate=0;
   my $lastspacestate=$spacestate;
   while(1)
   {
      if(sysopen(SERIAL, $serialdev, O_RDWR))
      {
         my $mdmctl="";
         my $ioresult;
         unless(($ioresult=ioctl(SERIAL,  $TIOCMGET, $mdmctl))==-1)
         {
            $mdmctl = unpack('i',$mdmctl);
            $spacestate = ($mdmctl&64)==0 ? "open":"close";
            print "$spacestate\n" if($spacestate ne $lastspacestate);
         }
         else
         {
            print "Weet ik veel Error\n";
         }
         close(SERIAL);
         $lastspacestate = $spacestate;
      }
      else
      {
         print "Error, Could not open $serialdev\n";
      }
      sleep(1);
   }

Skype version (2010)

This version used the ACK.space skype status to indicate whether we were open.

pics or it didn't happen

• 

  Spacestate switch

• 

  Spacestate closed

• 

  Spacestate open

Location: hACKspace (between the two doors)