Aim:

To tweet a message on twitter if a switch is turned on of (in our case the space is open/closed).

Bonus : switch on/of external device, in our case our public access point in our space.

Materials

Server where the software runs
- Com port on server

For the bonus part

Any access point on 12V (if different change relais)
Eletronics parts
- Serial D9 female
- R1 = 1K resistor
- T1 = BC547 Transistor
- K1 = Relais 12V (depending on external device)
- D1 = Diode 4101

Software

python
- oauth2
- python-twitter
- codes for the twitter API
- Script to tweet
GetSerialSignal command line

Steps

Build the hardware, for testing you can connect a switch on the comport pin 9 to 4 (closed) or 9 to 3 (open) like this:

Photo of simple version

Schematic & photo of build of bonus part

Er zit een klein foutje in het schema, waar pin 3 van de COM-poort staat moet pin 5 zijn.

Sofware

get code and compile setSerial

create script monserial

Serial monitor script - monserial.

#!/bin/sh
getstatus()
{
    oldstatus=$status
    status=`/root/setserial /dev/ttyS0 RI`
}

statuschange()
{
    if [ "$status" = 0 ]
#    if test "$status" == "0"
    then
        echo opened
        python tweet.py "We are open"
        curl "http://pagetoupdatestatus"
     else
        echo closed
        python tweet.py "We are closed"
        curl "http://pagetoupdatestatus"
     fi
}

getstatus
statuschange
while :
do
    getstatus
    if [ "$status" != "$oldstatus" ]
    then
        statuschange
    fi
    sleep 2
done

Do the steps of twitter API to get the autorisation codes. (4 codes in total)

get the python packages oauth2 and python-twitter

build and install these

copy/create the script below

Twitter Script - tweet.py

import twitter
import sys
import datetime

twit = twitter.Api(consumer_key='key_from_twitter',
consumer_secret='from_twitter', access_token_key='from_aouth_script', access_token_secret='from_aouth_script')

now = datetime.datetime.now()
timestamp = now.strftime("%d-%m-%Y %H:%M")

text = sys.argv[1] +' '+ timestamp

status = twit.PostUpdate(text)

You can now start the monserial script that wil tweet if the switch is used.

Good luck with building.

This project has been build by

Millibit for the bash script

Bigred for compiling SetSerial and all the hardware

Zeno for the twitter python script

Tweetswitch

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