Wednesday, December 30, 2015

Fiat Panda windscreen wiper timer

My Panda, after almost 16 years of service, begins to show its years.
This time, the front  wiper does not work properly.
You may read almost evreywhere, Google is your friend....
About this matter, it seems nobody ever went deeper, and to my issue, which seems to be quite widespread, Google wouldn't helped that much; the only answer I found by it is "change the motor and its controlling circuit". This solution can be quite expansive, looking around for prices,  it seems you can not find it for less than 100€.
On the other hand, looking at the controlling circuit, it does not seem to be very complicated, so I decided to use some time to resolve my issue, and therefore save 100€.

As from the image I included in this post, circuit itself is not too complicated.
I also made some schemas to help myself in understanding its behaviour.

The switch appearing in the bottom of the schema, is embedded in the gear inside the transmission of the motor. Its rotation make the controller understand about the wiper position. It is a plastic gear with the core made of conductor material. It appears as follow:
Where the RED part is the metallic core, and the black lines is where contact from the control circuit goes.

Well, I guess this is the time where I tell you which is my problem, after all.
Problem is as follow:  the "SLOW" speed of the wipers does not work, and when it is set to the "FAST" speed, if you turn off the wiper it stops where it is, without return to its home postion.
After several hours of analysis, I found where the problem lies.
It is due to the oxidation of the normally open contact of the relay.

This way I saved myself more than 100€ for the spare part, I hope anyone else could found my info useful and save his money.

Friday, December 11, 2015

Block aggressive advertising calls

In my country, but I bet anywhere else do the same, the telephone calls for proposing new products are constantly increasing, these annoying calls, sometimes malicious, aren't always welcome.

My country has adopted a kind of institutional way to handle this phenomena, it is called  "registro pubblico delle opposizioni", using this, any citizen may publish his telephone number, merely this action should him guarantee he would never ever receive again any advertisement call.

Unfortunately, reality can't be more distant from what really is going to happen.

Telephone spammers do not use to follow rules, and the weak statement "this user does not want to be called for commercial purposes "  is not enough to prevent they to call you. 

If you do not want to be called, you have to find yourself a way to do that.
In other words, you have to find a way to recognize them as spammer, and forward them, for example, to an announce stating you do not want to be called.

As an Asterisk user I have a framework at my disposal, which potentially lets me route calls using any sort of policy; but the main issue is how to identify a spammer?

Internet community, seems to have faced this problem and has built a kind of database in which people complaints about telephone numbers.

It exists, for example, a service called TELLOWS on which anyone can leave a comment on a source telephone number.

So why don't use those information to identify spammers and avoid unwanted telephone calls?

My proposal is integrate the service provided by TELLOWS in the Asterisk dialplan.

Here an example of my thougths.

in the Asterisk dialplan
exten =>  incoming,       1,              Noop(Incoming call is just arrived)
exten =>  incoming,       n,              Set(tellowsc=${SHELL( ${CALLERID(num)})})
exten =>  incoming,       n,              GotoIf($[${tellowsc}>1]?reject)
exten =>  incoming,       n,              Dial(${destination},30,${FLAGS})
exten =>  incoming,       n,              HangUP()
exten =>  incoming,       n(reject),      Answer()
exten =>  incoming,       n,              Wait(2)
exten =>  incoming,       n,              Set(CDR(userfield)=RejectedByPolicy)
exten =>  incoming,       n,              Playback(spam)
exten =>  incoming,       n,              HangUP()
the bash script for the italian version of TELLOWS
score=$(wget -O - -q "$1" | grep "/images/score/score[0-9].png" | grep scoreimage | sed -r 's/.*score([0-9])\.png.*/\1/');
comments=$(wget -O - -q "$1" | grep "itemprop" | grep "Numero di commenti:"| sed -r 's/.*>([0-9]+)<.*/\1/');
echo -n "$comments";
I used, to reject calls, the number of comments the number has, but there's also a kind of number score, you can use to take your decision