Skip to main content

how everything is connected (for now)

There are currently three different parts:

  • A "requester" client that will request for a door opening.
  • A single "target" client (the Raspberry Pi) that will receive requests
  • A central server that will relay the messages between the "requester" clients and "target" client

The messaging is done using WebSocket--really great stuff.

"Requester" Client
Currently just a simple PHP/JavaScript page that can send a textual message to the central server.

"Target" Client
A Python script that keeps an active WebSocket connection to the central server. As said above, this is executed in the Raspberry Pi.

Central Server
A Python script that listens for WebSocket messages. This uses the Tornado library for Python for creating the WebSocket server. This is executed in the Ubuntu web server.

I'll try to put more details as I go, but for now, I think this 10000-feet view is the better for catching up with the status logging.
Labels:

Comments

Post a Comment

Popular posts from this blog

dabbling with cylon

I'm playing around with Cylon JS whenever I have the time. in order to use the leap motion for control, the hand control will need to communicate with the pc that is connected to the leap motion device (leap motion does not provide an arm/linux driver). it seems that Cylon devices can communicate with each other through socket.io or http, and I am currently playing around with that.
Post a Comment
Read more

interfacing alcohol sensor with the led

Programmed the Arduino to have the alcohol sensor play with the LED display. I had the display show either "open" or "lock" depending on the alcohol sensor level. Here is the result: Notice that this has a very notable flaw with respect to its potential use as a "breathalyzer lock": it stays "open" as long as there is alcohol present, which only then "lock"s. This means that currently, if you leave it alone (no breathing into it), it will keep the device unlocked. This is something I will have to resolve. code used for this: int del = 5000; int gasPin = 0; int value = 0; int lastValue = 0; void setup(){ //  Serial.begin(9600);   pinMode(12, OUTPUT);   pinMode(11, OUTPUT);   pinMode(10, OUTPUT);   pinMode(9, OUTPUT);   pinMode(8, OUTPUT);   pinMode(7, OUTPUT);   pinMode(6, OUTPUT);   pinMode(5, OUTPUT);   pinMode(4, OUTPUT);   pinMode(3, OUTPUT);   pinMode(2, OUTPUT);   pinMode(1, OUTPUT);...
Post a Comment
Read more

alcohol sensor (and some patience)

Soldered the alcohol sensor into something that is connectable: I tried to connect this to the Arduino, as I had the appropriate circuitry, but I did not get any legitimate output from it. 5V going in, 5V coming out with no variations. Nothing seems to be awry in wiring, as the circuit seems to be grounded properly (and the 5V current is flowing).  There are a couple of potential factors as to why I'm not seeing any results: - I'm using a 10k ohm resistor, while some guides (and the datasheet for the sensor) asks for 100-200k. However, there seems to be a good amount of people using 10k and getting at least some kind of result. A batch of 100k ohm resistors I ordered is on its way, so I guess I can try with them when they come. - This site  claims that these sensors take 24-48 hours for its signals to be stable. It also tells me that I should not be powering the sensor directly from the Arduino, which I have been doing, out of concern that the power draw of ...
Post a Comment
Read more