phpoc_man
Published © GPL3+

Real-Time Monitoring Toilet Paper via Web Interface

This project helps caretakers save time spent manually checking toilet paper, especially in a large buildings.

BeginnerProtip2 days4,178
Real-Time Monitoring Toilet Paper via Web Interface

Things used in this project

Story

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Schematics

Wiring

Code

Main task (task0.php)

PHP
This code is run in infinite loop to read distance from sensor and send it to web procgam on web browser via websocket
<?php

if(_SERVER("REQUEST_METHOD"))
	exit; // avoid php execution via http request

include "/lib/sd_340.php";
include "/lib/sn_tcp_ws.php";

// setup trigger pulse timer
ht_ioctl(1, "set mode output pulse");
ht_ioctl(1, "set div us");
ht_ioctl(1, "set repc 1");
ht_ioctl(1, "set count 5 10"); // 10us pulse width
 
// setup echo capture timer
ht_ioctl(0, "reset");
ht_ioctl(0, "set div us");
ht_ioctl(0, "set mode capture toggle");
ht_ioctl(0, "set trigger from pin rise");
ht_ioctl(0, "set repc 4");

ws_setup(0, "ToiletPaperMonitoring", "text.phpoc");

$pre_dist = 0;
$count = 0;

while(1)
{
	if(ws_state(0) == TCP_CONNECTED)
	{
		ht_ioctl(0, "start"); // we should start capture timer first
		ht_ioctl(1, "start"); // start trigger pulse
		 
		usleep(10000); // sleep 10ms
		 
		// 1st capture value ("get count 0") is always zero.
		// we should get 2nd capture value;
		$us = ht_ioctl(0, "get count 1");
		
		if($us == 0)
			continue;
		
		$dist = $us * 340.0 / 2; // us to meter conversion
		$dist = $dist / 10000; // meter to centimeter conversion
		
		//filter noise
		if((int)$pre_dist !=0)
		{
			if(abs($dist - $pre_dist) <= 1)
				$count++;
			else
				$count = 0;
		}
			
		$pre_dist = $dist;
		
		if($count > 5)
		{
			ws_write(0, "$dist");
			echo "$dist\r\n";
			$count = 0;
		}
		//echo $dist, "\r\n";
		//usleep(10000);
	}
	else
	{
		$pre_dist = 0;
		$count = 0;
	}
}
?>

User Interface (index.php)

PHP
This is client program to provide user interface and visualize data
<html>
<head>
<title>PHPoC / <?echo system("uname -i")?></title>
<meta name="viewport" content="width=device-width, initial-scale=0.5">
<style>
body {text-align: center;}
canvas { 
	margin-right: auto;
	margin-left: auto;
	width: 500px; 
	height: 500px; 
	background:url(background.png) no-repeat;
	background-size: contain;
}
</style>
<script>
var REAL_DISTANCE_MAX = 11.611; // in centimeters. This parameter is got from measurement with no paper-roll
var REAL_DISTANCE_MIN = 0.5; // in centimeters. This parameter is got from measurement with a full paper-roll.

var CANVAS_RADIUS_MAX = 225; // in pixel. This parameter depends on the canvas size and background image 
var CANVAS_RADIUS_MIN = 56; // in pixel. This parameter depends on the canvas size and background image 

var canvas;
var ctx; 
var trash, bin;
var ws = null;

function init()
{
	canvas = document.getElementById("cvs");
	ctx = canvas.getContext('2d');
	ctx.strokeStyle = "LightGray";
	ctx.fillStyle = "white";
	ctx.lineWidth = 5;
	
}
function ws_onopen()
{
	document.getElementById("ws_state").innerHTML = "OPEN";
	document.getElementById("wc_conn").innerHTML = "Disconnect";
}
function ws_onclose()
{
	document.getElementById("ws_state").innerHTML = "CLOSED";
	document.getElementById("wc_conn").innerHTML = "Connect";

	ws.onopen = null;
	ws.onclose = null;
	ws.onmessage = null;
	ws = null;
}
function wc_onclick()
{
	if(ws == null)
	{
		ws = new WebSocket("ws://<?echo _SERVER("HTTP_HOST")?>/ToiletPaperMonitoring", "text.phpoc");
		document.getElementById("ws_state").innerHTML = "CONNECTING";

		ws.onopen = ws_onopen;
		ws.onclose = ws_onclose;
		ws.onmessage = ws_onmessage;
	}
	else
		ws.close();
}
function ws_onmessage(e_msg)
{
	e_msg = e_msg || window.event; // MessageEvent

	var dist = e_msg.data; // in centimeters
	console.log(dist);
	
	if(dist < REAL_DISTANCE_MIN)
		dist = REAL_DISTANCE_MIN;
	
	if(dist > REAL_DISTANCE_MAX)
		dist = REAL_DISTANCE_MAX;
	
	if(dist > (REAL_DISTANCE_MAX - 0.2))
		ctx.strokeStyle = "Red"; // alert
	else
		ctx.strokeStyle = "LightGray";
	
	// Scale
	
	var real_thickness = REAL_DISTANCE_MAX - dist;
	var ratio = real_thickness / (REAL_DISTANCE_MAX - REAL_DISTANCE_MIN);
	var cvs_thickness = ratio * (CANVAS_RADIUS_MAX - CANVAS_RADIUS_MIN);
	var radius = Math.round(cvs_thickness + CANVAS_RADIUS_MIN);
	
	ctx.clearRect(0, 0, canvas.width, canvas.height);
	
	ctx.beginPath();
	ctx.arc(canvas.width / 2, canvas.height / 2 , radius, 0, 2*Math.PI);
	ctx.stroke();
	ctx.fill();
	
	// draw axle
	ctx.save();
	ctx.fillStyle = "DimGray";
	ctx.beginPath();
	ctx.arc(canvas.width / 2, canvas.height / 2 , CANVAS_RADIUS_MIN, 2*Math.PI, 0);
	ctx.fill();
	ctx.restore();
}

window.onload = init;
</script>
</head>
<body>

<h2>
Toilet-Paper Monotoring<br><br>
</h2>
<canvas id="cvs" width="500" height="500"></canvas>
<p><span id="ws_state">CLOSED</span><br></p>
<button id="wc_conn" type="button" onclick="wc_onclick();">Connect</button>
<button id="wc_clear" type="button" onclick="wc_clear();">Clear</button>
</body>
</html>

Credits

phpoc_man

phpoc_man

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