Tweet
MP3 player may be useful in museum or exhibition to provide voice-based information to visitors on demand. This project shows how to control MP3 via webpage using Arduino Uno.
Demonstration
Things Used In This Project
- Arduino Uno
- USB cable for Arduino
- PHPoC Wifi Shield or PHPoC Shield
- Serial MP3 Player
- Speaker
- Jumper wires
Serial MP3 Player
Serial MP3 player have two interfaces:
- Jack to speaker
- Interface to micro-controller (in this project is Arduino)
When receiving a command from micro-controller (e.g PLAY, PAUSE, VOLUME UP...), MP3 player read .mp3 file from SD card and perform action based on the command.
Before using, it need to copy .mp3 files to SD card and mount it to MP3 Player.
Wiring Diagram
- Stack PHPoC shield on Arduino
- Connect pin GND, VCC TX and RX of MP3 Player to GND, 5V, pin 8 and pin 9 of Arduino, respectively.
Data Flow
Web browser ---> PHPoC Wifi Shield ---> Arduino
Web app on web browser will send commands and data based on touch or click event to PHPoC shield via WebSocket. When receiving the command, PHPoC shield passes it to Arduino. Arduino sends command to MP3 player according to the command received from PHPoC Shield.
Command Set
Where, XX is volume value.
Note that: PHPoC shield has a buit-in program to pass data from web browser to Arduino. Therefore, we don't need to care about it.
What We Need to Do
- Set Wifi information for PHPoC shield (SSID and password)
- Upload new UI to PHPoC shield
- Write Arduino code
Setting Wifi Information for PHPoC Shield
See this instruction: http://www.phpoc.com/support/manual/...rk_first_setup
Upload new Web UI to PHPoC Shield
Create PHPoC source code remote_mp3.php
PHP Code:
<!DOCTYPE html>
<html>
<head>
<title>PHPoC Shield - IoT MP3 Player</title>
<meta name="viewport" content="width=device-width, initial-scale=0.7, maximum-scale=0.7">
<style>
body { text-align: center; font-size: 15pt; }
h1 { font-weight: bold; font-size: 25pt; }
h2 { font-weight: bold; font-size: 15pt; }
button { font-weight: bold; font-size: 15pt; }
</style>
<script>
var canvas_width = 450, canvas_height = 250;
var trans_x = canvas_width/2, trans_y = canvas_height/2 - 30;
var plate_width = 300, plate_height = 80;
var volume_width = 300, volume_height = 8;
var circle_radius = 80;
var volume_y = circle_radius + 35;
var inner_radius;
var pause_width, pause_height;
var play_width, play_height;
var next_width, next_height, next_top, next_right;
var arrow_width;
var play_state = 0; // 0: pause. 1: playing
var volume = 20;
var click_state = 0; // 0: no click, 1: back button click, 2: next button click
var ws;
function init()
{
var canvas = document.getElementById("remote");
canvas.style.backgroundColor = "#999999";
canvas.width = canvas_width;
canvas.height = canvas_height;
canvas.addEventListener("touchstart", mouse_down);
canvas.addEventListener("touchend", mouse_up);
canvas.addEventListener("touchmove", mouse_move);
canvas.addEventListener("mousedown", mouse_down);
canvas.addEventListener("mouseup", mouse_up);
canvas.addEventListener("mousemove", mouse_move);
var ctx = canvas.getContext("2d");
ctx.translate(trans_x, trans_y);
inner_radius = circle_radius - 25;
next_height = Math.round(0.6 * plate_height);
arrow_width = Math.round(next_height * Math.cos(Math.PI/3.5));
next_width = 2*arrow_width - 7;
next_top = next_height / 2;
next_right = plate_width / 2 + 15;
update_view();
}
function connect_onclick()
{
if(ws == null)
{
var ws_host_addr = "<?echo _SERVER("HTTP_HOST")?>";
if((navigator.platform.indexOf("Win") != -1) && (ws_host_addr.charAt(0) == "["))
{
// network resource identifier to UNC path name conversion
ws_host_addr = ws_host_addr.replace(/[\[\]]/g, '');
ws_host_addr = ws_host_addr.replace(/:/g, "-");
ws_host_addr += ".ipv6-literal.net";
}
ws = new WebSocket("ws://" + ws_host_addr + "/remote_slide", "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_onopen()
{
document.getElementById("ws_state").innerHTML = "<font color='blue'>CONNECTED</font>";
document.getElementById("bt_connect").innerHTML = "Disconnect";
}
function ws_onclose()
{
document.getElementById("ws_state").innerHTML = "<font color='gray'>CLOSED</font>";
document.getElementById("bt_connect").innerHTML = "Connect";
ws.onopen = null;
ws.onclose = null;
ws.onmessage = null;
ws = null;
}
function ws_onmessage(e_msg)
{
e_msg = e_msg || window.event; // MessageEvent
alert("msg : " + e_msg.data);
}
function update_view()
{
var canvas = document.getElementById("remote");
var ctx = canvas.getContext("2d");
ctx.clearRect(-trans_x, -trans_y, canvas_width, canvas_height);
ctx.fillStyle="#404040";
ctx.beginPath();
ctx.arc(-plate_width / 2, 0, plate_height / 2, 0.5 * Math.PI, 1.5 * Math.PI);
ctx.lineTo(plate_width / 2, -plate_height / 2);
ctx.arc(plate_width / 2, 0, plate_height / 2, 1.5 * Math.PI, 0.5 * Math.PI);
ctx.lineTo(-plate_width / 2, plate_height / 2);
ctx.fill();
var gradient=ctx.createLinearGradient(0,-circle_radius,0,circle_radius);
gradient.addColorStop(0,"white");
gradient.addColorStop(0.5,"#cceeff");
gradient.addColorStop(1,"white");
ctx.fillStyle=gradient;
ctx.beginPath();
ctx.arc(0, 0, circle_radius, 0 , 2 * Math.PI);
ctx.fill();
var arrow1_right = next_right;
var arrow1_left = next_right - arrow_width;
var arrow2_left = next_right - next_width;
var arrow2_right = arrow2_left + arrow_width;
// Back button
if(click_state == 1)
ctx.fillStyle="#66ffff";
else
ctx.fillStyle=gradient;
ctx.beginPath();
ctx.lineTo(-arrow1_right, 0);
ctx.lineTo(-arrow1_left, next_height / 2);
ctx.lineTo(-arrow1_left, -next_height / 2);
ctx.fill();
ctx.beginPath();
ctx.lineTo(-arrow2_right, 0);
ctx.lineTo(-arrow2_left, next_height / 2);
ctx.lineTo(-arrow2_left, -next_height / 2);
ctx.fill();
// Next button
if(click_state == 2)
ctx.fillStyle="#66ffff";
else
ctx.fillStyle=gradient;
ctx.beginPath();
ctx.lineTo(arrow1_right, 0);
ctx.lineTo(arrow1_left, next_height / 2);
ctx.lineTo(arrow1_left, -next_height / 2);
ctx.fill();
ctx.beginPath();
ctx.lineTo(arrow2_right, 0);
ctx.lineTo(arrow2_left, next_height / 2);
ctx.lineTo(arrow2_left, -next_height / 2);
ctx.fill();
var x = Math.round(inner_radius * Math.cos(Math.PI/3));
var y = Math.round(inner_radius * Math.cos(Math.PI/6));
ctx.fillStyle="#2eb82e";
if(!play_state)
{
// Pausing button
ctx.beginPath();
ctx.lineTo(inner_radius, 0);
ctx.lineTo(-x, y);
ctx.lineTo(-x, -y);
ctx.fill();
}
else
{
// Playing button
x -= 3;
y -= 3;
var bar_width = 14;
ctx.beginPath();
ctx.lineTo(-x - bar_width, -y);
ctx.lineTo(-x - bar_width, y);
ctx.lineTo(-x + bar_width, y);
ctx.lineTo(-x + bar_width, -y);
ctx.fill();
ctx.beginPath();
ctx.lineTo(x - bar_width, -y);
ctx.lineTo(x - bar_width, y);
ctx.lineTo(x + bar_width, y);
ctx.lineTo(x + bar_width, -y);
ctx.fill();
}
// Volume
volume_height += 4;
ctx.fillStyle="#404040";
ctx.beginPath();
ctx.arc(-volume_width / 2, volume_y, volume_height / 2, 0.5 * Math.PI, 1.5 * Math.PI);
ctx.lineTo(volume_width / 2, volume_y - volume_height / 2);
ctx.arc(volume_width / 2, volume_y, volume_height / 2, 1.5 * Math.PI, 0.5 * Math.PI);
ctx.lineTo(-volume_width / 2, volume_y + volume_height / 2);
ctx.fill();
volume_height -= 6;
var temp = volume * volume_width / 30 - volume_width / 2;
ctx.fillStyle="#2eb82e";
ctx.beginPath();
ctx.arc(-volume_width / 2, volume_y, volume_height / 2, 0.5 * Math.PI, 1.5 * Math.PI);
ctx.lineTo(temp, volume_y - volume_height / 2);
ctx.arc(temp, volume_y, volume_height / 2, 1.5 * Math.PI, 0.5 * Math.PI);
ctx.lineTo(-volume_width / 2, volume_y + volume_height / 2);
ctx.fill();
volume_height += 2;
ctx.fillStyle="white";
ctx.beginPath();
ctx.arc(temp, volume_y, volume_height*2, 0, 2 * Math.PI);
ctx.fill();
}
function mouse_down()
{
if(ws == null)
return;
event.preventDefault();
var x, y;
if(event.offsetX)
{
x = event.offsetX - trans_x;
y = event.offsetY - trans_y;
}
else if(event.layerX)
{
x = event.layerX - trans_x;
y = event.layerY - trans_y;
}
else
{
x = (Math.round(event.touches[0].pageX - event.touches[0].target.offsetLeft)) - trans_x;
y = (Math.round(event.touches[0].pageY - event.touches[0].target.offsetTop)) - trans_y;
}
var radius = Math.sqrt(x*x + y*y);
if(radius < inner_radius)
{
// pause/play button is click
play_state = (play_state + 1)%2;
if(play_state)
ws.send("P" + "0\r\n");
else
ws.send("S" + "0\r\n");
}
else if((y < next_top) && (y > -next_top))
{
if((x < next_right) && (x > (next_right-next_width)))
{
ws.send("N" + "0\r\n");
console.log("next button is pressed!");
click_state = 2;
}
else if((x > -next_right) && (x < -(next_right-next_width)))
{
ws.send("B" + "0\r\n");
console.log("back button is pressed!");
click_state = 1;
}
}
else
{
if((y > (volume_y - volume_height*3))
&& (y < (volume_y + volume_height*3))
&& (x < (volume_width / 2))
&& (x > -(volume_width / 2)))
{
volume = Math.round((volume_width / 2 + x)/ volume_width *30);
ws.send("V" + volume.toString() + "\r\n");
console.log("volume changed!");
}
}
update_view();
}
function mouse_up()
{
if(ws == null)
return;
event.preventDefault();
click_state = 0;
update_view();
}
function mouse_move()
{
if(ws == null)
return;
event.preventDefault();
var x, y;
if(event.offsetX)
{
x = event.offsetX - trans_x;
y = event.offsetY - trans_y;
}
else if(event.layerX)
{
x = event.layerX - trans_x;
y = event.layerY - trans_y;
}
else
{
x = (Math.round(event.touches[0].pageX - event.touches[0].target.offsetLeft)) - trans_x;
y = (Math.round(event.touches[0].pageY - event.touches[0].target.offsetTop)) - trans_y;
}
if((y > (volume_y - volume_height*3))
&& (y < (volume_y + volume_height*3))
&& (x < (volume_width / 2))
&& (x > -(volume_width / 2)))
{
volume = Math.round((volume_width / 2 + x)/ volume_width *30);
ws.send("V" + volume.toString() + "\r\n");
console.log("volume changed!");
}
update_view();
}
window.onload = init;
</script>
</head>
<body>
<p>
<h1>Web Remote Control / IoT MP3 Player</h1>
</p>
<canvas id="remote"></canvas>
<h2>
<p>
WebSocket : <span id="ws_state">null</span>
</p>
<button id="bt_connect" type="button" onclick="connect_onclick();">Connect</button>
</h2>
</body>
</html>
Upload it to PHPoC shield using PHPoC debugger according to this instruction http://www.phpoc.com/support/manual/...d=major_upload
Note that: This Web UI contains command set to send to Arduino
Write Arduino Code
- Install library for Arduino on Arduino IDE (see http://www.phpoc.com/support/manual/...=library_setup ) and restart Arduino IDE.
- On Arduino IDE, go to File -> Examples -> Phpoc -> WebRemoteSlide
- Modify the example
Code:
#include "SPI.h"
#include "Phpoc.h"
#include <AltSoftSerial.h>
#define ARDUINO_RX 8 // should connect to TX of the Serial MP3 Player module
#define ARDUINO_TX 9 // connect to RX of the module
AltSoftSerial mySerial(ARDUINO_RX, ARDUINO_TX);
static int8_t Send_buf[8] = {0} ;
#define CMD_PLAY_NEXT 0x01
#define CMD_PLAY_PREV 0x02
#define CMD_PLAY_W_INDEX 0x03
#define CMD_SET_VOLUME 0x06
#define CMD_SEL_DEV 0x09
#define CMD_PLAY_W_VOL 0x22
#define CMD_PLAY 0x0D
#define CMD_PAUSE 0x0E
#define CMD_SINGLE_CYCLE 0x19
#define DEV_TF 0x02
#define SINGLE_CYCLE_ON 0x00
#define SINGLE_CYCLE_OFF 0x01
// Arduino web server
PhpocServer server(80);
char name;
int value;
void setup() {
mySerial.begin(9600);
delay(500); // wait chip initialization is complete
sendCommand(CMD_SEL_DEV, DEV_TF); // select the TF card
delay(200); // wait for 200ms
Serial.begin(9600);
while(!Serial)
;
Phpoc.begin(PF_LOG_SPI | PF_LOG_NET);
//Phpoc.begin();
server.beginWebSocket("remote_slide");
Serial.print("WebSocket server address : ");
Serial.println(Phpoc.localIP());
}
void loop() {
// wait for a new client:
PhpocClient client = server.available();
if (client) {
String slideStr = client.readLine();
if(slideStr)
{
name = slideStr.charAt(0);
value = slideStr.substring(1).toInt();
if(name == 'P')
{
Serial.println("Play mp3");
sendCommand(CMD_PLAY, 0x0000);
}
if(name == 'S')
{
Serial.println("Pause mp3");
sendCommand(CMD_PAUSE, 0x0000);
}
if(name == 'N')
{
Serial.println("Play next mp3");
sendCommand(CMD_PLAY_NEXT, 0x0000);
}
if(name == 'B')
{
Serial.println("Play previous mp3");
sendCommand(CMD_PLAY_PREV, 0x0000);
}
if(name == 'V')
{
Serial.print("Change volume to ");
Serial.println(value);
sendCommand(CMD_SET_VOLUME, value);
}
}
}
}
void sendCommand(int8_t command, int16_t dat)
{
delay(20);
Send_buf[0] = 0x7e; // starting byte
Send_buf[1] = 0xff; // version
Send_buf[2] = 0x06; // the number of bytes of the command without starting byte and ending byte
Send_buf[3] = command; //
Send_buf[4] = 0x00; // 0x00 = no feedback, 0x01 = feedback
Send_buf[5] = (int8_t)(dat >> 8); // datah
Send_buf[6] = (int8_t)(dat); // datal
Send_buf[7] = 0xef; // ending byte
for(uint8_t i=0; i<8; i++)
{
mySerial.write(Send_buf[i]) ;
}
}
Testing
- Click serial button on Arduino IDE to see the IP address
- Open web browser, type http://replace_ip_address/remote_mp3.php
- Click connect button and test it.