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ArduinoExchange.ino
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ArduinoExchange.ino
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/*
* ArduinoExchange
*
* Based on the "Decadic Dial Decoder and Switching Controller" by Beau Walker from bjshed.better-than.tv. Emulates
* a telephone exchange, allowing old pulse dialing phones to call each other.
*
* Original project at http://bjshed.better-than.tv/projects/electronics/rotary_arduino_exchange/
*
* This sketch extends the original project by allowing more than 2 phones (yet to be tested!). It also adds busy
* and ringback tones.
*
* The ringer generator code is also different. It supports a PCR-SIN03V12F20-C ring generator which generates the 90VAC
* ring voltage. This device is switched on and off via an "inhibit" signal (which is just 5V) from the Arduino.
*
* This sketch uses a Microview to display infomation about the exchange's status.
*
*/
#include <MicroView.h>
const int lines = 2;
// define the phone numbers
const char * numbers[lines] = {"440", "441"};
//loop detection for A & B phones
const int loops[lines] = {A1, A0};
//Relay Switch for Ring / Speech
const int rings[lines] = {3, 2};
// ringing generator inhibit
const int ring_gen_inhibit = 6;
//tone output pin - this generates the sqaure wave that feeds the bandpass filter
int toneOut = 5;
const int dialling_timeout = 10000;
int needToPrint = 0;
int count;
int lastState = LOW;
int trueState = LOW;
long lastStateChangeTime = 0;
boolean offhook = boolean();
boolean allowdialtone = boolean();
int offhook_line;
// constants
int dialHasFinishedRotatingAfterMs = 100;
int debounceDelay = 10;
String diallednumber = String();
long timeout = millis(); //must be long to fit all of that milli goodness over time.
long ring = millis();
void setup()
{
pinMode(ring_gen_inhibit, OUTPUT);
digitalWrite(ring_gen_inhibit, HIGH);
pinMode(toneOut, OUTPUT);
offhook = false;
allowdialtone = true;
for (int i = 0; i < lines; i++) {
pinMode(loops[i], INPUT_PULLUP);
pinMode(rings[i], OUTPUT);
}
Serial.begin(9600);
Serial.println("Arduino Exchange");
uView.begin(); // start MicroViewuView.clear(PAGE);
uView.clear(PAGE);
uView.setCursor(10, 0);
uView.print("Arduino");
uView.setCursor(8, 10);
uView.print("Exchange");
uView.display();
uView.setCursor(19, 25);
uView.print("Idle");
uView.display();
delay(2000);
}
/*
* Tonescript: 400@-19,425@-19,450@-19;10(* /0/1+2+3)
*/
void dialtone()
{
if (allowdialtone == true) {
int freq1 = 400;
int freq2 = 425;
int freq3 = 450;
int duration_divider = 15;
// to "combine" the two tones we play them idividually, one after the other, really quickly (every duration_divider ms)
tone(toneOut, freq1, duration_divider);
delay(duration_divider);
tone(toneOut, freq2, duration_divider);
delay(duration_divider);
tone(toneOut, freq3, duration_divider);
delay(duration_divider);
//reset timout for dialing too
timeout = millis();
}
}
/*
* Tonescript: 425@-19;10(.375/.375/1)
*/
void busytone()
{
int frequency = 425;
int on_duration = 375;
int off_duration = 375;
tone(toneOut, frequency, on_duration);
delay(on_duration);
delay(off_duration);
}
/*
* Tonescript: 400@-16,435@-17;*(.4/.2/1+2,.4/.2/1+2,2/0/0)
*/
void ringbacktone()
{
int frequency1 = 425;
int frequency2 = 435;
int on_duration = 400;
int off_duration = 200;
int pause_duration = 2000;
int duration_divider = 15;
// parts one and two are identical, 400ms on, 200ms off. To "combine" the two tones we play them idividually, one after the other, really quickly (every duration_divider ms)
for(int i=0; i<2; i++) {
for(int j=0; j<on_duration; j=j+duration_divider) {
// freq 1
tone(toneOut, frequency1, duration_divider);
delay(duration_divider);
// freq 2
tone(toneOut, frequency2, duration_divider);
delay(duration_divider);
}
delay(off_duration);
}
// part three - just a pause...
delay(pause_duration);
}
void trigger_ringer()
{
digitalWrite(ring_gen_inhibit, LOW);
delay(100);
digitalWrite(ring_gen_inhibit, HIGH);
}
void ringer()
{
//stop dialtone whilst ringing
allowdialtone = false;
// Aussie ring tone
// 500ms on 250ms off 1000ms space.
//
if (millis() - ring <= 400) {
// ring phone for 400ms
trigger_ringer();
}
if ((millis() - ring >= 600) && (millis() - ring <= 1000)) {
//ring again after 250ms break
trigger_ringer();
}
if (millis() - ring >= 3000) {
//ring again after 2000ms break
ring = millis();
}
if ((millis() - ring >= 1000) && (millis() - ring <= 3000)) {
ringbacktone();
}
}
/*
* Based on http://www.instructables.com/id/Interface-a-rotary-phone-dial-to-an-Arduino/step4/Develop-the-code/
*/
void decodenumber()
{
//if number is 3 numbers then check if it's correct
while (diallednumber.length() != 3 ) {
//check for digit
int reading = digitalRead(loops[offhook_line]);
if ((millis() - timeout) >= dialling_timeout) {
//if timeout reached clear dialled numbers
timeout = millis();
diallednumber = "";
lastState = LOW;
// update display
Serial.println("Dialling timeout, try again");
while (digitalRead(loops[offhook_line]) == LOW) {
//generate busytone
busytone();
}
return;
}
if ((millis() - lastStateChangeTime) > dialHasFinishedRotatingAfterMs) {
// the dial isn't being dialed, or has just finished being dialed.
if (needToPrint) {
// if it's only just finished being dialed, we need to send the number down the serial
// line and reset the count. We mod the count by 10 because '0' will send 10 pulses.
diallednumber = diallednumber + count % 10, DEC;
Serial.println("Dialled number: " + diallednumber);
uView.clear(PAGE);
uView.setCursor(0, 10);
uView.print("Dialing...");
uView.setCursor(20, 30);
uView.print(diallednumber);
uView.display();
needToPrint = 0;
count = 0;
timeout = millis();
}
}
if (reading != lastState) {
lastStateChangeTime = millis();
}
if ((millis() - lastStateChangeTime) > debounceDelay) {
// debounce - this happens once it's stablized
if (reading != trueState) {
// this means that the switch has either just gone from closed->open or vice versa.
trueState = reading;
if (trueState == HIGH) {
// increment the count of pulses if it's gone high.
count++;
needToPrint = 1; // we'll need to print this number (once the dial has finished rotating)
}
}
}
lastState = reading;
// detect if the phone goes back on-hook (i.e. goes HIGH and stays HIGH)
if(lastState == HIGH && (millis() - lastStateChangeTime) > 2000) {
timeout = millis();
diallednumber = "";
lastState = LOW;
Serial.println("hungup without dialling");
return;
}
}
checknumber();
}
void checknumber() {
int dialled_line = -1;
for (int i = 0; i < lines; i++) {
if (diallednumber == numbers[i]) {
dialled_line = i;
}
}
if (dialled_line > -1 && offhook_line != dialled_line) {
String msg = numbers[offhook_line];
msg.concat(" -> ");
msg.concat(numbers[dialled_line]);
Serial.println(msg);
Serial.println("Ringing...");
uView.clear(PAGE);
uView.setCursor(0, 10);
uView.print(msg);
uView.setCursor(0, 20);
uView.print("Ringing... ");
uView.display();
//set calling party relay on
digitalWrite(rings[offhook_line], HIGH);
while (digitalRead(loops[dialled_line]) == HIGH) {
// ring until A picks up
ringer();
// drop call if caller hangs up
if (digitalRead(loops[offhook_line]) == HIGH) {
break;
}
}
delay(100);
//digitalWrite(rings[offhook_line], LOW);
digitalWrite(rings[dialled_line], HIGH);
while (digitalRead(loops[offhook_line]) == LOW) {
//stay here unitl call is completed.
Serial.println("Talking...");
uView.setCursor(0, 20);
uView.print("Talking... ");
uView.display();
delay (10);
}
Serial.println("* Hungup *");
uView.setCursor(0, 20);
uView.print("* Hungup *");
uView.display();
digitalWrite(rings[dialled_line], LOW);
delay (500);
}
while (digitalRead(loops[offhook_line]) == LOW) {
//generate busytone
busytone();
}
}
void loop()
{
for (int i = 0; i < lines; i++) {
while (digitalRead(loops[i]) == LOW && offhook == false) {
offhook_line = i;
offhook = true;
String msg = "Line off-hook: ";
msg.concat(offhook_line);
Serial.println(msg);
uView.clear(PAGE);
uView.setCursor(0, 10);
uView.print(msg);
uView.display();
//set calling party relay on
digitalWrite(rings[offhook_line], HIGH);
while (digitalRead(loops[offhook_line]) == LOW) {
//generate dialtone
dialtone();
}
// reset ready to try again
diallednumber = "";
timeout = millis();
ring = millis();
lastState = LOW;
decodenumber();
}
}
if(offhook != false) { //ensures this is only printed once after phones are back on-hook, otherwise microview flickers with constant looping
uView.clear(PAGE);
uView.setCursor(10, 0);
uView.print("Arduino");
uView.setCursor(8, 10);
uView.print("Exchange");
uView.display();
uView.setCursor(19, 25);
uView.print("Idle");
uView.display();
}
offhook = false;
allowdialtone = true;
//set calling party relay off
for (int i = 0; i < lines; i++) {
digitalWrite(rings[i], LOW);
}
}