TV audio damper (prototype)

Automatically lowers your TV audio output after a programmable hour when it gets over a certain level.

Jan 1, 2021

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audio

home automation

human welfare

Components and supplies

Real Time Clock (RTC)

IR transmitter (generic)

Arduino UNO

IR receiver (generic)

Tools and machines

Prototyping Kit, Breadboard

Apps and platforms

Arduino IDE

Project description

Code

Tv audio damper with watchdog

arduino

The biggest problem is the instability of the microphone due to electrical/static noises or input voltage fluctuations. As example, if the audio goes above the hardware threshold, the output signal of the microphone will constantly remains above the setted threshold resulting in errors. The only way to avoid this (except using a better quality microphone amplifier?) is to restart the device. For this reason, a whatchdog is implemented. future improvements: - choosing threshold and time directly on the board - implement an automatic procedure to record the tv-controller signal leading the use to every kind of tv. - find a safe way to higher the volume to a fixed level - find a hardware design to optimize the audio uptake from tv

1#include <avr/wdt.h>
2#include <Wire.h>
3#include "RTClib.h"
4#include  "IRremote.h"
5
6RTC_DS1307 rtc; //modulo ora
7float media_letture;
8int  lettura;
9
10float media;
11int livello_suono;
12long somma = 0;
13int soglia_sup;
14int  soglia_inf;
15int i;
16int lettura1;
17int lettura2;
18int lettura3;
19int  lettura4;
20unsigned int ora;
21unsigned int  rawData[67] = {4450, 4450, 550,  1700, 500, 1750, 500, 1700, 500, 600, 500, 600, 550, 550, 550, 600, 500, 600, 500,  1750, 500, 1700, 500, 1750, 500, 550, 550, 600, 500, 600, 500, 600, 550, 550, 550,  1700, 500, 1750, 500, 600, 500, 1700, 500, 600, 550, 550, 550, 600, 500, 600, 500,  600, 550, 550, 550, 1700, 500, 600, 500, 1750, 500, 1700, 500, 1750, 500, 1700,  500};
22unsigned int timer;
23IRsend irsend;                                                             //Utilizzare  PIN 3~ per LED IR
24int freq_ir = 38;
25
26void calibrazione() {
27  delay(20);
28  somma = 0;
29  lettura = 0;
30  soglia_sup = 0;
31  soglia_inf = 0;
32  media  = 0;
33  for (i = 0; i < 50; i++) {
34    lettura = analogRead(A0);
35    somma  = somma + lettura;
36    delay(30);
37    digitalWrite(8, HIGH);
38  }
39  
40  media = (somma / 50);
41  soglia_sup = (int)(media) + 2 ; //valore soglia
42  soglia_inf = (int)(media) - 5 ;
43  digitalWrite(8, LOW);
44}
45
46
47void  setup() {
48
49  wdt_disable();
50  rtc.begin();
51
52  pinMode(13, OUTPUT);
53  pinMode(18, OUTPUT);
54  //Serial.begin(9600);
55  calibrazione();
56  wdt_enable(WDTO_500MS);
57}
58
59void  loop() {
60
61
62  DateTime now = rtc.now();     //interroga il modulo ora
63  ora = now.hour(), DEC;
64  //Serial.println(ora);
65  //delay (300);
66  if  (ora >=23 || ora <= 2) {
67    digitalWrite(13, LOW);
68    do {
69      if (analogRead(A0)  > ((int)media + 18) || analogRead(A0) < ((int)media - 34)) {
70        delay(2000);
71      }
72      if (analogRead(A0) > soglia_sup)   {
73        irsend.sendRaw(rawData,  67, freq_ir);
74        digitalWrite(13, HIGH);
75        //Serial.println(analogRead(A0));
76        delay(200);
77        lettura1 = analogRead(A0);
78        delay(100);
79        lettura2 = analogRead(A0);
80        delay(100);
81        lettura3 =  analogRead(A0);
82        somma = lettura1 + lettura2 + lettura3;
83        media  = somma / 3;
84        if (int(media) > soglia_sup + 1) {
85          delay(2000);
86        }
87
88      }
89      else {
90        digitalWrite(13, LOW);
91      }
92      wdt_reset();
93      lettura4 = analogRead(A0);
94    } while (lettura4  <= soglia_sup);
95    wdt_reset();
96  } wdt_reset();
97}

#include <avr/wdt.h>
#include <Wire.h>
#include "RTClib.h"
#include  "IRremote.h"

RTC_DS1307 rtc; //modulo ora
float media_letture;
int  lettura;

float media;
int livello_suono;
long somma = 0;
int soglia_sup;
int  soglia_inf;
int i;
int lettura1;
int lettura2;
int lettura3;
int  lettura4;
unsigned int ora;
unsigned int  rawData[67] = {4450, 4450, 550,  1700, 500, 1750, 500, 1700, 500, 600, 500, 600, 550, 550, 550, 600, 500, 600, 500,  1750, 500, 1700, 500, 1750, 500, 550, 550, 600, 500, 600, 500, 600, 550, 550, 550,  1700, 500, 1750, 500, 600, 500, 1700, 500, 600, 550, 550, 550, 600, 500, 600, 500,  600, 550, 550, 550, 1700, 500, 600, 500, 1750, 500, 1700, 500, 1750, 500, 1700,  500};
unsigned int timer;
IRsend irsend;                                                             //Utilizzare  PIN 3~ per LED IR
int freq_ir = 38;

void calibrazione() {
  delay(20);
  somma = 0;
  lettura = 0;
  soglia_sup = 0;
  soglia_inf = 0;
  media  = 0;
  for (i = 0; i < 50; i++) {
    lettura = analogRead(A0);
    somma  = somma + lettura;
    delay(30);
    digitalWrite(8, HIGH);
  }
  
  media = (somma / 50);
  soglia_sup = (int)(media) + 2 ; //valore soglia
  soglia_inf = (int)(media) - 5 ;
  digitalWrite(8, LOW);
}


void  setup() {

  wdt_disable();
  rtc.begin();

  pinMode(13, OUTPUT);
  pinMode(18, OUTPUT);
  //Serial.begin(9600);
  calibrazione();
  wdt_enable(WDTO_500MS);
}

void  loop() {


  DateTime now = rtc.now();     //interroga il modulo ora
  ora = now.hour(), DEC;
  //Serial.println(ora);
  //delay (300);
  if  (ora >=23 || ora <= 2) {
    digitalWrite(13, LOW);
    do {
      if (analogRead(A0)  > ((int)media + 18) || analogRead(A0) < ((int)media - 34)) {
        delay(2000);
      }
      if (analogRead(A0) > soglia_sup)   {
        irsend.sendRaw(rawData,  67, freq_ir);
        digitalWrite(13, HIGH);
        //Serial.println(analogRead(A0));
        delay(200);
        lettura1 = analogRead(A0);
        delay(100);
        lettura2 = analogRead(A0);
        delay(100);
        lettura3 =  analogRead(A0);
        somma = lettura1 + lettura2 + lettura3;
        media  = somma / 3;
        if (int(media) > soglia_sup + 1) {
          delay(2000);
        }

      }
      else {
        digitalWrite(13, LOW);
      }
      wdt_reset();
      lettura4 = analogRead(A0);
    } while (lettura4  <= soglia_sup);
    wdt_reset();
  } wdt_reset();
}

Downloadable files

TV audio damper

This is the final emitter circuit. Another schematics will be provided for the tv-control signal acquisition.

TV audio damper

This is the final emitter circuit. Another schematics will be provided for the tv-control signal acquisition.

TV audio damper

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