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Dependencies:   mbed

Fork of tarefa1 by Pedro Mendes

Tarefa1.cpp@4:ee911115dcb6, 2015-03-19 (annotated)

Committer:
pmcmendes
Date:
Thu Mar 19 12:50:26 2015 +0000
Revision:
4:ee911115dcb6
Parent:
3:14310c47674c 
para fazer tarefa 2

Who changed what in which revision?

UserRevisionLine numberNew contents of line
pmcmendes 0:cce430bf36f7 1 // Mede dois sinais
pmcmendes 0:cce430bf36f7 2 #include <stdio.h>
pmcmendes 0:cce430bf36f7 3
pmcmendes 0:cce430bf36f7 4 #include <stdlib.h>
pmcmendes 0:cce430bf36f7 5 #include "mbed.h"
pmcmendes 0:cce430bf36f7 6 #include "math.h" // Descomente esta linha caso queira usar funções como sin(x)
pmcmendes 0:cce430bf36f7 7
pmcmendes 0:cce430bf36f7 8 #define ESCALA_DE_TENSAO 3.3
pmcmendes 4:ee911115dcb6 9
pmcmendes 4:ee911115dcb6 10 #define ESCALA_DE_TENSAO_AC 3.3
pmcmendes 4:ee911115dcb6 11 #define ESCALA_DE_TENSAO_DC 3.3
pmcmendes 0:cce430bf36f7 12 #define TAM_VALORES_MEDIA_AMPLITUDE 10
pmcmendes 4:ee911115dcb6 13 #define LIMITE_RECONHECIMENTO_PICO 0.8
pmcmendes 0:cce430bf36f7 14
pmcmendes 3:14310c47674c 15 Timer t;
pmcmendes 0:cce430bf36f7 16 Ticker flipper;
pmcmendes 0:cce430bf36f7 17 AnalogIn ain0(PTB0);
pmcmendes 0:cce430bf36f7 18 AnalogIn ain1(PTB1);
pmcmendes 0:cce430bf36f7 19 DigitalOut myled(LED1);
pmcmendes 0:cce430bf36f7 20 int aux2 = 0; // Variavel auxiliar, para indicar quando realizar uma amostragem
pmcmendes 0:cce430bf36f7 21
pmcmendes 3:14310c47674c 22 typedef struct {
pmcmendes 3:14310c47674c 23 float valorMedido;
pmcmendes 3:14310c47674c 24 float tempo;
pmcmendes 3:14310c47674c 25 } Medida;
pmcmendes 3:14310c47674c 26
pmcmendes 0:cce430bf36f7 27 void flip() {
pmcmendes 0:cce430bf36f7 28 aux2 = !aux2;
pmcmendes 0:cce430bf36f7 29 }
pmcmendes 0:cce430bf36f7 30
pmcmendes 0:cce430bf36f7 31 int compare (const void* a, const void * b) {
pmcmendes 4:ee911115dcb6 32 const float *ia = (const float *) a;
pmcmendes 4:ee911115dcb6 33 const float *ib = (const float *) b;
pmcmendes 4:ee911115dcb6 34
pmcmendes 4:ee911115dcb6 35 if ((*ia) < (*ib)) return 1;
pmcmendes 4:ee911115dcb6 36 if ((*ia) > (*ib)) return -1;
pmcmendes 4:ee911115dcb6 37 else return 0;
pmcmendes 0:cce430bf36f7 38 }
pmcmendes 0:cce430bf36f7 39
pmcmendes 0:cce430bf36f7 40 float calculaMedia(float *vetorValores, int tamVetorValores) {
pmcmendes 4:ee911115dcb6 41 float soma = 0;
pmcmendes 4:ee911115dcb6 42 for (int i = 0; i < tamVetorValores; i++) {
pmcmendes 4:ee911115dcb6 43 if (vetorValores[i] < ESCALA_DE_TENSAO) soma += vetorValores[i];
pmcmendes 4:ee911115dcb6 44 }
pmcmendes 4:ee911115dcb6 45 return (soma / tamVetorValores);
pmcmendes 0:cce430bf36f7 46 }
pmcmendes 0:cce430bf36f7 47
pmcmendes 4:ee911115dcb6 48 double calculaAmplitude(float * vetorMedidas, int tamVetorMedidas) {
pmcmendes 4:ee911115dcb6 49 const int tamValores = TAM_VALORES_MEDIA_AMPLITUDE;
pmcmendes 4:ee911115dcb6 50 float valoresMaximos[tamValores];
pmcmendes 4:ee911115dcb6 51 float valoresMinimos[tamValores];
pmcmendes 4:ee911115dcb6 52 float mediaValoresMaximos, mediaValoresMinimos;
pmcmendes 4:ee911115dcb6 53 qsort(vetorMedidas, tamVetorMedidas, sizeof(float), compare);
pmcmendes 1:6e573b77c775 54
pmcmendes 4:ee911115dcb6 55 for (int i = 0; i < tamValores; i++) {
pmcmendes 4:ee911115dcb6 56 valoresMaximos[i] = vetorMedidas[i];
pmcmendes 4:ee911115dcb6 57 valoresMinimos[i] = vetorMedidas[(tamVetorMedidas - 1) - i];
pmcmendes 4:ee911115dcb6 58 }
pmcmendes 0:cce430bf36f7 59
pmcmendes 4:ee911115dcb6 60 mediaValoresMaximos = calculaMedia(valoresMaximos, tamValores);
pmcmendes 4:ee911115dcb6 61 mediaValoresMinimos = calculaMedia(valoresMinimos, tamValores);
pmcmendes 0:cce430bf36f7 62
pmcmendes 4:ee911115dcb6 63 float amplitude = (mediaValoresMaximos - mediaValoresMinimos);
pmcmendes 4:ee911115dcb6 64
pmcmendes 0:cce430bf36f7 65
pmcmendes 4:ee911115dcb6 66 printf("Media superior: %.2f Media inferior: %.2f Amplitude pico-a-pico: %.2f\n\r", mediaValoresMaximos, mediaValoresMinimos, amplitude);
pmcmendes 4:ee911115dcb6 67 return amplitude;
pmcmendes 1:6e573b77c775 68 }
pmcmendes 1:6e573b77c775 69
pmcmendes 4:ee911115dcb6 70 float * filtrarMatrizPorAmplitudeMinima(float * vetorMedidas, int tamVetorMedidas, float limite) {
pmcmendes 4:ee911115dcb6 71 return NULL;
pmcmendes 4:ee911115dcb6 72 }
pmcmendes 4:ee911115dcb6 73
pmcmendes 4:ee911115dcb6 74 float calculaTensaoDC(float *vetorMedidas, int tamVetorMedidas) {
pmcmendes 4:ee911115dcb6 75 return calculaMedia(vetorMedidas, tamVetorMedidas);
pmcmendes 4:ee911115dcb6 76 }
pmcmendes 1:6e573b77c775 77
pmcmendes 4:ee911115dcb6 78 float calculaTensaoACSenoidal(float *vetorMedidas, int tamVetorMedidas, float tensaoDC) {
pmcmendes 4:ee911115dcb6 79 float amplitude = calculaAmplitude(vetorMedidas, tamVetorMedidas);
pmcmendes 4:ee911115dcb6 80 float tensaoEficazAC = amplitude/sqrt((float) 2);
pmcmendes 4:ee911115dcb6 81 float tensaoTotal = sqrt(tensaoEficazAC*tensaoEficazAC + tensaoDC*tensaoDC);
pmcmendes 4:ee911115dcb6 82 //printf("Amplitude:%.2f Tensao Eficaz AC: %.2f Tensao DC: %.2f \n\r", amplitude, tensaoEficazAC, tensaoDC);
pmcmendes 4:ee911115dcb6 83 return tensaoTotal;
pmcmendes 0:cce430bf36f7 84 }
pmcmendes 0:cce430bf36f7 85
pmcmendes 4:ee911115dcb6 86 float calculaTensaoACPeriodica(float *vetorMedidas, int tamVetorMedidas) {
pmcmendes 4:ee911115dcb6 87 // detectar picos, tempo de execucao, preciso de periodo e velocidade
pmcmendes 4:ee911115dcb6 88 // v = lambda * f
pmcmendes 4:ee911115dcb6 89 // mesmo assim preciso de ideia de tempo
pmcmendes 4:ee911115dcb6 90 float n = 0;
pmcmendes 4:ee911115dcb6 91 for(int i = 0; i < tamVetorMedidas; i++)
pmcmendes 4:ee911115dcb6 92 n += vetorMedidas[i]*vetorMedidas[i] * 0.0001;
pmcmendes 4:ee911115dcb6 93 return sqrt(n / 0.1);
pmcmendes 4:ee911115dcb6 94
pmcmendes 4:ee911115dcb6 95 }
pmcmendes 4:ee911115dcb6 96
pmcmendes 4:ee911115dcb6 97
pmcmendes 0:cce430bf36f7 98 int main()
pmcmendes 0:cce430bf36f7 99 { // valor mínimo de ts: ~0.0001 (10 kHz)
pmcmendes 3:14310c47674c 100 int contador = 0, tamanho=1000; // Tamanho dos vetores de amostras.
pmcmendes 0:cce430bf36f7 101 float ts = 0.0001, sinal0[tamanho], sinal1[tamanho], n1= 0, sinalDC;
pmcmendes 4:ee911115dcb6 102 wait(1);
pmcmendes 0:cce430bf36f7 103 myled = 0; // Acende led
pmcmendes 0:cce430bf36f7 104 flipper.attach(&flip, ts); // chama a funcao flip apos ts segundos
pmcmendes 0:cce430bf36f7 105 while(contador<tamanho) {
pmcmendes 0:cce430bf36f7 106 if(aux2 == 1){
pmcmendes 4:ee911115dcb6 107 sinal0[contador] = ain0 * ESCALA_DE_TENSAO; // lê sinais analógicos de dois canais
pmcmendes 4:ee911115dcb6 108 sinal1[contador] = ain1 * ESCALA_DE_TENSAO;
pmcmendes 0:cce430bf36f7 109 aux2 = 0;
pmcmendes 0:cce430bf36f7 110 n1 += sinal1[contador];
pmcmendes 0:cce430bf36f7 111 contador++;
pmcmendes 0:cce430bf36f7 112 }
pmcmendes 0:cce430bf36f7 113 }
pmcmendes 0:cce430bf36f7 114
pmcmendes 0:cce430bf36f7 115
pmcmendes 0:cce430bf36f7 116 flipper.detach(); /* para o ticker */
pmcmendes 0:cce430bf36f7 117 myled = 1;
pmcmendes 4:ee911115dcb6 118 printf ("############# MULTIMETRO UPP ##############\n\r");
pmcmendes 4:ee911115dcb6 119
pmcmendes 3:14310c47674c 120
pmcmendes 4:ee911115dcb6 121 float tensaoDC = calculaTensaoDC(sinal1, tamanho);
pmcmendes 4:ee911115dcb6 122 //float tensaoAC = calculaTensaoACSenoidal(sinal1, tamanho, tensaoDC);
pmcmendes 4:ee911115dcb6 123 float tensaoAC = calculaTensaoACPeriodica(sinal1, tamanho);
pmcmendes 4:ee911115dcb6 124 printf("\n\n\n\n");
pmcmendes 4:ee911115dcb6 125 printf ("A tensao DC e: %.2f \n\r", tensaoDC);
pmcmendes 4:ee911115dcb6 126 printf ("A tensao AC e: %.2f \n\n\n\r", tensaoAC);
pmcmendes 0:cce430bf36f7 127
pmcmendes 3:14310c47674c 128
pmcmendes 0:cce430bf36f7 129
pmcmendes 0:cce430bf36f7 130 // Apaga led quando termina
pmcmendes 0:cce430bf36f7 131 // Coloque aqui o seu programa para tratamento dos dados.
pmcmendes 0:cce430bf36f7 132 }
pmcmendes 3:14310c47674c 133
pmcmendes 3:14310c47674c 134
pmcmendes 3:14310c47674c 135