温度センサーLM35DZを使用する。0〜100度まで測定可能
温度センサーの+Vs端子にArduino5V, Voutをアナログ端子(A0〜A5)、GNDにGNDを接続する
アナログ端子は、HIGH/LOW間の1.0V、1.6V、2.0V、2.5V、3.1V…の細かい電圧を読み取れる
読み取った0~5Vの電圧は、0〜1023の値として取得できる。
35だった場合、
35/1023 = 0.034
0.034 * 5 = 0.17V
1V = 100℃
0.17 * 100 = 17℃
#define TERMINAL_A 3
#define TERMINAL_B 4
#define TERMINAL_C 5
#define TERMINAL_D 6
#define TERMINAL_F 7
#define TERMINAL_G 8
#define TERMINAL_H 9
#define TACT_SW 10 // 10番ピンをタクトスイッチ
#define DIGIT_1 11
#define DIGIT_10 12
#define DIGIT_100 13
#define DIGIT_1000 14
#define DP 15 // ドット
#define THERMO_IN 16 // A2端子のため16を指定
byte counter = 0; // Arduinoで使用できる1byteの型
byte state = 0;
byte state_old = 0;
byte buf_num = 0;
int thermo_buf[10];
void led_output(byte num){
switch(num) {
case 0: // 4桁7セグメントではアノードコモンを使用しており、7セグメントLEDの逆
digitalWrite(TERMINAL_A, LOW);
digitalWrite(TERMINAL_B, LOW);
digitalWrite(TERMINAL_C, LOW);
digitalWrite(TERMINAL_D, HIGH);
digitalWrite(TERMINAL_F, LOW);
digitalWrite(TERMINAL_G, LOW);
digitalWrite(TERMINAL_H, LOW);
break;
case 1:
digitalWrite(TERMINAL_A, LOW);
digitalWrite(TERMINAL_B, HIGH);
digitalWrite(TERMINAL_C, HIGH);
digitalWrite(TERMINAL_D, HIGH);
digitalWrite(TERMINAL_F, LOW);
digitalWrite(TERMINAL_G, HIGH);
digitalWrite(TERMINAL_H, HIGH);
break;
case 2:
digitalWrite(TERMINAL_A, LOW);
digitalWrite(TERMINAL_B, LOW);
digitalWrite(TERMINAL_C, HIGH);
digitalWrite(TERMINAL_D, LOW);
digitalWrite(TERMINAL_F, HIGH);
digitalWrite(TERMINAL_G, LOW);
digitalWrite(TERMINAL_H, LOW);
break;
case 3:
digitalWrite(TERMINAL_A, LOW);
digitalWrite(TERMINAL_B, LOW);
digitalWrite(TERMINAL_C, HIGH);
digitalWrite(TERMINAL_D, LOW);
digitalWrite(TERMINAL_F, LOW);
digitalWrite(TERMINAL_G, LOW);
digitalWrite(TERMINAL_H, HIGH);
break;
case 4:
digitalWrite(TERMINAL_A, LOW);
digitalWrite(TERMINAL_B, HIGH);
digitalWrite(TERMINAL_C, LOW);
digitalWrite(TERMINAL_D, LOW);
digitalWrite(TERMINAL_F, LOW);
digitalWrite(TERMINAL_G, HIGH);
digitalWrite(TERMINAL_H, HIGH);
break;
case 5:
digitalWrite(TERMINAL_A, HIGH);
digitalWrite(TERMINAL_B, LOW);
digitalWrite(TERMINAL_C, LOW);
digitalWrite(TERMINAL_D, LOW);
digitalWrite(TERMINAL_F, LOW);
digitalWrite(TERMINAL_G, LOW);
digitalWrite(TERMINAL_H, HIGH);
break;
case 6:
digitalWrite(TERMINAL_A, HIGH);
digitalWrite(TERMINAL_B, LOW);
digitalWrite(TERMINAL_C, LOW);
digitalWrite(TERMINAL_D, LOW);
digitalWrite(TERMINAL_F, LOW);
digitalWrite(TERMINAL_G, LOW);
digitalWrite(TERMINAL_H, LOW);
break;
case 7:
digitalWrite(TERMINAL_A, LOW);
digitalWrite(TERMINAL_B, LOW);
digitalWrite(TERMINAL_C, HIGH);
digitalWrite(TERMINAL_D, HIGH);
digitalWrite(TERMINAL_F, LOW);
digitalWrite(TERMINAL_G, HIGH);
digitalWrite(TERMINAL_H, HIGH);
break;
case 8:
digitalWrite(TERMINAL_A, LOW);
digitalWrite(TERMINAL_B, LOW);
digitalWrite(TERMINAL_C, LOW);
digitalWrite(TERMINAL_D, LOW);
digitalWrite(TERMINAL_F, LOW);
digitalWrite(TERMINAL_G, LOW);
digitalWrite(TERMINAL_H, LOW);
break;
case 9:
digitalWrite(TERMINAL_A, LOW);
digitalWrite(TERMINAL_B, LOW);
digitalWrite(TERMINAL_C, LOW);
digitalWrite(TERMINAL_D, LOW);
digitalWrite(TERMINAL_F, LOW);
digitalWrite(TERMINAL_G, LOW);
digitalWrite(TERMINAL_H, HIGH);
break;
default:
digitalWrite(TERMINAL_A, HIGH);
digitalWrite(TERMINAL_B, HIGH);
digitalWrite(TERMINAL_C, HIGH);
digitalWrite(TERMINAL_D, LOW);
digitalWrite(TERMINAL_F, HIGH);
digitalWrite(TERMINAL_G, HIGH);
digitalWrite(TERMINAL_H, HIGH);
break;
}
}
void setup() {
// 初期化
pinMode(TERMINAL_A, OUTPUT);
pinMode(TERMINAL_B, OUTPUT);
pinMode(TERMINAL_C, OUTPUT);
pinMode(TERMINAL_D, OUTPUT);
pinMode(TERMINAL_F, OUTPUT);
pinMode(TERMINAL_G, OUTPUT);
pinMode(TERMINAL_H, OUTPUT);
pinMode(DP, OUTPUT);
pinMode(DIGIT_1, OUTPUT);
pinMode(DIGIT_10, OUTPUT);
pinMode(DIGIT_100, OUTPUT);
pinMode(DIGIT_1000, OUTPUT);
pinMode(TACT_SW, INPUT); // タクトスイッチに接続した10番ピンをインプットに設定
pinMode(THERMO_IN, INPUT); // 16番ピンをINPUT指定
digitalWrite(DIGIT_1, LOW);
digitalWrite(DIGIT_10, LOW);
digitalWrite(DIGIT_100, LOW);
digitalWrite(DIGIT_1000, LOW);
led_output(counter);
}
void clear_num(void){
digitalWrite(TERMINAL_A, HIGH);
digitalWrite(TERMINAL_B, HIGH);
digitalWrite(TERMINAL_C, HIGH);
digitalWrite(TERMINAL_D, HIGH);
digitalWrite(TERMINAL_F, HIGH);
digitalWrite(TERMINAL_G, HIGH);
digitalWrite(TERMINAL_H, HIGH);
digitalWrite(DP, HIGH);
}
int get_temperature(void){
float thermo_sens;
int thermo;
int thermo_ave = 0;
byte i;
thermo_sens = analogRead(THERMO_IN); // センサー値取得
thermo_sens = ((5*thermo_sens)/1024) * 100; // 温度へ変換
thermo = thermo_sens * 10;
thermo_buf[buf_num] = thermo; // 初期値は0
buf_num++;
if(buf_num > 9){
buf_num = 0;
}
for(i = 0; i < 10; i++){
thermo_ave = thermo_ave + thermo_buf[i];
}
thermo_ave = thermo_ave / 10;
return thermo_ave;
}
void loop() {
int num;
int thermo;
state = digitalRead(TACT_SW); // 電流が流れているとHIGH, 流れていないとLOW
if((state == HIGH) && (state_old == LOW)){
counter++;
} else {
}
if(counter >= 10000){
counter = 0;
}
thermo = get_temperature();
num = thermo/ 1000;
clear_num();
digitalWrite(DIGIT_1000, HIGH);
delay(1);
led_output(num);
delay(5);
digitalWrite(DIGIT_1000, LOW);
num = thermo % 1000;
num = thermo/ 100;
clear_num();
digitalWrite(DIGIT_100, HIGH);
delay(1);
led_output(num);
delay(5);
digitalWrite(DIGIT_100, LOW);
num = thermo % 100;
num = num/ 10;
clear_num();
digitalWrite(DIGIT_10, HIGH);
delay(1);
led_output(num);
delay(5);
digitalWrite(DIGIT_10, LOW);
num = thermo % 10;
clear_num();
digitalWrite(DIGIT_1, HIGH);
delay(1);
led_output(num);
delay(5);
digitalWrite(DIGIT_1, LOW);
state_old = state;
}
配線
あれ、コンパイルして転送したら、突然シリアルポートを読み込まなくなった。
なんだこれ。
一瞬パニクったが、温度センサーの配線が間違っていた模様。表裏をひっくり返して再度実行
出来ました。
Arduinoは中々良い買い物だった。
