Page 143 - MDP2020-1

················································································ 명장양성프로젝트 【MDP】 과제발표회 자료집 Ⅰ | 137

#define LCD_D6 21 //Data pin 6
#define LCD_D7 14 //Data pin 7
#define MAXTIMINGS 85
#define DHTPIN 7

int lcd;
int dht11_dat[5] = {0, 0, 0, 0, 0};

void read_dht11_dat()
{
uint8_t laststate = HIGH;
uint8_t counter = 0;
uint8_t j = 0, i;
float f;

dht11_dat[0] = dht11_dat[1] = dht11_dat[2] = dht11_dat[3] = dht11_dat[4] = 0;

pinMode(DHTPIN, OUTPUT);
digitalWrite(DHTPIN, LOW);
delay(18);

digitalWrite(DHTPIN, HIGH);
delayMicroseconds(40);

pinMode(DHTPIN, INPUT);

for (i = 0; i < MAXTIMINGS; i++)
{
counter = 0;
while (digitalRead(DHTPIN) == laststate)
{
counter++;
delayMicroseconds(1);
if (counter == 255)
{
break;
}
}
laststate = digitalRead(DHTPIN);

if (counter == 255)
break;
if ((i >= 4) && (i % 2 == 0))
{
dht11_dat[j / 8] <<= 1;
if (counter > 16)
dht11_dat[j / 8] |= 1;
j++;
}
}

if ((j >= 40) && (dht11_dat[4] == ((dht11_dat[0] + dht11_dat[1] + dht11_dat[2] +
dht11_dat[3]) & 0xFF)))
{