Ok, I think I have it now.
Maybe someone could check my code and see if I did it right?
#include <LiquidCrystal.h>
LiquidCrystal lcd(8, 9, 4, 5, 6, 7);
int lcd_key = 0;
int adc_key_in = 0;
#define btnRIGHT 0
#define btnUP 1
#define btnDOWN 2
#define btnLEFT 3
#define btnSELECT 4
#define btnNONE 5
// read the buttons
int read_LCD_buttons()
{
adc_key_in = analogRead(0); // read the value from the sensor
// my buttons when read are centered at these valies: 0, 144, 329, 504, 741
// we add approx 50 to those values and check to see if we are close
if (adc_key_in > 1000) return btnNONE; // We make this the 1st option for speed reasons since it will be the most likely result
// For V1.1 us this threshold
if (adc_key_in < 50) return btnRIGHT;
if (adc_key_in < 250) return btnUP;
if (adc_key_in < 450) return btnDOWN;
if (adc_key_in < 650) return btnLEFT;
if (adc_key_in < 850) return btnSELECT;
return btnNONE; // when all others fail, return this...
}
#define DHT11_PIN 0 // ADC0 Define the ANALOG Pin connected to DHT11 Sensor
int temp1[3]; //Temp1, temp2, hum1 & hum2 are the final integer values that you are going to use in your program.
int temp2[3]; // They update every 2 seconds.
int hum1[3];
int hum2[3];
byte read_dht11_dat()
{
byte i = 0;
byte result=0;
for(i=0; i< 8; i++){
while(!(PINC & _BV(DHT11_PIN))); // wait for 50us
delayMicroseconds(30);
if(PINC & _BV(DHT11_PIN))
result |=(1<<(7-i));
while((PINC & _BV(DHT11_PIN))); // wait '1' finish
}
return result;
}
long dht11delay_previousMillis = 0; // will store last time LED was updated
long dht11delay_interval = 1000; // dht11delay_interval at which to blink (milliseconds)
void setup()
{
DDRC |= _BV(DHT11_PIN);
PORTC |= _BV(DHT11_PIN);
Serial.begin(9600);
delay(100);
}
void loop()
{
unsigned long dht11delay_currentMillis = millis();
if(dht11delay_currentMillis - dht11delay_previousMillis > dht11delay_interval) {
// save the last time you blinked the LED
dht11delay_previousMillis = dht11delay_currentMillis;
byte dht11_dat[5];
byte dht11_in;
byte i;
// start condition
// 1. pull-down i/o pin from 18ms
PORTC &= ~_BV(DHT11_PIN);
delay(18);
PORTC |= _BV(DHT11_PIN);
delayMicroseconds(40);
DDRC &= ~_BV(DHT11_PIN);
delayMicroseconds(40);
dht11_in = PINC & _BV(DHT11_PIN);
if(dht11_in){
Serial.println("dht11 start condition 1 not met");
return;
}
delayMicroseconds(80);
dht11_in = PINC & _BV(DHT11_PIN);
if(!dht11_in){
Serial.println("dht11 start condition 2 not met");
return;
}
delayMicroseconds(80);
// now ready for data reception
for (i=0; i<5; i++)
dht11_dat[i] = read_dht11_dat();
DDRC |= _BV(DHT11_PIN);
PORTC |= _BV(DHT11_PIN);
byte dht11_check_sum = dht11_dat[0]+dht11_dat[1]+dht11_dat[2]+dht11_dat[3];
// check check_sum
if(dht11_dat[4]!= dht11_check_sum)
{
Serial.println("DHT11 checksum error");
}
temp1[0]=dht11_dat[2];
temp2[0]=dht11_dat[3];
lcd.begin(16,2);
lcd.setCursor(0,0);
lcd.print("Tmp:");
lcd.print(temp1[0]);
lcd.print("c ");
lcd.print("WB:");
lcd.print(5.391260E-01*temp1[0] + 1.047837E-01*hum1[0] + -7.493556E-04*hum1[0]*hum1[0] + -1.077432E-03*hum1[0]*hum1[0] + 6.414631E-03*temp1[0]*hum1[0] + 5.151526E+00);
hum1[0]=dht11_dat[0];
hum2[0]=dht11_dat[1];
lcd.setCursor(0,1);
lcd.print("Hum:");
lcd.print(hum1[0]);
lcd.print("%");
}
}
// END OF CODE