mon projet: un capteur SHT75 qui capte l´humidité et la température de la serre avec deux leds pour tester sur l´isis: lorsque la température est supérieure ou égale 30°c la led rouge s´allume si non elle ne s´allume par et même cas pour l´humidité si elle est supérieure a 60 la led vert
s´allume... :mon programme est verifie sur l arduino mes il ne marche pas sur l isis voici men programme:
int SHT_clockPin = 3; // pin used for clock
int SHT_dataPin = 2; // pin used for data
const int led1 = 6;
int temperature;
int humidity;
void setup(){
pinMode(led1, OUTPUT); // configurer la broche comme sortie
// Serial.begin(9600); // open serial at 9600 bps
}
void loop(){
int value = analogRead(A0); // la LDR est liée à la broche analogique 0
// LED 1
if (value > 30)
{
digitalWrite ( led1, HIGH ) ;
}
else {
digitalWrite ( led1, LOW ) ;
}
//these can take a bit to get the values (100ms or so)
//float temperature = getTemperature();
// float humidity = getHumidity();
Serial.print(temperature);
Serial.print(" | ");
Serial.println(humidity);
}
float getTemperature(){
//Return Temperature in Celsius
SHT_sendCommand(B00000011, SHT_dataPin, SHT_clockPin);
SHT_waitForResult(SHT_dataPin);
int val = SHT_getData(SHT_dataPin, SHT_clockPin);
SHT_skipCrc(SHT_dataPin, SHT_clockPin);
return (float)val * 0.01 - 40; //convert to celsius
}
float getHumidity(){
//Return Relative Humidity
SHT_sendCommand(B00000101, SHT_dataPin, SHT_clockPin);
SHT_waitForResult(SHT_dataPin);
int val = SHT_getData(SHT_dataPin, SHT_clockPin);
SHT_skipCrc(SHT_dataPin, SHT_clockPin);
return -4.0 + 0.0405 * val + -0.0000028 * val * val;
}
void SHT_sendCommand(int command, int dataPin, int clockPin){
// send a command to the SHTx sensor
// transmission start
pinMode(dataPin, OUTPUT);
pinMode(clockPin, OUTPUT);
digitalWrite(dataPin, HIGH);
digitalWrite(clockPin, HIGH);
digitalWrite(dataPin, LOW);
digitalWrite(clockPin, LOW);
digitalWrite(clockPin, HIGH);
digitalWrite(dataPin, HIGH);
digitalWrite(clockPin, LOW);
// shift out the command (the 3 MSB are address and must be 000, the last 5 bits are the command)
shiftOut(dataPin, clockPin, MSBFIRST, command);
// verify we get the right ACK
digitalWrite(clockPin, HIGH);
pinMode(dataPin, INPUT);
if (digitalRead(dataPin)) Serial.println("ACK error 0");
digitalWrite(clockPin, LOW);
if (!digitalRead(dataPin)) Serial.println("ACK error 1");
}
void SHT_waitForResult(int dataPin){
// wait for the SHTx answer
pinMode(dataPin, INPUT);
int ack; //acknowledgement
//need to wait up to 2 seconds for the value
for (int i = 0; i < 1000; ++i){
delay(2);
ack = digitalRead(dataPin);
if (ack == LOW) break;
}
if (ack == HIGH) Serial.println("ACK error 2");
}
int SHT_getData(int dataPin, int clockPin){
// get data from the SHTx sensor
// get the MSB (most significant bits)
pinMode(dataPin, INPUT);
pinMode(clockPin, OUTPUT);
byte MSB = shiftIn(dataPin, clockPin, MSBFIRST);
// send the required ACK
pinMode(dataPin, OUTPUT);
digitalWrite(dataPin, HIGH);
digitalWrite(dataPin, LOW);
digitalWrite(clockPin, HIGH);
digitalWrite(clockPin, LOW);
// get the LSB (less significant bits)
pinMode(dataPin, INPUT);
byte LSB = shiftIn(dataPin, clockPin, MSBFIRST);
return ((MSB << 8) | LSB); //combine bits
}
void SHT_skipCrc(int dataPin, int clockPin){
// skip CRC data from the SHTx sensor
pinMode(dataPin, OUTPUT);
pinMode(clockPin, OUTPUT);
digitalWrite(dataPin, HIGH);
digitalWrite(clockPin, HIGH);
digitalWrite(clockPin, LOW);
}