Bueno, pues parece que la cosa va cogiendo textura. Están conectados el sensor de Temperatura y Humedad SHT15 y el barométrico BMP-085, y mostrando los datos por un display Serial LCD de Sparkfun con 16x2 lineas. Lo siguiente es conectar el módulo de almacenamiento de datos SD y el anemómetro Inspeed, poco a poco...
El código que veis aquí, con alguna modificación que otra para que lo muestre en el LCD es este:
/*
* WeatherStation by Lars Schumann (make.larsi.org)
*
* Uses the following senors: SHT15, BMP085, and TEMT6000
*/
#include "Wire.h"
#define PIN_SDA 6
#define PIN_SCL 7
#define I2C_ADDRESS 0x77
const unsigned char oversampling_setting = 3; //oversamplig for measurement
const unsigned char pressure_waittime[4] = { 5, 8, 14, 26 };
//just taken from the BMP085 datasheet
int ac1;
int ac2;
int ac3;
unsigned int ac4;
unsigned int ac5;
unsigned int ac6;
int b1;
int b2;
int mb;
int mc;
int md;
void bmp085_read_temperature_and_pressure(int* temperature, long* pressure) {
long ut = bmp085_read_ut();
long up = bmp085_read_up();
long x1, x2, x3, b3, b5, b6, p;
unsigned long b4, b7;
//calculate the temperature
x1 = ((long)ut - ac6) * ac5 >> 15;
x2 = ((long) mc << 11) / (x1 + md);
b5 = x1 + x2;
*temperature = (b5 + 8) >> 4;
//calculate the pressure
b6 = b5 - 4000;
x1 = (b2 * (b6 * b6 >> 12)) >> 11;
x2 = ac2 * b6 >> 11;
x3 = x1 + x2;
//b3 = (((int32_t) ac1 * 4 + x3)<> 2;
if (oversampling_setting == 3) b3 = ((int32_t) ac1 * 4 + x3 + 2) << 1;
if (oversampling_setting == 2) b3 = ((int32_t) ac1 * 4 + x3 + 2);
if (oversampling_setting == 1) b3 = ((int32_t) ac1 * 4 + x3 + 2) >> 1;
if (oversampling_setting == 0) b3 = ((int32_t) ac1 * 4 + x3 + 2) >> 2;
x1 = ac3 * b6 >> 13;
x2 = (b1 * (b6 * b6 >> 12)) >> 16;
x3 = ((x1 + x2) + 2) >> 2;
b4 = (ac4 * (uint32_t) (x3 + 32768)) >> 15;
b7 = ((uint32_t) up - b3) * (50000 >> oversampling_setting);
p = b7 < 0x80000000 ? (b7 * 2) / b4 : (b7 / b4) * 2;
x1 = (p >> 8) * (p >> 8);
x1 = (x1 * 3038) >> 16;
x2 = (-7357 * p) >> 16;
*pressure = p + ((x1 + x2 + 3791) >> 4);
}
unsigned int bmp085_read_ut() {
write_register(0xf4,0x2e);
delay(5); //longer than 4.5 ms
return read_int_register(0xf6);
}
void bmp085_get_cal_data() {
//Serial.println("Reading Calibration Data");
ac1 = read_int_register(0xAA);
//Serial.print("AC1: ");
//Serial.println(ac1,DEC);
ac2 = read_int_register(0xAC);
//Serial.print("AC2: ");
//Serial.println(ac2,DEC);
ac3 = read_int_register(0xAE);
//Serial.print("AC3: ");
//Serial.println(ac3,DEC);
ac4 = read_int_register(0xB0);
//Serial.print("AC4: ");
//Serial.println(ac4,DEC);
ac5 = read_int_register(0xB2);
//Serial.print("AC5: ");
//Serial.println(ac5,DEC);
ac6 = read_int_register(0xB4);
//Serial.print("AC6: ");
//Serial.println(ac6,DEC);
b1 = read_int_register(0xB6);
//Serial.print("B1: ");
//Serial.println(b1,DEC);
b2 = read_int_register(0xB8);
//Serial.print("B2: ");
//Serial.println(b1,DEC);
mb = read_int_register(0xBA);
//Serial.print("MB: ");
//Serial.println(mb,DEC);
mc = read_int_register(0xBC);
//Serial.print("MC: ");
//Serial.println(mc,DEC);
md = read_int_register(0xBE);
//Serial.print("MD: ");
//Serial.println(md,DEC);
}
long bmp085_read_up() {
write_register(0xf4,0x34+(oversampling_setting<<6));
delay(pressure_waittime[oversampling_setting]);
unsigned char msb, lsb, xlsb;
Wire.beginTransmission(I2C_ADDRESS);
Wire.send(0xf6); // register to read
Wire.endTransmission();
Wire.requestFrom(I2C_ADDRESS, 3); // read a byte
while(!Wire.available()) {
// waiting
}
msb = Wire.receive();
while(!Wire.available()) {
// waiting
}
lsb |= Wire.receive();
while(!Wire.available()) {
// waiting
}
xlsb |= Wire.receive();
return (((long)msb<<16) | ((long)lsb<<8) | ((long)xlsb)) >>(8-oversampling_setting);
}
void write_register(unsigned char r, unsigned char v)
{
Wire.beginTransmission(I2C_ADDRESS);
Wire.send(r);
Wire.send(v);
Wire.endTransmission();
}
char read_register(unsigned char r)
{
unsigned char v;
Wire.beginTransmission(I2C_ADDRESS);
Wire.send(r); // register to read
Wire.endTransmission();
Wire.requestFrom(I2C_ADDRESS, 1); // read a byte
while(!Wire.available()) {
// waiting
}
v = Wire.receive();
return v;
}
int read_int_register(unsigned char r)
{
unsigned char msb, lsb;
Wire.beginTransmission(I2C_ADDRESS);
Wire.send(r); // register to read
Wire.endTransmission();
Wire.requestFrom(I2C_ADDRESS, 2); // read a byte
while(!Wire.available()) {
// waiting
}
msb = Wire.receive();
while(!Wire.available()) {
// waiting
}
lsb = Wire.receive();
return (((int)msb<<8) | ((int)lsb));
}
void resetSHT()
{
pinMode(PIN_SDA, OUTPUT);
pinMode(PIN_SCL, OUTPUT);
shiftOut(PIN_SDA, PIN_SCL, LSBFIRST, 255);
shiftOut(PIN_SDA, PIN_SCL, LSBFIRST, 255);
digitalWrite(PIN_SDA, HIGH);
for(int i = 0; i < 15; i++) {
digitalWrite(PIN_SCL, LOW);
digitalWrite(PIN_SCL, HIGH);
}
}
//Specific SHT start command
void startSHT()
{
pinMode(PIN_SCL, OUTPUT);
pinMode(PIN_SDA, OUTPUT);
digitalWrite(PIN_SDA, HIGH);
digitalWrite(PIN_SCL, HIGH);
digitalWrite(PIN_SDA, LOW);
digitalWrite(PIN_SCL, LOW);
digitalWrite(PIN_SCL, HIGH);
digitalWrite(PIN_SDA, HIGH);
digitalWrite(PIN_SCL, LOW);
}
void writeByteSHT(byte data)
{
pinMode(PIN_SCL, OUTPUT);
pinMode(PIN_SDA, OUTPUT);
// digitalWrite(PIN_SDA,LOW);
shiftOut(PIN_SDA,PIN_SCL, MSBFIRST, data);
pinMode(PIN_SDA, INPUT);
//Wait for SHT15 to acknowledge by pulling line low
while(digitalRead(PIN_SDA) == 1);
digitalWrite(PIN_SCL, HIGH);
digitalWrite(PIN_SCL, LOW); //Falling edge of 9th clock
//wait for SHT to release line
while(digitalRead(PIN_SDA) == 0 );
//wait for SHT to pull data line low to signal measurement completion
//This can take up to 210ms for 14 bit measurments
int i = 0;
while(digitalRead(PIN_SDA) == 1 ) {
i += 10;
if (i >= 1000) break;
delay(10);
}
//debug
//Serial.print("Response time = ");
//Serial.println(i);
}
//Read 16 bits from the SHT sensor
int readByte16SHT()
{
int cwt = 0;
pinMode(PIN_SDA, INPUT);
pinMode(PIN_SCL, OUTPUT);
digitalWrite(PIN_SCL, LOW);
for(int i = 0; i < 17; i++) {
if(i != 8) {
digitalWrite(PIN_SCL, HIGH);
cwt = cwt << 1 | digitalRead(PIN_SDA);
digitalWrite(PIN_SCL, LOW);
}
else {
pinMode(PIN_SDA, OUTPUT);
digitalWrite(PIN_SDA, LOW);
digitalWrite(PIN_SCL, HIGH);
digitalWrite(PIN_SCL, LOW);
pinMode(PIN_SDA, INPUT);
}
}
//leave clock high??
digitalWrite(PIN_SCL, HIGH);
//Serial.println();
return cwt;
}
int getTempSHT()
{
startSHT();
writeByteSHT(B0000011);
return readByte16SHT();
}
int getHumidSHT()
{
startSHT();
writeByteSHT(B00000101);
return readByte16SHT();
}
void setup()
{
Serial.begin(9600); // start serial for output
//Serial.println("Setting up BMP085");
pinMode(PIN_SDA, OUTPUT);
pinMode(PIN_SCL, OUTPUT);
Wire.begin();
bmp085_get_cal_data();
resetSHT();
delay(2000);
}
void loop()
{
int temperature = 0;
long pressure = 0;
bmp085_read_temperature_and_pressure(&temperature,&pressure);
float val;
val = (float)getTempSHT();
float tempC = -40.0 + 0.01 * val;
val = (float)getHumidSHT();
float humid = -4.0 + 0.0405 * val + -0.0000028 * val * val;
// http://en.wikipedia.org/wiki/Dew_point
float a = 17.271;
float b = 237.7;
float gamma = log(humid / 100) + a / (b / tempC + 1);
float dewPoint = b / (a / gamma - 1);
selectLineOne();
Serial.print(tempC ,1);
Serial.print((char)223);
Serial.print("C");
Serial.print(" ");
//Serial.print(temperature / 10, DEC);
//Serial.print(".");
//Serial.print(temperature % 10, DEC);
//Serial.print(",");
Serial.print(humid ,1);
Serial.print(" %");
selectLineTwo();
Serial.print(dewPoint ,1);
Serial.print((char)223);
Serial.print("C ");
Serial.print(pressure /100);
Serial.print(" hPa");
delay(5000);
}
void selectLineOne(){ //puts the cursor at line 0 char 0.
Serial.print(0xFE, BYTE); //command flag
Serial.print(128, BYTE); //position
delay(10);
}
void selectLineTwo(){ //puts the cursor at line 0 char 0.
Serial.print(0xFE, BYTE); //command flag
Serial.print(192, BYTE); //position
delay(10);
}
