Subir datos dun sensor THPL a Plotly

Isto vai ser un pequeno resumo de como subir datos dunha estación con sensores de temperatura, humidade, presión e luminosidade a plotly. Con isto podes facer unha gráfica coma esta: https://plot.ly/~procastino/5

Preparación:

O primeiro que tes que ter montada a túa estación de sensores, a nosa leva os seguintes compoñentes:

Cando teñas todo na mesa, a estación se configura segundo o seguinte esquema:

(Clica para ampliar)

Tamén tes que rexistrate en plotly e obter un nome de usuario e unha API Key, non é complicado, pero por se te lías tes este titorial sobre como facelo.

Librerías e código:

Para que o programa funcione, vas ter que descargar un par de librerías, a DHT para poder empregar o sensor de humidade e a de plotly para poder comunicarte cos seus servidores, aquí tes as descargas:

- Librería DHT

- Librería plotly_ethernet

Cando teñas descargadas esas librerías, terás que descomprimir e colocar os dous cartafois na ubicación correspondente segundo o sistema operativo que empregues. Aquí che explican un pouco mellor o proceso.

Se xa tes as librerías instaladas, a montaxe feita e estás enchufado a internet, xa só tes que cargarlle este código tan longo e poderás comezar a ver os teus datos online. Atento aos comentarios en maiúsculas que che indican que partes do código debes cambiar, e algúns dos parámetros importantes do programa.

//collemos as librerías precisas

#include <plotly_ethernet.h>

#include <Wire.h>

#include <dht.h>

#include <SPI.h>

#include <Ethernet.h>

dht DHT;

plotly plotly; // initialize a plotly object, named plotly

int LDR=A3;

int pr;

#define DHT22_PIN 6

#define BMP085_ADDRESS 0x77 // I2C address of BMP085

const unsigned char OSS = 0; // Oversampling Setting NON SEI QUE FAI ISTO

// Calibration values

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;

// b5 is calculated in bmp085GetTemperature(...), this variable is also used in bmp085GetPressure(...)

// so ...Temperature(...) must be called before ...Pressure(...).

long b5;

//initialize plotly global variables

char layout[]="{}";

char filename[] = "Sensor THPL Casa"; // NOME DO ARQUIVO DE PLOTLY. SE NON O CAMBIAMOS VAI ENGADINDO DATOS NOVOS NESTE ARQUIVO

// Ethernet Setup

byte mac[] = { 0xDE, 0xAD, 0xBE, 0xEF, 0xFE, 0xED }; //NON IMPORTA

byte my_ip[] = { 199, 168, 222, 18 }; // google will tell you: "public ip address"

void startEthernet(){

Serial.println("Initializing ethernet");

if(Ethernet.begin(mac) == 0){

Serial.println("Failed to configure Ethernet using DHCP");

// no point in carrying on, so do nothing forevermore:

// try to congifure using IP address instead of DHCP:

Ethernet.begin(mac, my_ip);

}

Serial.println("Done initializing ethernet");

delay(1000);

}

void setup()

{

Serial.begin(9600);

Wire.begin();

bmp085Calibration();

pinMode(LDR, INPUT);

startEthernet(); // initialize ethernet

// Initialize plotly settings

plotly.VERBOSE = true; // turn to false to suppress printing over serial

plotly.DRY_RUN = false; // turn to false when you want to connect to plotly's servers

plotly.username = "xxxxxxx"; // NOME DE USUARIO DE PLOTLY

plotly.api_key = "yyyyyy"; // API KEY DE PLOTLY

plotly.timestamp = true; // tell plotly that you're stamping your data with a millisecond counter and that you want plotly to convert it into a date-formatted graph

plotly.timezone = "Europe/Madrid"; // full list of timezones is here:

}

void loop()

{

//LEctura de luz

int luz=analogRead(LDR);

int l=map(luz,0,1023,0,100);

//Lectura de humidade e temperatura

int chk=DHT.read22(DHT22_PIN);

float t=DHT.temperature;

float h=DHT.humidity;

//lectura de presion

bmp085GetTemperature(bmp085ReadUT());//chamo a lectura de temperatura, formalismo

//meto este delay por se acaso da problemas a lectura

delay(2000);

pr = (bmp085GetPressure(bmp085ReadUP())/100)-900;

pr =(int) pr;

Serial.println("presion\t");

Serial.println(pr);

Serial.println("luminosidade\t");

Serial.println(l);

// Open the Stream

plotly.open_stream(1, 4, filename, layout); // plotlystream(number_of_points, number_of_traces, filename, layout)

plotly.post(millis(),pr);

delay(150);

plotly.post(millis(),t);

delay(150);

plotly.post(millis(),h);

delay(150);

plotly.post(millis(),l); // post luminosity to plotly (trace 4)

for(int i=0; i<1800; i++){ //NUMERO DE SEGUNDOS QUE AGARDAMOS ENTRE DATO E DATO (1800=MEDIA HORA)

delay(1000);

}

}

// Stores all of the bmp085's calibration values into global variables

// Calibration values are required to calculate temp and pressure

// This function should be called at the beginning of the program

void bmp085Calibration()

{

ac1 = bmp085ReadInt(0xAA);

ac2 = bmp085ReadInt(0xAC);

ac3 = bmp085ReadInt(0xAE);

ac4 = bmp085ReadInt(0xB0);

ac5 = bmp085ReadInt(0xB2);

ac6 = bmp085ReadInt(0xB4);

b1 = bmp085ReadInt(0xB6);

b2 = bmp085ReadInt(0xB8);

mb = bmp085ReadInt(0xBA);

mc = bmp085ReadInt(0xBC);

md = bmp085ReadInt(0xBE);

}

// Read 2 bytes from the BMP085

// First byte will be from 'address'

// Second byte will be from 'address'+1

int bmp085ReadInt(unsigned char address)

{

unsigned char msb, lsb;

Wire.beginTransmission(BMP085_ADDRESS);

Wire.write(address);

Wire.endTransmission();

Wire.requestFrom(BMP085_ADDRESS, 2);

while(Wire.available()<2)

;

msb = Wire.read();

lsb = Wire.read();

return (int) msb<<8 | lsb;

}

// Calculate temperature given ut.

// Value returned will be in units of 0.1 deg C

short bmp085GetTemperature(unsigned int ut)

{

long x1, x2;

x1 = (((long)ut - (long)ac6)*(long)ac5) >> 15;

x2 = ((long)mc << 11)/(x1 + md);

b5 = x1 + x2;

return ((b5 + 8)>>4);

}

// Read the uncompensated temperature value

unsigned int bmp085ReadUT()

{

unsigned int ut;

// Write 0x2E into Register 0xF4

// This requests a temperature reading

Wire.beginTransmission(BMP085_ADDRESS);

Wire.write(0xF4);

Wire.write(0x2E);

Wire.endTransmission();

// Wait at least 4.5ms

delay(5);

// Read two bytes from registers 0xF6 and 0xF7

ut = bmp085ReadInt(0xF6);

return ut;

}

// Read the uncompensated pressure value

unsigned long bmp085ReadUP()

{

unsigned char msb, lsb, xlsb;

unsigned long up = 0;

// Write 0x34+(OSS<<6) into register 0xF4

// Request a pressure reading w/ oversampling setting

Wire.beginTransmission(BMP085_ADDRESS);

Wire.write(0xF4);

Wire.write(0x34 + (OSS<<6));

Wire.endTransmission();

// Wait for conversion, delay time dependent on OSS

delay(2 + (3<<OSS));

// Read register 0xF6 (MSB), 0xF7 (LSB), and 0xF8 (XLSB)

Wire.beginTransmission(BMP085_ADDRESS);

Wire.write(0xF6);

Wire.endTransmission();

Wire.requestFrom(BMP085_ADDRESS, 3);

// Wait for data to become available

while(Wire.available() < 3)

;

msb = Wire.read();

lsb = Wire.read();

xlsb = Wire.read();

up = (((unsigned long) msb << 16) | ((unsigned long) lsb << 8) | (unsigned long) xlsb) >> (8-OSS);

return up;

}

// Calculate pressure given up

// calibration values must be known

// b5 is also required so bmp085GetTemperature(...) must be called first.

// Value returned will be pressure in units of Pa.

long bmp085GetPressure(unsigned long up)

{

long x1, x2, x3, b3, b6, p;

unsigned long b4, b7;

b6 = b5 - 4000;

// Calculate B3

x1 = (b2 * (b6 * b6)>>12)>>11;

x2 = (ac2 * b6)>>11;

x3 = x1 + x2;

b3 = (((((long)ac1)*4 + x3)<<OSS) + 2)>>2;

// Calculate B4

x1 = (ac3 * b6)>>13;

x2 = (b1 * ((b6 * b6)>>12))>>16;

x3 = ((x1 + x2) + 2)>>2;

b4 = (ac4 * (unsigned long)(x3 + 32768))>>15;

b7 = ((unsigned long)(up - b3) * (50000>>OSS));

if (b7 < 0x80000000)

p = (b7<<1)/b4;

else

p = (b7/b4)<<1;

x1 = (p>>8) * (p>>8);

x1 = (x1 * 3038)>>16;

x2 = (-7357 * p)>>16;

p += (x1 + x2 + 3791)>>4;

return p;

}

Os teus datos en plotly:

Se todo foi ben, xa deberas ter os teus datos na web, e deberan aparecer nun ficheiriño que podes abrir desde a páxina principal, estando logueado/a. Desde plotly podes configurar moi ben a apariencia das gráficas, así como recuperar en calquera momento o histórico de datos da túa estación, o cal é moi interesante para estudar o clima do teu colexio.