How to get data from senor while using i2c protocol

Projects Programming
1

http://www.rainbowtechnology.cn/productinfo/1490.html
here is the link of the device

edit: so basically i want to know how to read data from sensor (5 parameters) in i2c bus and to convert it as mentioned below

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image802×603 21.9 KB

2

Have you tried the libraries for any of the devices that this is apparently an alternative for ?

3

No i haven't, i want to read data from scratch so i'm seeking help

4

1. The Sensor Module is given the 7-bit Slave Address: 1010001 (0x51)
2. Codes to check the presence of the Sesnor.

#include<Wire.h>
  #define sAddr 0x51
  Wire.beginTransmission(sAddr);
  byte busStatus = Wire.endTransmission();
  if (busStatus != 0)
  {
    Serial.print("Sensor is not found!");
    while (1); //wait for ever
  }
  Serial.println("Sensor is found.");

3. Codes to read 13-byte data from Sensor

byte m = Wire.requestFrom(sAddr, 13);
  for(int i = 0; i<m; i++)
  {
    myData[i] = Wire.read();
  }
  if(myData[0] != 0xFF)  //Message Header check
  {
    Serial.print("Invalid data received!");
    while(1);  //wait for ever
  }
  if(myData[3] != 0x00) //Status check
  {
    Serial.print("Data are in Error!");
    while(1);
  }
  Serial.println("Good data; proceed with processing.");

4. Extract Temperature signal and display.

unsigned myTemp = ((myData[4]<<8 | myData[5])-669)/10;
Serial.print(myTemp, DEC);
Serial.println("  degC");

5. EXtract other information......

5

the code is working fine but while converting data the values are wrong so can you help me get hex data bit by bit of 13 bits

6

Here are some changes i made in order to get proper readings please let me know if i'm missing something

#include<Wire.h>
#define Addr 0x51
void setup(){
  Wire.begin();
  Serial.begin(9600);
  Wire.beginTransmission(Addr);
  Wire.endTransmission();
}
void loop(){
Wire.beginTransmission(Addr);
  byte busStatus = Wire.endTransmission();
  if (busStatus != 0)
  {
    Serial.print("Sensor is not found!");
    while (1);
  }
  Serial.println("Sensor is found.");
  byte myData[13];
  byte m = Wire.requestFrom(0x51, 13);
  for(int i = 0; i<m; i++)
  {
    myData[i] = Wire.read();
  }
  for(int i = 0; i<m; i++)
  {
    Serial.print(myData[i],HEX);
    Serial.print(" ");
  }
  Serial.print("\n");
    if(myData[0] == 0xFF)  //Message Header check
  {
    Serial.println("Data received!");
  }
    if(myData[3] == 0x00) //Status check
  {
    Serial.println("Good data.");
  }
  else if(myData[3] == 0x01)
  {
  Serial.println("Sensor is heating!!");
  }
  else if(myData[3] == 0x02)
  {
  Serial.println("Error!");
  }
  uint16_t Co2 = word(myData[1], myData[2]);
  Serial.print(Co2, DEC);
  Serial.println(" ppm");
  uint16_t Temp = word(myData[4], myData[5]);
  Serial.print(float (Temp-669)/10);
  Serial.println(" °C");
  uint16_t Hum= word(myData[6], myData[7]);
  Serial.print((Hum-125)/10);
  Serial.println(" %RH");
  uint16_t TVOC= word(myData[8], myData[9]);
  Serial.print(TVOC,DEC);
  Serial.println(" ug/m3");
  uint16_t HCHO= word(myData[10], myData[11]);
  Serial.print(HCHO, DEC);
  Serial.println(" ug/m3");
  uint16_t sum=(myData[1]| myData[2]| myData[3]| myData[4]| myData[5]| myData[6]| myData[7]| myData[8]| myData[9]| myData[10]| myData[11]);
  Serial.print("Check code :");
  Serial.println(sum+1);
 delay(10000);
}
7

Please, use code tags (</>) for your sketch to appear as shown below.
To me, your sketch looks OK! I have just added one line (while(1);) and few inter-spaces.

#include<Wire.h>
#define Addr 0x51

void setup() 
{
  Wire.begin();
  Serial.begin(9600);
  Wire.beginTransmission(Addr);
  Wire.endTransmission();
}

void loop() 
{
  Wire.beginTransmission(Addr);
  byte busStatus = Wire.endTransmission();
  if (busStatus != 0)
  {
    Serial.print("Sensor is not found!");
    while (1);
  }
  Serial.println("Sensor is found.");

  byte myData[13];
  byte m = Wire.requestFrom(Addr, 13);
  for (int i = 0; i < m; i++)
  {
    myData[i] = Wire.read();
  }
  for (int i = 0; i < m; i++)
  {
    Serial.print(myData[i], HEX);
    Serial.print(" ");
  }
  Serial.print("\n");

  if (myData[0] == 0xFF) //Message Header check
  {
    Serial.println("Data received!");
  }

  if (myData[3] == 0x00) //Status check
  {
    Serial.println("Good data.");
  }
  else if (myData[3] == 0x01)
  {
    Serial.println("Sensor is heating!!");
  }
  else if (myData[3] == 0x02)
  {
    Serial.println("Error!");
    while(1);  //wait for ever.
  }

  uint16_t Co2 = word(myData[1], myData[2]);
  Serial.print(Co2, DEC);
  Serial.println(" ppm");

  uint16_t Temp = word(myData[4], myData[5]);
  Serial.print(float (Temp - 669) / 10);
  Serial.println(" °C");

  uint16_t Hum = word(myData[6], myData[7]);
  Serial.print((Hum - 125) / 10);
  Serial.println(" %RH");

  uint16_t TVOC = word(myData[8], myData[9]);
  Serial.print(TVOC, DEC);
  Serial.println(" ug/m3");

  uint16_t HCHO = word(myData[10], myData[11]);
  Serial.print(HCHO, DEC);
  Serial.println(" ug/m3");

  uint16_t sum = (myData[1] | myData[2] | myData[3] | myData[4] | myData[5] | 
  myData[6] | myData[7] | myData[8] | myData[9] | myData[10] | myData[11]);
  Serial.print("Check code :");
  Serial.println(sum + 1);

  delay(10000);
}
8

Changes to what ? You have not posted a previous version and to compound things you did not post the code in code tags

9

I have posted code tags now and the changes were made on the code which @GolamMostafa had sent earlier

10

I want this data to be sent in JSON format to cloud, can you help me with that

which includes status check and 5 parameters except Check code data

11

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