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HDC1000 Reading sensor
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respected



Joined: 16 May 2006
Posts: 95

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PostPosted: Mon Jan 12, 2015 3:04 am     Reply with quote
In fact I know i2c needs pullups. But pullups are other side. Anyway this is good lesson for me
Animok



Joined: 03 May 2018
Posts: 11

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HDC1000 WORKING
PostPosted: Mon Feb 25, 2019 12:05 pm     Reply with quote
Hello everyone!
I got many solutions from this forum, so I would like contribute with my solution about HDC1000 sensor.
I read temperature and humidity separately. Here you are the routines:
Code:

#use i2c(Master,SLOW,sda=PIN_B5,scl=PIN_B4,force_hw)
//------
void hdc_setup(void)
{
    i2c_start();     
   i2c_write(0x02);                         
    i2c_write(0x20);   //
    i2c_write(0x00);
    i2c_stop();
   delay_ms(500);                         
}                                                 
//********************************************************                                                         
void read_T(void)                                       
{
   i2c_start();
    i2c_write(0x80);             
    i2c_write(0x00);
    delay_ms(300);       //that's the key!!
    i2c_write(0x81);
    data[0]=i2c_read();
    data[1]=i2c_read(0);
   i2c_stop();   
   variaL=make16(data[0],data[1]);   
    temperature=(variaL*0.0025177)-40;
    delay_ms(500);   
}                   
//*********************************************************
void read_HR(void)                                       
{
   i2c_start();
    i2c_write(0x80);             
    i2c_write(0x01);
    delay_ms(300);       //that's the key!!
    i2c_write(0x81);
    data[0]=i2c_read();
    data[1]=i2c_read(0);
   i2c_stop();   
   variaL=make16(data[0],data[1]);   
    humidity=(variaL*0.0015258);
    delay_ms(500);   
}       

This is for all good people in the world! Cool
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