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    Tuesday, January 27, 2015

    Using the BusPirate to see if it's Alive- TI HDC1000

    I2C Testing with the Buspirate

    This mini article is part of a larger project an I will link to it at the end. For this project, I was required to use the TI HDC1000 and instead of buying a module, I decided to get samples and a make a PCB of my own. This would be great except I had to create the footprints which are almost microscopic! Anyways I got it made from SeeedStudios and I bought one of those ultra cheap hot air stations with no indications about temperature or airflow and some paste and got started. The reflow happened painlessly and I was pretty happy with myself. Before I move on to mounting any other parts, I decided to see if the HDC1000 was alive or had kicked the bucked in my hotair experiment.

    So I started with soldering the header as well as power test pins and I hooked up the BusPirate. Har har har! I think I can explain the rest via a video and so...

    Reading the Temperature and Humidity

    In order to read temperature and humidity, there is a set of commands you have fire at it. You should go through the datasheet but I am going to give you the quick and dirty on reading the temperature & RH.
    The first thing to do it configure the HDC1000 to take measurements. It is usually in deep-sleep so I need to wake it up and configure it. So I have to send...

    [0x86 0x02 0x1e 0x00]

    Why I send that? Well the 0x86 is the address of the HDC1000 with write bit and 0x02 is the configuration register address. 0x1e & 0x00 is the configuration to write.

    Next we Trigger the reading by

    [0x96 0x00

    Note that there is no ] at the end which means that I do not send a stop character. Next I send...

    [0x87 rrrr]

    Which sends another start of frame and the read address of the HDC1000. We read 4 bytes which are MSB then LSB for the Temperature and Humidity.

    Using the BusPirate to get T & RH 
    Using the BusPirate to get T & RH

    I am getting the temperature but the humidity still boggles me and I think I may have burned it out. I will post more once I test another HDC1000 or someone helps me ;)

    Till then,

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