Honeywell air flow sensor Data reading analysis issue

Thread Starter

nirmit27

Joined Mar 5, 2018
6
hi
Please help me out for Honeywell Airflow sensor for reading proper date with appropriate Flow value.
i am getting some data which in increasing by blowing sensor means if air is passing air flow value is increasing
but i am unable to measure actual flow rate. i am not able to read proper sequence given in data sheet of sensor....how many byte of data to read...how many bit to discard and when to start reading.
i want help in reading proper data for airflow but am not getting what exactly datasheet explained in it.
i am attaching datasheet snapshot and full datasheet too
https://sensing.honeywell.com/honeywell-sensing-i2c-communications-digital-airflow-sensors-technical-note-008210-5-en.pdf

https://sensing.honeywell.com/honeywell-sensing-zephyr-digital-airflow-10-slpm-300-slpm-datasheet-008268-5-en.pdf

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Thank YOu
 
But, without including your code and what controller you are using and all the details, you are literally asking someone to write the program for you and to do it blindly. You will have a better chance of success if you include all the details - especially your program.

Failing that, I would direct you to the technical note linked below and different than the one you linked:
https://www.digikey.com/Web Export/Supplier Content/HoneywellSC_480/PDF/Honeywell_Technical_I2C.pdf?redirected=1

Particularly the information in section 4.0, Calculation of flow from digital output - including the formula listed there.

Hope that helps.
 

Thread Starter

nirmit27

Joined Mar 5, 2018
6
But, without including your code and what controller you are using and all the details, you are literally asking someone to write the program for you and to do it blindly. You will have a better chance of success if you include all the details - especially your program.

Failing that, I would direct you to the technical note linked below and different than the one you linked:
https://www.digikey.com/Web Export/Supplier Content/HoneywellSC_480/PDF/Honeywell_Technical_I2C.pdf?redirected=1

Particularly the information in section 4.0, Calculation of flow from digital output - including the formula listed there.

Hope that helps.
i am using PIC controller, pic to sensor hardware commutation is I2C communication
using I2C communication i am getting data too, which is increasing if i blow to sensor read data value is increasing,
in this my doubt is i am not able to read with proper sequence given in datasheet..i am not getting words given in datasheet.
so help me out to read proper flow rate
 
i am using PIC controller, pic to sensor hardware commutation is I2C communication
using I2C communication i am getting data too, which is increasing if i blow to sensor read data value is increasing,
in this my doubt is i am not able to read with proper sequence given in datasheet..i am not getting words given in datasheet.
so help me out to read proper flow rate
I can not see which PIC chip you are using, which flow sensor (the data sheet gives several and with different I2C addresses), how it is interfaced, what the schematic looks like, what the code looks like, what results you are getting with and without blowing on the sensor and what values for flow rate that you are getting when you convert the data as per Equation 1 in the document that I linked in my first post.

Sorry I can't help and good luck with your problem.
 
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