Spectrometer logger with triad spectro AS7265x

Sensors Imaging
1

Hi,

I’m working on an outreach project and would like to have a device which will register with time the values from the AS7265x sensors.

I’ve assembled this [wishlist and would like to know whether this will allow me to :

  • write every XX seconds the values from all the chanels from the AS7265x sensors to an SD card

  • have the device to be nomad with a battery (is this one in the wishlist ok ?)

  • In the midterm I would also like to register the magnetic field value with the MLX90393. Is it possible/easy to have the logger read the imaging + magnetic field values and write to the same file ?

I’m not and Arduino expert but I have some decent physics and coding background.

Any advice on my shopping list (do I forget something) will be greatly appreciated.

Thanks](logging spectrometer - SparkFun Electronics)

2

Hi aktro,

Everything in that wishlist will work together but, unless you already have a logging board, you’re going to need something to log the data to an SD card. I would recommend using either of our OpenLog boards:

  • - [[SparkFun OpenLog](https://www.sparkfun.com/products/13712)
  • - [[SparkFun Qwiic OpenLog](https://www.sparkfun.com/products/15164)
    • [/list]

    Both OpenLogs function very similarly. The primary difference is the standard OpenLog receives serial data from a device and logs it where the Qwiic OpenLog connects over I2C. I hope this helps you find the right parts for your project. Also, if you are not familiar with Arduino, I would highly recommend reading through the various Hookup Guides we have put together for all the SparkFun boards in your Wishlist.](https://www.sparkfun.com/products/15164)](SparkFun OpenLog - DEV-13712 - SparkFun Electronics)

    3

    Obviously this was missing in the wish list but luckily I added it to my order.

    Thanks for the reply.

    Looking forward to play with this Triad.

    4

    Can you help us with the SparkFun Triad Spectroscopy Sensor - AS7265x (Qwiic)? It has been interfaced with RPI. We are obtaining graphs from the sensor but are unsure what the quantities are. On the x-axis, we are getting time, but on the y-axis, we don’t have any idea what we are getting. The wavelengths keep fluctuating with the 12 wavelengths, but we are not sure what the value on the y axis is. Can you help us with it?

    5

    The raw counts at each wavelength are approximately proportional to the light intensity at that wavelength. The AS7265 data sheet gives the conversion factors in counts per microWatts/cm^2.

    6

    So, we obtain the readings in the form of graphs right. However, how do you use the graphs for performing the sample analysis? Is it possible to analyze the soil chemical makeup or any sample’s elemental composition with the readings we obtain from these graphs?

    7

    The readings are light intensities in the wavelength channels. In some very simple cases it would be possible to relate the sensor data to elemental composition.

    To start your research, the general topics are absorption and emission spectroscopy, which are very broad and complex.

    8

    aktro:
    Hi,

    I’m working on an outreach project and would like to have a device which will register with time the values from the AS7265x sensors.

    I’ve assembled this [wishlist and would like to know whether this will allow me to :

    • write every XX seconds the values from all the chanels from the AS7265x sensors to an SD card

    • have the device to be nomad with a battery (is this one in the wishlist ok ?)

    • In the midterm I would also like to register the magnetic field value with the MLX90393. Is it possible/easy to have the logger read the imaging + magnetic field values and write to the same file ?

    I’m not and Arduino expert but I have some decent physics and coding background.

    Any advice on my shopping list (do I forget something) will be greatly appreciated.

    Thanks
    [/quote]

    i did something similar:

    i use a esp32 (arduino nano board does not have enough computacional power) a a microSD adapter and a RGB sensor

    every time the sensor reads (button push) a txt with all the info is logged into the SD card

    i use a nextion screen to show graphs and data

    and a external usb brick to power it up without the need of power management

    my only to-do´s are: dark calibration and time of reading/gain adjustment](logging spectrometer - SparkFun Electronics)