I have zero programming skills and would need some help. I need to measure the irradiance in mW/cm² of a 254nm-UVC-light-source.
I have an Arduino Uno at home and recently bought this UVC-sensor. Now, it seems Mikroelektronika does not provide code/libraries for Arduino. I would expect it to be fairly easy to make the sensor work with an Arduino Uno - but I have not the slightest clue how to do this.
In case this is a 5min-job: Would any good Samaritan write me the code I need to compile?
I assume all the necessary information is provided in the link I mentioned above.
The same basic sensor can be purchased from Adafruit, and comes with a library and application examples for Arduino. Beware: many of the look-alike sensors on eBay and Aliexpress are not compatible with the Adafruit library.
Light intensity is converted in digital value by using MCP3221 a successive approximation A/D converter (ADC) with a 12-bit resolution.
Output responsivity of 0.6mV/nW (at 254nm)
Interface : Analog, I2C
and if you looked up MCP3221 there is actually an arduino library with examples for it!
so in summary, either
use the MCP3221 library to get started (if you're not sure of the board's I2C addr you can always find that out using an I2C scanner)
or
use the analog output from the board directly to you arduino analog input (bear in mind that the uno ADC resolution is 10 bit)
whatever you choose, once you have the ADC readout, you can then do the conversion to determine the corresponding the light intensity
I was connecting all pins mentioned on the website (except the AN-pin) to my arduino, uploaded one of the MCP3221-library-examples and was getting reasonable voltage-readings.
Just two little questions: Is it correct to use all indicated pins except the AN-pin? And should I just ignore the VCC-SEL-thing?
IMHO the only board/arbuino connections for I2C communication would be
12
SCL
I2C Clock
11
SDA
I2C Data
10
5V
Power Supply
7
3.3V
Power Supply
9
GND
Ground
According to the board's schematic, only matters if you want to use 5V for the I2C pullup resistors (in which case the would be not need to connect pin 7 on the board).
