kriswiner / as7265x Goto Github PK

I run it on UNO
intpin -> Digital 3 ;
reset -> Reset

It runs on terminal and

Returns Scanning...
I2C device found at address 0x49 !
done

I2C scan done
AS72651 Device Type = 0x40 should be 0x40

AS72651 HW Version = 0x41 should be 0x41

AS72651 FW Major Version = 0xC
AS72651 FW Patch Version = 0x0
AS72651 FW Build Version = 0x0

any ideas ?

Hi Kris,
Do you still have by a chance one unpopulated PCB of the previous version i.e. PCB with the vertical sensor layout (as it is shown in your project Readme)? I checked at Tindie but they have only the new board with "triad" sensor arrangement.
My plan is to evaluate your spectrometer for transmission measurement with a cuvette samples and for that that vertical layout is more suitable.
regards
Jacek

Hey Kris,

thanks for your work, we have read a lot about your project and it was very inspiring to see your solution. Hope it is selling good on tindie!

We have an AS7265x spectrometer running, but we struggle with understanding the unit (& converting it). According to the datasheet, the unit is counts/(μW/cm2), but we cannot find more information on what counts are and how to convert it to a unit that represents light intensity.

We would love to be able to convert the counts/(μW/cm²) value to something like μmol * m⁻² * s⁻¹ which is used for light recipes for plants for example.

Do you know what the counts are and how to convert the measurements from the spectrometer in other units?

Thanks in advance!

I'm having a couple issues with your demo sketch, listed below.

• Line 38 is: Wire.begin(/*TWI_PINS_20_21*/); // set master mode, which fails compile time since TWI_PINS_20_21 is not defined. Furthermore, the arduino documentation specifies that adding an argument to Wire.begin() will join i2c as slave with the 7 bit address specified, which seems counterintuitive to what this code is doing. I managed to get it working using just 'Wire.begin(), which joins i2c as master.

• Line 79 is: (delay(100); where it should be delay(100);

• In your header file, you write:

`#define AS72651_CAL_CHAN0_0 0x14
#define AS72651_CAL_CHAN0_1 0x15
#define AS72651_CAL_CHAN0_2 0x16
#define AS72651_CAL_CHAN0_3 0x17

#define AS72651_CAL_CHAN1_0 0x18
#define AS72651_CAL_CHAN1_1 0x19
#define AS72651_CAL_CHAN1_2 0x1A
#define AS72651_CAL_CHAN1_3 0x1B

#define AS72651_CAL_CHAN2_0 0x1C
#define AS72651_CAL_CHAN2_1 0x1D
#define AS72651_CAL_CHAN2_2 0x1E
#define AS72651_CAL_CHAN2_3 0x1F

#define AS72651_CAL_CHAN3_0 0x20
#define AS72651_CAL_CHAN3_1 0x21
#define AS72651_CAL_CHAN3_2 0x22
#define AS72651_CAL_CHAN3_3 0x23

#define AS72651_CAL_CHAN4_0 0x24
#define AS72651_CAL_CHAN4_1 0x25
#define AS72651_CAL_CHAN4_2 0x26
#define AS72651_CAL_CHAN4_3 0x27

#define AS72651_CAL_CHAN4_0 0x28
#define AS72651_CAL_CHAN4_1 0x29
#define AS72651_CAL_CHAN4_2 0x2A
#define AS72651_CAL_CHAN4_3 0x2B
`
What is the purpose of redefining all of these values multiple times? Won't the final values be the last 4 lines?

• Finally, for some reason the void loop() function is not entered. I believe it is because the final AS7265X.getStatus() does not return. For example, this code
  Serial.print("attaching interrupt to myIntHandler()..."); attachInterrupt(intPin, myIntHandler, FALLING); Serial.println("done"); Serial.println("status:" + AS7265X.getStatus());
  returns attaching interrupt to myIntHandler()...done and nothing else.

Thanks for the help