AS7263 NIR sensor I2C ERROR

Sensors Distance
1

Hi,

I assembled the AS726X to a Qwiic and a redboard. Based on the hookup tutorial. However, when I tried to run the AS726X example code, it displays ‘I2C ERROR’ in the serial monitor.

Then I use codes to scan I2C, it returns no connection. But if I tightly push the AS726X to the Qwiic, the scanner shows its port is at 0x49. But if I leave it there, the connection failed again.

Is there any way to solve the issue? I bought two wires, none of them works.

Thanks,

Yang

2

Are you using the AS7265x found on this [board?

Or is there a different product SKU that you’re using in the AS726 family?](SparkFun Triad Spectroscopy Sensor - AS7265x (Qwiic) - SEN-15050 - SparkFun Electronics)

3

Hi,

I bought the red board(DEV-13975), Qwiic shield board(DEV-14352), the AS7263 NIR sensor(SEN-14351), two Qwiic cables(PRT-14427), and the USB cable to assemble all of them based on the tutorial. However, when I run the NIR sensor example code, it returns ‘I2C Error’. I used Wire.beginTranssmission(1~127), and Wire.endTransmission() to scan the devices, it returns NACK on transmit address.

Any suggestions? Do they have connection issues?

Thanks,

Yang

4

My NIR sensor is AS7263(SEN-14351), which is bought from SparkFun.

5

Can you please verify if you’ve tried using the code below at all?

#include "AS726X.h"

AS726X sensor;

void setup() -{
  sensor.begin();
}

void loop() -{
  sensor.takeMeasurements();
  sensor.printMeasurements();
}

*NOTE: before compiling the above code, remove the (-)'s infront of the {. This was done becasue we have a small bug concerning this character.

6

There is no printMeasurements() in the library. And the takeMeasurements() does not return any thing.

7

My apologies. Can you tell me which of the example codes from the [hookup guide that you are using?](https://learn.sparkfun.com/tutorials/as726x-nirvi?_ga=2.211882385.407553103.1582559371-2114068872.1578439588)

8

I combined the codes of I2C scanner and example 1. Once the scanner found the device, it will perform the sensor.takeMeasurementWithBulb(). The codes work when I slightly move the connection pins between the shield and the red-board. But if I leave them there, the connection seems lost. So I think that caused by the hardware connection between the shield and the red-board.

I have some Serial terminal prints:

15:37:34.285 → Scanning…

15:37:34.285 → No I2C devices found

15:37:34.318 →

15:37:34.790 → Scanning…

15:37:34.823 → No I2C devices found

15:37:34.823 →

15:37:35.323 → Scanning…

15:37:35.323 → No I2C devices found

15:37:35.357 →

15:37:35.823 → Scanning…

15:37:35.823 → No I2C devices found

15:37:35.861 →

15:37:36.365 → Scanning…

15:37:36.365 → No I2C devices found

15:37:36.404 →

15:37:36.860 → Scanning…

15:37:36.894 → No I2C devices found

15:37:36.894 →

15:37:37.386 → Scanning…

15:37:37.386 → No I2C devices found

15:37:37.423 →

15:37:37.873 → Scanning…

15:37:37.910 → No I2C devices found

15:37:37.948 →

15:37:38.430 → Scanning…

15:37:38.430 → I2C device found at address 0x49 !

15:37:38.837 → Reading: R[16059.89] S[5897.50] T[1354.40] U[800.81] V[917.49] W[593.11] tempF[77.0]

15:37:39.038 → done

9

And I also want to ask what those number means. Are they wavelength?

Reading: R[16059.89] S[5897.50] T[1354.40] U[800.81] V[917.49] W[593.11] tempF[77.0]

I just know the temp is the temperature.

Thanks,

Yang

10

I would definitely check those shield connections, but the code and sensor seem to work.

Those values can be found in the [Datasheet on page 11. They do appear to be different wavelengths and the units are counts/(uW/cm^2).](https://cdn.sparkfun.com/assets/learn_tutorials/1/4/3/AS7263_Datasheet.pdf)

11

Yes, the codes definitely work.

I’m wondering if there any ways I can convert the NIR sensor output counts/(uW/cm^2) to wavelength (nm)?

12

Those channels are specific to certain wavelengths. You could state in your print statements the wavelength and calculate a confidence value or intensity count to show which wavelengths are most prevalent.

13

Is there any materials I can look into for how to compute the confidence value or intensity count?

14

Unfortunately, we don’t have anything available on our end.