AS7265x – Only Blue LED Blinking, No Data (2 Units)

Sensors
1

Hello,

I purchased 5 units of the SparkFun AS7265x Spectral Triad sensor through Evelta Electronics (India).

Out of these, 2 sensors are not functioning correctly.

Issue observed:

  • Only continuous blue LED blinking

  • No data output over I2C

Setup:

  • ESP32 (I2C communication)

  • Same wiring and code used for all sensors

Troubleshooting:

  • Verified wiring multiple times

  • Restarted ESP32

  • Tested sensors individually

  • Issue persists consistently on these two units

Earlier, other units worked correctly under the same setup.

I have attached a video demonstrating the issue.

Kindly confirm whether this behavior indicates a hardware fault.

Thank you.

video: https://drive.google.com/file/d/1kR-o5p0fJeF5PAyh_rCTzFbG1IJHd2wp/view?usp=sharing

2

Based on the video I’m guessing the soldering here

image
image153×216 43.6 KB

is the issue. Test those points for shorts/improper continuity and/or give them a quick fixing/touch-up

3

The main issue concerns the unattached sensors. The sensor highlighted in the picture is a working prototype, shown solely to demonstrate the functionality of an actual, operational sensor compared to the two other sensors. In the two AS7265X, which are not connected to any source, only the blue LED is blinking when connected to a microcontroller, but we also need the white LED along the side to blink, just as it does in the fully assembled sensor.

4

When switching sensors it is necessary to remove power from your microcontroller then reapply power so the code restarts. Otherwise the new sensor will not initialize.
Also, you appear to have more than one sensor conneted to your controller at a time. This will cause an I2C address conflict.

5

Please share photos of the non-working units when you get a chance, particularly the soldering