AS7262 Sensor Power Issue – LED Turns Off Shortly After Power-On (I2C with ESP32)

Sensors
1

Subject: AS7262 Spectral Sensor Issue – Potential Hardware Problem

Hello SparkFun Community,

I am experiencing an issue with the AS7262 Spectral Sensor connected to my ESP32 via I2C. When powered on, the sensor’s LED lights up briefly for about two seconds before turning off completely. This happens consistently each time I connect the sensor.

To troubleshoot, I have:

  1. Verified the sensor is receiving a stable 3.3V supply from an external regulator.
  2. Tried various high-quality USB cables and reliable 5V/1A sources to power the ESP32.
  3. Ensured correct wiring, including a common ground with the ESP32, and confirmed I2C connections.

Despite these efforts, the sensor does not stay powered on, which leads me to suspect a potential hardware issue. Has anyone experienced similar issues with the AS7262, or does anyone have recommendations for further troubleshooting? I would also like to know if this could indicate a faulty product.

Thank you in advance for any assistance!

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What esp32 are you using?

Share photos of your wiring/setup

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Thank you for your response. I’m currently using the ESP32 Wrover module with the AS7262 Spectral Sensor connected via I2C. The wiring setup is as follows:

  • VCC on the AS7262 is connected to a stable 3.3V supply.
  • GND is connected to a common ground shared with the ESP32.
  • SCL and SDA from the sensor are connected to the corresponding I2C pins on the ESP32.

I’ve double-checked all connections, and I’ve tried multiple ESP32 modules, power sources, and even stable external 3.3V supplies, but the sensor continues to turn off shortly after powering up.

Photos of my wiring and setup are attached to this message for further reference. Any insights on whether this might indicate a faulty sensor would be greatly appreciated.

Thank you again for your assistance!

Image 1
Image 11600×1201 278 KB

4

Sorry, I’m able to attach only one photo here but will provide additional video through a drive link.

5

99% chance it’s the wiring…get rid of all those junctions and use 1 wire to/from each pin…either soldered or at least using connectors, so they don’t move all willy-nilly and short on one another and re-try

6

Thank you for the suggestion! That was actually my initial thought as well, so I tried everything you mentioned—different wires, minimal connections, securely soldered connections, and even used external DC power sources available at my university’s electronics lab. Unfortunately, the same issue persists: the sensor still doesn’t stay powered on.

Given these attempts, could this potentially be a hardware issue with the sensor itself? Any further guidance would be appreciated.