LED flashing on SD Card IO using ESP32 webcam (AI-Thinker)

Q&A Forum › Category: ESP32 › LED flashing on SD Card IO using ESP32 webcam (AI-Thinker)

SDBURTON asked 3 years ago

I have run multiple sketches using the ESP32 webcam to log pictures to the SD Card. I notice that the LED for the camera lights up every time the SD Card is accessed. It seems on larger image writes to the SD card, the LED will flash multiple times. (multiple blocks possibly…?) I have noticed this on multiple boards and have tested using the RNT sketches with similar results. Is this a standard feature or do I have something crossed up somewhere? Thanks for any input or ideas!

3 Answers

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Sara Santos Staff answered 3 years ago

Hi.
That is a normal behavior of the ESP32-CAM AI Thinker.
The microSD card interface uses GPIO4. This GPIO is also connected to the LED flash light.
So, when you use the microSD card, it lights up the LED.
I’ve read that some people that don’t like that behavior, desolder the LED (I heven’t tried it yet).
Regards,
Sara

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SDBURTON answered 3 years ago

Thanks Sara! I really appreciate the level of detail and technical descriptions you and Rui provide in your examples and tutorials. I have learned so much about the ESP32, and continue to experiment and grow my knowledge on IOT programming.

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Sara Santos Staff answered 3 years ago

Thanks!
I’m really glad you’re enjoying and learning with our content.
All the best.
Regards,
Sara