Troubleshooting • voltage on the GPIO pins without an SD card in the Raspberry Pi 5

Hi All,

I'm currently working with a photoelectric sensor connected to a Raspberry Pi using a DFrobot level shifter (12V to 3.3V). Recently, we have been facing an issue with the Raspberry Pi 5.

The sensor input voltage is 12V, and the sensor output voltage is also 12V. It is connected to a 2-channel Level Converter (12V to 3.3V). On the other side, 3.3V and GND from the Raspberry Pi are connected to the 2-Channel Level Converter, and the output terminal is connected to Raspberry Pi GPIO Pin 21 (PCM_DOut). This setup worked fine for a few days, but recently, I have been facing an issue where the Level Converter output is always high. I have measured 2.4VDC between GPIO Pin 21 and GND, both with and without the OS.

I tried pulling down the internal resistor by adding a line in the boot/firmware/config.txt file, but the issue still persists.

May I know the reason why this issue has occurred?

Level Convertor Link : https://www.dfrobot.com/product-2408.ht ... REzqI1ISM8

Regards
Sakthi S

Statistics: Posted by sakthinathan — Mon Dec 30, 2024 10:51 am — Replies 0 — Views 43

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