Ultrasonic circuit overvolts GPIO about freenove_ultimate_starter_kit_for_raspberry_pi HOT 3 CLOSED

Hi,

We will fix it and update soon.

Thank.

from freenove_ultimate_starter_kit_for_raspberry_pi.

Hi,

You are right. It is very safe to connect a 1K resistor between the gpio24 and the echo pin of the Ultrasonic module.

Although the working voltage of raspberry pi GPIO is 3.3V, in the input mode, the GPIO is in the high resistance state, and the internal resistance is close to infinity. Therefore, in this case, the echo pin of the Ultrasonic module will not damage the GPIO of raspberry pi.

Thanks.

from freenove_ultimate_starter_kit_for_raspberry_pi.

Wrong.

It doesn’t matter how high the internal resistance is. There is no overvoltage protection. The pins are not 5V-tolerant. The circuit, as printed, will damage the Pi.

Every other Raspberry Pi resource out there - including the official documentation - explicitly warns against connecting a 5V signal to a GPIO input pin.

Fix it.

from freenove_ultimate_starter_kit_for_raspberry_pi.