I have an external source that powers the pololus (a4988), while the esp32 is powered by usb. The only connections between the pololu and the esp32 are the STEP, DIR lines, and ground. If I turn off the usb source the reading of the i2c sensors is successful. If I turn on the 12 source, I start to h...

Hi everyone. I am developing a project with an ESP32 microcontroller. I have connected several sensors (8 sensors) to the I2C bus and the readings work correctly, all powered from the board's usb (esp32-wroom-32). Through the USB I also read the data from the computer. The problem happens when I try...

I am trying to read several vl6180x laser sensors from an ESP32. When connecting a single sensor to the i2c bus everything works perfectly, but when I connect more than 3, I can no longer read the sensors. I have tried removing all pullup resistors (vl6180x integrates a 10k pullup resistor in SDA an...