Hi All, In our existing design, we use STM32 MCU and now like to add Wi-Fi with MESH kind of application. Initally I assumed i can use ESP32 module with an AT Command firmware to create Wi-Fi Mesh application. However, after looking at the below page, it clearly points that AT commands do not suppor...

Hi All, Why do i measure only 3.0V on some GPIOs?

Hello All,

It was my multimeter loading the IO lines and reading it as 1.6V instead of 3.3V.
Thanks to all members who commented.

Hi ESP_Sprite,

I configured it as general input GPIO and i have an external pull-up resistor 1Mohm, but still measuring 1,6V only?
I added pullup to 3.3V.

Regards.
Velmurugan

Even if i configure the pin as output and make it is HIGH or low, I am reading 1.6V only. Totally weird to me. void setup() { // put your setup code here, to run once: Serial.begin (115200); Serial.print("Serial Init Success"); pinMode(39, OUTPUT); } void loop() { // put your main code here, to run ...

I removed 1Mohm pull-up resistor on one of the GPIO and read 0V.
As we enabled the pullup resistor, the pin voltage is expected to be 3.3V. I am not sure what would be an issue.

Hi @tommeyers,

Thanks for your response.
I enabled pull-up and still measuring the same 1.6V.
Code screedhot attached

Hi, I have 3.3V pullup on all ESP32 GPIO pins. The pull-up resistor value is 1Mohm. However, I am measuring only 1.6V on the MCU IO pin. I measured using multimeter. What could be the reason? The pull-ups are added on the following IO lines and readin 1.6V on all IOs. GPIO36 GPIO39 GPIO34 GPIO35 GPI...

Hi All, Newbie to ESP32 programming. Accidentally programmed the application firmware bin on the memory location 0x1000 using the following command, esptool --chip ESP32 -p COM32 --before default_reset --after hard_reset write_flash 0x1000 esp32.bin Seem i overwritten the bootloader at 0x1000 :( I a...

Datasheet snap:
If the device supports programming embedded/external flash through USB serial, then why the dev board is using USB to UART converter?