![]() It is internally connected to a 10k Ohm pull-up resistor. To make the ESP32 run “normally”, you just need to disconnect GPIO 0 from GND. GPIO 0 connected to GND » ESP32-CAM in flashing mode.When GPIO 0 is connected to GND, the ESP32 goes into flashing mode and you can upload code to the board. This GPIO is internally connected to a pull-up 10k Ohm resistor. GPIO 0 determines whether the ESP32 is in flashing mode or not. However, you won’t be able to open the Serial Monitor and see if everything is going well with your setup. ![]() You can use GPIO 1 and GPIO 3 to connect other peripherals like outputs or sensors after uploading the code. Learn how to upload code to the ESP32-CAM AI-Thinker. The best way to upload code to the ESP32-CAM is using an FTDI programmer. Because the ESP32-CAM doesn’t have a built-in programmer, you need to use these pins to communicate with the board and upload code. GPIO 1 and GPIO 3 are the serial pins (TX and RX, respectively). If you want to have an output of 5V on the VCC pin, you need to unsolder that connection and solder the 5V pads. If you look closely, you should have a jumper on the 3.3V pads. In our case, the ESP32-CAM outputs 3.3V whether it is powered with 5V or 3.3V. You should not use that pin to power the ESP32-CAM. There’s also the pin labeled on the silkscreen as VCC (colored with a yellow rectangle). ![]() However, many people reported errors when powering the ESP32-CAM with 3.3V, so we always advise to power the ESP32-CAM through the 5V pin. You can power the ESP32-CAM through the 3.3V or 5V pins. The ESP32-CAM comes with three GND pins (colored in black color) and two power pins (colored with red color): 3.3V and 5V. You can download a PDF file with better resolution on this GitHub repository. The following figure shows the schematic diagram for the ESP32-CAM. The following image shows the pinout diagram for the ESP32-CAM AI-Thinker. In this guide, we’ll take a look at the ESP32-CAM GPIOs and how to use them. The ESP32-CAM is a development board with an ESP32-S chip, an OV2640 camera, microSD card slot and several GPIOs to connect peripherals. ![]()
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