Electrical Engineering Stack Exchange
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Questions tagged [esp32]

For questions about the ESP32 series of microcontrollers. Use in conjunction with the "microcontroller" tag.

For questions about the ESP32 series of microcontrollers. Use in conjunction with .

See Wikipedia's article on the ESP32 for more information.

1034 questions
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ESP-WROOM-32 unable to flash with auto-program UART

I just made a custom schematic and PCB with an ESP-WROOM-32 module. The board has a USB-UART chip (CP2102) and an auto-program circuitry to flash firmware without pressing buttons, but it doesn't work: esptool.py stops with Failed to connect to…
ris8_allo_zen0
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How ESP32 auto upload issue has been fixed by adding capacitor?

My ESP32 NodeMCU need to press boot when upload new program from Arduino IDE. However, many sources suggest that we can upload without pressing any button by simply adding capacitor between EN pin and ground. But how? What is going on? Why does it…
M lab
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Question about ESP32-DevKitC V4, WROVER vs. WROOM

I am learning ESP32 and have a ESP32-WROVER dev board to work with. I have this board to work with and learn: As part of my learning journey, I found that ESP32 has many edition, and the following editions are commonly offered to purchase on Amazon…
Allan Xu
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ESP32 - Flash over USB with integrated JTAG

I'm unsure how I can program an ESP32-S3 without using the UART interface it has. In the past I always used a USB to UART converter and then I could flash the device over USB automatically, but could not use the JTAG for debugging: Previous…
HansPeterLoft
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Problem with ground stability in custom PCB (At least I think so)

At the beginning - I'm a hobbyist not professional so be merciful and expect some basic knowledge holes I'm not aware off ;-) I have some custom PCB with ESP32 uC powered up from Li-Ion with charging system built in. On the board there's also UART…
user8715154
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Unbalanced vocals and instruments in audio output of Bluetooth sink example (A2DP)

I have an issue with I2s config in the context of a Bluetooth speaker project based on ESP32 and PCM5100A (along with PAM8909 as amplifier). This is my config: mode = I2S_MODE_MASTER | I2S_MODE_TX, .sample_rate = 441000, .bits_per_sample =…
Mohammed BENHADINE
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ESP32-based water tank module

I've finished the initial revision of my module. I'm just wondering if anyone has any feedback for the schematic layout. Is there anything that I could have done better? This small module will be used with a water tank to: control a relay to switch…
robbrown92
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ESP32 and Arduino compatibility

As I am learning ESP32 I found that many Arduino libraries and sample code run on ESP32. That confuses me. Is ESP32 a variation of Arduino? Is there any article that I can read and learn more about this compatibility and how some of Arduino…
Allan Xu
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ESP32: wake-up caused by touchpad

I'm testing deep-sleep mode on my ESP32 DEV kit board. For this purpose I've uploaded this code: #define uS_TO_S_FACTOR 1000000 //Conversion factor for micro seconds to seconds #define TIME_TO_SLEEP 5 //Time ESP32 will go to sleep (in…
M4Biz
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Applying a PWM signal to a 12V fan with a 3.3V microcontroller?

I have an ESP32 microcontroller that controls a power relay connected to a 12V, 42W fan. The ESP32 itself is 3.3V but the dev board I'm using has an onboard regulator that takes a 5V input. The fan has a separate wire that will accept a PWM signal…
jamieb
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Wifi functions crashing ESP32-WROOM-32 based board

I've designed a custom PCB which uses the ESP32-WROOM-32 module. I'm using arduino to help validate the board, and I am able to run very simple programs on it successfully (ex. serial echo, Blink, etc...) Where I'm having trouble is running any Wifi…
MikeJWms
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Improved ESP32-CAM?

Is there something better than the ESP32-CAM board? In therms of image quality and streaming capabilities? To make a good quality WiFi camera. EDIT: To be used in DIY projects like the ESP32-CAM, a small board with a small camera. At least WXGA…
Pedro NF
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Why the unusually high "LOW" voltage when pressing NodeMCU ESP-32s boot button?

I bought a ESP-32 development board and I'm having a lot of trouble with a button on the GPIO00 pin. This is a strapping pin on the ESP32 chip; when set to LOW on startup, the chip enters the bootloader. There's a convenient button on the…
csiz
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HT7833 drop voltage confusion

I am designing a sensor based on ESP32-C3-13 module and sending sensor value over ESPNOW to another ESP32-C3-13. The circuit has HT7833 LDO and supplied by one 3.7 V 2500 mAh LiPO. During the send process around 3.5 V battery voltage level input to…
Orkun Gedik
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Reverse PNP to NPN endstop logic

I bought a CNC control board equipped with Teensy 4.1 and the T41U5XBB to replace the mks dlc32. I am sorry to discover that the endstop pins of the new board only accept NPN sensors, both NO and NC. My current system has 3 PNP NO sensors that work…
Biagio Di Stefano
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