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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.

866 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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ESP32 ADC not good enough for audio/music?

I've heard that the ESP32's ADC isn't "good" enough for audio purposes. It's a 12 bit SAR ADC with a sampling rate of 200 ksps which is much higher than most consumer products use (44.1 kHz). Does 200 ksps not correlate to a 200 kHz sampling rate. I…
Jacob Lara
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ESP32 Dev Board DTR/RTS

I recently got an ESP32 development board. I also found the schematic to this board online but I got an question. Can someone explain to me, what this part of the circuit is doing? Schematic:…
Zedipl
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Weird PWM signal if powered by AC/DC source

I've developed a PWM LED strip dimmer equipped with a 230VAC to 5VDC converter and an ESP32 board (schematics below). If I hook up the oscilloscope to the input of the LED, the PWM signal shows weird behavior: It somehow jumps to negative voltages,…
JoLau
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Can ESP32 be used in a commercial application?

I am currently choosing a processor for my embedded robotics project. I have just completed a prototype with the ESP32 DEVKIT-V1 module. I hope to commercialize my product in the future, however, when looking at professional boards, I mainly see…
Tony
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Can I power an ESP32 through the Vin pin?

I can't find a clear answer on this through my searches, maybe someone here can help me. Can I power my ESP32 through the Vin pin? What is the best way to do it?
nunocv
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5
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2 answers

What could've killed my ESP32S MCU?

I'm making my project and I managed to kill 2 ESP32 boards. First time I thought it was just accident (me shorting 2 wires) because my cables were messy, but it happened again and the circumstances were pretty similar, so I suppose that the fist…
krystof18
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Is there a simpler way to latch a supervisor?

I’m currently designing a Li-Ion powered ESP32 circuit. The ESP32 has a minimum operating voltage of 3 V. So, my instinct is to use a 3.1 V supervisor to keep the ESP32 within an acceptable range. After the supervisor is triggered, I’d like to keep…
Miles
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Trying to understand the auto boot circuit

I'm trying to figuring out how this circuit works instead of just simply ripping it off from schematics found on the internet. I've seen this circuit on many designs (ESP32 Dev board and Heltec CubeCell dev board, etc.) Here is the schematic from…
Sandra
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ESD protection for ESP32 GPIOs

I want some of the ESP32's GPIOs to be accessible via 3.5mm headphone jacks or RJ11 jacks and therefore need suitable ESD protection. I wonder how much is needed for optimal protection. Conditions/constaints: The board is powered by a 12 V wall…
marcel
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ESP32 randomly dies after 10 minutes use

I've posted here before (this) and this could be considered a followup post. I've taken all the feedback into consideration which would make me belief to have a working version. However, after about 10-20 minutes of use, the thing just dies. It…
Cyborgium
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microcontroller shared power supply

Usually on the breadboard i power the microcontroller and then power all the other devices through the microcontroller. Now i want to move my project to an enclosure, and i'm consedering to power all the devices directly from the power supply, is…
nunocv
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APA102 I2C address

I have two chips that have the I2C (SDA / CLK) address clearly written in the data sheet. Can I can drive this APA102 LED with the same SDA / CLK lines as other I2C chips? What is the I2C address of the APA102? The datasheet doesn't have it, and all…
legoblocks
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Weird voltage drop when connecting a micro-controller board to a point in a voltage divider circuit

I'm trying to power my ESP32 which requires an operating voltage of 3.3 V. I have a 5 V, 5 A DC power supply so I set up a voltage divider circuit with a 5 kΩ resistor and a 10 kΩ resistor, therefore Vout = 5 V · (10k / (10k + 5k)) = ~3.33 V. When…
jasonmzx
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Why are the diodes used in this fashion for the RX and TX lines? They seem to be reverse biased

The diodes seem to be reverse biased, which doesn't make sense. This is from the Olimex Ethernet EVB.
navi
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