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Questions tagged [esp32]

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

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10 µF and 0.1 µF capacitors not making any difference in filtering out noise

I have two circuits (green and brown) featuring a load cell, HX711, and ESP32-C3: The HX711 and ESP32-C3 go on top of those round female pin header. The only difference between them is that one is ...
wyc's user avatar
  • 273
0 votes
0 answers
28 views

ESP32-S3 SD Card not working

I am trying to interface an SD card with my ESP32-S3 module. The code I am using as follows. ...
Cobalt Gray's user avatar
0 votes
2 answers
110 views

Caps vs. no caps = the same noise?

This is a setup with an ESP32-C3 and HX711. In this oscilloscope reading, there is a 10 μF cap and a 0.1 μF cap across the VCC and GND of the HX711 (it makes the load cell readings more stable). In ...
wyc's user avatar
  • 273
0 votes
1 answer
31 views

ESP32 resetting Adafruit EMC2101 (TCA9548A) using a 10k resistor?

Do I just need to add a 10 kΩ resistor on one of the GPIO pins of my ESP32 in order to use it to connect to the TCA9548A (Adafruit EMC2101) reset pin? The RST pin on the TCA9548A (Adafruit EMC2101) ...
StealthRT's user avatar
  • 797
0 votes
1 answer
61 views

Capacitor in series with a button

I'm working on making my old Lift Master / Craftsman / Chamberlain garage door opener 'smart'. The original control panel uses two wires at 22 volts to control 3 functions - door toggle, light toggle, ...
Maksym's user avatar
  • 131
0 votes
3 answers
44 views

Esp32 controls a 12v coil relay through PC817 and 2N7000

I need to control a 12v relay with an Arduino nano ESP32. Can somebody check if the circuit I designed is good? Components list: MOSFET: 2N7000 (N-channel); Optocoupler: PC817; Diode: 1N4007; Relay: ...
PaoloRos's user avatar
1 vote
4 answers
136 views

74HC595 behaves randomly, need help with my circuit

I'm trying to make a Nixie clock based on an ESP32. I've made a working prototype on a breadboard. Only the 74HC595 part, which is where the problem is at: I then made a PCB: After soldering ...
TakeHere's user avatar
0 votes
0 answers
17 views

Can I give different delays for different parameters while using BLE

I'm working with the BLE transmission. I have to transmit 4 to 5 parameters at the same time but with different delays. Can I do this?. Is anyone have any idea? Here is my part of code to transmit ...
GnanaBarathi SP's user avatar
0 votes
1 answer
62 views

How to simulate ESP32 camera board?

I couldn't find any ESP32 Camera board simulator online, even popular embedded systems simulator like wokwi didn't provide. Perhaps you can tell me if there is any existing ESP32 Camera Board online. ...
Muhammad Ikhwan Perwira's user avatar
0 votes
1 answer
51 views

Is putting capacitors in both ESP32 and HX711 overkill in this circuit?

I was getting erratic readings from my HX711, which was receiving power supply from my ESP32. I figured it was catching noise and power fluctuations from my ESP32. So I added a 0.1 μF capacitor and a ...
wyc's user avatar
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0 answers
38 views

ESP32-WROOM-32UE cannot be powered and loaded with firmware

I designed a custom ESP32 board (schematic attached). I am using an ESP32-WROOM-32UE. My schematic is based on the ESP32-Devkitc-V4 board from Espressif (schematic attached). When I connect the board ...
Alexander idid's user avatar
0 votes
1 answer
38 views

Reliable battery power converter for ESP32 [closed]

I have seen similar (but just similar) questions here, so I decided to ask anyway. What is a buck-boost module, preferrably from Aliexpress, that I can use to power an ESP32 with 3.3 V from a 3.7 V ...
Clóvis Fritzen's user avatar
0 votes
0 answers
70 views

Purpose of NPN transistors in this ESP32 circuit

I am wondering what is the purpose of the two NPN transistors Q4 in the circuit below. (full circuit schematic) In this circuit, which is from an eval board for the ESP32-S3 microcontroller, ...
jemalloc's user avatar
  • 720
0 votes
2 answers
64 views

Inrush current: Additional capacitor or NTC to handle voltage spikes?

I will power an ESP32-S3 using a LDO (MCP1825S) which will require a 1 µF capacitor on the input and a 10 µF capacitor on the output. Both of them are ceramic ones, so typically have a low ESR: In a ...
Tintenfisch's user avatar
1 vote
0 answers
40 views

Flashing ESP32-S3 directly over USB

Since the ESP32-S3 offers USB-OTG, am I right if I assume that I only need to turn on the chip by pulling EN to high (3.3V) and then connecting it via USB to my PC? Am I then able to flash it via ...
Tintenfisch's user avatar
2 votes
2 answers
345 views

How long is it okay for pin to be floating during MCU startup?

I’m using an ESP32-S3 to communicate with a 5V-only LCD module with an i8080 parallel bus interface. To shift the levels, I’m using the SN74LVC8T245 bidirectional level shifter. This means I can both ...
Emil Eriksson's user avatar
1 vote
1 answer
84 views

USB and RS485 on same lines for ESP32-S3

For an ESP32-S3 based PCB that I am developing, I would like to be able to share 1 connector for two different communication protocols. USB connection directly to IO19 and IO20 of the ESP32-S3-wroom1 ...
Wouter Van Rompaey's user avatar
1 vote
1 answer
52 views

Is it okay to not connect the bottom thermal pad of esp32 wroom to ground?

The bottom thermal pad (epad) of esp32 wroom is left floating instead of connected to gorund. I looked at the datasheet and found out that I need to connect it to gnd. The pcb works, but I'm worried. ...
HUJIN SHIN's user avatar
0 votes
1 answer
42 views

Motorized Valve Wiring with ESP32

I am looking to connect this motorized valve with circuit as follows with a ESP32 https://www.sensoware.com/docs/electrical-connections/sa301/ I am planning to use a relay to trigger the Red wire and ...
Santhosh Kumar's user avatar
0 votes
0 answers
51 views

SD card via SPI: any way of getting it out of stuck state after aborted SPI operation(s) without power cycling it?

using ESP32 and its IDF platform libraries to access SD card via SPI, we have a situation where e.g. panic reboot of ESP32 leaves the SD card 'stuck' such that it cannot be mounted any more after ...
tangram's user avatar
4 votes
3 answers
422 views

NCP1117 (3.3V LDO) with ceramic and aluminum electrolytic capacitors

For my ESP32 project I want to use a NCP1117 3.3V LDO and soon the question came, which capacitors are suitable if the LDO is driven either by USB or a 5V power supply while the cable length is about ...
Tintenfisch's user avatar
0 votes
0 answers
52 views

Help Needed: ADNS-9500 Optical Sensor Movement Detection with ESP32 Wroom

I'm currently working on a project with an ADNS-9500 optical mouse sensor and an ESP32 controller board. The aim of the project is to move the optical sensor and have the ESP32 recognise the movement. ...
A.invents's user avatar
0 votes
2 answers
103 views

ESP32: How can I use USB for data only, but always require external power?

I am creating a PCB where a ESP32-S3-WROOM-1 sits on, which shall be powered by an external power supply (and a NCP1117 3.3V LDO) and not by USB. However, I will use USB to flash the ESP32, so the PCB ...
Tintenfisch's user avatar
0 votes
0 answers
41 views

ESP32: Does PCB without copper affect the keep-out zone of the antenna?

Espressif recommends in their PCB Layout Design that the antenna is placed outside of the board, either top right or bottom right. Interestingly a placement to the top left or bottom left is not ...
Tintenfisch's user avatar
0 votes
0 answers
25 views

ESP32-C3 framework location and how to change it

Our software package to date contains several projects for different STM32 MCUs. All projects and shared libraries are located under the same GIT repository root. There is a very convenient setting in ...
Maple's user avatar
  • 12.9k
2 votes
1 answer
65 views

Using a microcontroller to make a bluetooth MP3 player [closed]

I need to make a Bluetooth MP3 player for a particular use. I have worked with microcontrollers such as Arduino, RPi, Pic16F and Pic18F, but need a suggestion on how to build for this scenario: I need ...
Aditya Majumdar's user avatar
1 vote
0 answers
43 views

ESP32-C3-MINI-1-N4: can't establish Serial connection but can flash code

I've recently build my own dev board utilizing the ESP32-C3-MINI-1-N4 module. Everything works pretty well and just as expected, I can control a few onboard LEDs just fine and upload code and ...
EmilEmilchen's user avatar
0 votes
0 answers
45 views

TPS63020 buck boost converter, how to use ENABLE pin?

I'm using a TPS63020 board connected to a small LIPO battery to power an e-ink display and driver. I'd like to use an ESP32 board to control the ENABLE pin (so I can shut down the e-ink display and ...
Jan's user avatar
  • 1
0 votes
1 answer
44 views

LIS2DW12TR accerometer overheating massively when connected with I2C

I have 4 LIS2DW12TR accelerometers connected to an Seeed Studio ESP-32 S3. The accelerometers get extremely hot when they're connected to 3.3V. They are not recognised with an I2C scan. The ...
okay_computer's user avatar
0 votes
3 answers
108 views

Detect logic 1 with 5V on 3.3V GPIO pin

I need to detect a logic 1 by applying 5V to a GPIO pin of an ESP32-C-DeVKitC-02. However, I don't think the GPIO is 5V tolerant. My questions are: Why can 5V already be to high for a GPIO? Doesn't ...
Tintenfisch's user avatar
1 vote
1 answer
77 views

Can I operate DVD Drive Tray Mechanism without PC? [closed]

I want to make a motorized drawer using a broken DVD drive. I'd like to use the tray mechanism as a whole if possible. I can drive the motor by directly applying power to it, but I don't want to add a ...
sword1st's user avatar
  • 113
0 votes
2 answers
59 views

What happens if misconfigured input GPIO delivers 3.3V if it is connected to 3.3V to detect high?

Let's say I have GPIO0 on an ESP32 which is configured as input pin using an external 4.7K Ohm pull-down resistor to ground. Default state therefore is low. When I ...
Tintenfisch's user avatar
0 votes
1 answer
37 views

Do ESP32 GPIO pins with roles such as 'BOOT' affect my program?

I am working with an ESP32-C-DeVKitC-02. I do flash it via USB: There are pins with roles such as LOG or BOOT. Will they affect ...
Tintenfisch's user avatar
0 votes
1 answer
51 views

Issues with 2-Channel Relay Songle SLA-05VDC-SL-C Stuck in NC State

I am experiencing an issue with a 2-channel 30A relay (Songle SLA-05VDC-SL-C). The relay always remains in the NC (normally closed) state and does not switch to NO (normally open), even when I try to ...
Lucas Buchalla Sesti's user avatar
0 votes
0 answers
79 views

Why did my microcontroller emit smoke?

My setup is as follows: I have an RGB LED driver board powered by a 24V SMPS. The microcontroller, an ESP32, is connected to the driver board by RGBW PWM lines and a ground line. The ESP32 is also ...
flimsy's user avatar
  • 362
0 votes
2 answers
103 views

Why does RS-232 Communication fail between these 3 ESP32's?

What's the Goal? Trying to get two esp32's to communicate over their UART lines using RS-232. My initial inspiration and idea for the connections was based on https://esp32io.com/tutorials/esp32-rs232 ...
jouell's user avatar
  • 117
0 votes
1 answer
32 views

How to prevent power fluctuations on strong Electromagnetic Lock (2A)?

I'm learning how to control strong Electromagnet Lock using ESP32 microcontroller, but I'm having problems with board freezing at the end of relay activation. So the Lock works, but then the board ...
madneon's user avatar
  • 105
0 votes
1 answer
115 views

Noise in audio project with ESP32

I built a very simple web radio based on a PCM5202 module (purple with 3.5mm output jack), an ESP32, and this github project. Here is the schematics (forgive the crudeness) simulate this circuit &...
Jerther's user avatar
  • 224
0 votes
0 answers
34 views

ESP32 getting brownout!

I have designed a fan controller circuit using esp32. The circuit was working when I connected with a bulb. When I connected with a fan the chip is getting turned on and immediately it turns off. This ...
Aakas Pulikkal's user avatar
0 votes
0 answers
18 views

How to monitor via serial monitor ESP32-H2 board while it is powered by external power source?

I'd like to monitor (via serial monitor) my ESP32-H2 while is powered from an external power source at 3.3 V or 5 V. I think that I must use an USB connection to the board but for this purpose (...
M4Biz's user avatar
  • 359
0 votes
0 answers
25 views

Fan controller using ESP32

I have designed a fan controller using ESP32. It was working fine initially when we checked by giving the bulb as load. After that we connected it to a fan, and then it started brownout during the ...
Aakas Pulikkal's user avatar
0 votes
1 answer
56 views

ESP32: Detect switch or button state / GPIO to GND vs GPIO to 3.3V

I want to detect a binary switch state - better said a logic 1 or 0 via a PC817 optocoupler - and my question is, if both of these ways are correct: A) Connecting the GPIO input pin via the ...
Tintenfisch's user avatar
0 votes
0 answers
26 views

Troubleshooting power issue in LilyGo T4-S3 ESP32

I put a custom expansion board onto the nice T4-S3 devices' 2x15 header. But displaced by 1 pin (2 pins off) and shorted something out. Need help on how to troubleshoot and id the destroyed components....
Diego Alacerna's user avatar
0 votes
0 answers
26 views

ESP32 rebooting on gpio LOW

I am using esp32-wroom-32 module to turn on/off the 24v electronic solenoid valve using 5v relay. Detailed circuit is shown in the image below. However according to my observation whenever the ...
java bee's user avatar
0 votes
0 answers
74 views

PAM8403 weird clicking / banging noise

I'm using an ESP32, a PCM5102, and a PAM8403 to output a 3.5mm Audio Jack output. In my circuit, I'm sending the Audio Signal via I2S to the PCM5102, where a quieter output can be picked up. If the ...
Tom's user avatar
  • 1
0 votes
1 answer
37 views

FDC6333C N & P−Channel MOSFETs on waveshare ESP32-S3

I'm stumbled upon the schematic diagram from waveshare ESP32-S3-PICO and doesn't understand much on the so called "Save power" circuit diagram. From the picture, the connection from VUSB and ...
Kenny Thum's user avatar
0 votes
1 answer
77 views

ESP32 Schematic review, can't flash using U0TXD U0RXD

Hello 👋🏼 I'm reaching for help, i tried debugging the issue with my current knowledge but to no avail... I have created a ESP32-D0WD-V3 based board, It's pretty basic and cover what i need in a ...
Rayen Ben Ammar's user avatar
1 vote
2 answers
109 views

ESP32 PCB Review [closed]

I am currently designing a PCB to be manufactured. This version is my attempt at a working prototype. I am new to PCB design but am open to accepting any help I can get! My part is meant to function ...
AmateurEnthusiast's user avatar
0 votes
2 answers
85 views

ESP32-H2 doesn't work fine when powered via external power supply and 3V3-Battery pin

I've a new ESP32-H2 that works fine as a Matter device if it is powered from USB port. When I try to power it from 3V3-Battery pin using a very reliable power supply (Keithley Model 2231A-Triple-...
M4Biz's user avatar
  • 359
1 vote
1 answer
185 views

Windows doesn't recognize ESP32-S3 with USB OTG Console on a custom PCB

I made my first custom PCB with an ESP32-S2FH4R2 (datasheet). Since I also want to use the integrated USB OTG Console of the ESP, I connected GPIO 20 to D+ and GPIO 19 to D-. When I connect my PCB to ...
Omega's user avatar
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