Electrical Engineering

Questions tagged [esp32]

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Does the ESP32's Long Range capability work with most smartphones?

Recently discovered an ESP32 can be its own access point (controlling or displaying data wirelessly through a web browser not connected to Internet). It also has long-range capability: Long Range (LR) ...
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11 views

Use a transistor or MOSFET as a switch to control a solenoid

I am working on a project to control a solenoid (12 V/DC 12.96 W) with an ESP32. I have attached a circuit design as it is in picture. I have couple of questions: Would this circuit work properly? Do ...
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2answers
28 views

CD4052 multiplexer with different input voltages

I've been working on designing a PCB for my indoor garden and i'm facing a problem i dont understand. In my design i use a multiplexer (cd4052), to choose which sense resistor my current sensing chip (...
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17 views

What are the most reliable pins for stepper driver (Enable Step Dir) for ESP32?

Uploading code to ESP32 cause noise on motor pins with undesired motor movement until upload started, Probably due Z state of pins. Some capacitor on ESP32 EN pin or pressing button on the ESP32 board ...
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1answer
58 views

How to safely use a transistor to control fans

I'm working on a project where I control two 12V 80mm fans with an ESP32. I've taken inspiration from various blog posts about fan control on the Raspberry Pi with a transistor (e.g. https://fizzy.cc/...
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120 views

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 ...
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69 views

Automatic power source selection circuit

I'm working on a project consisting of an ESP32 development board and a breakout PCB. I'd like the project to operate both with and without a USB cable connected to the ESP32. The ESP32 has an on-...
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2answers
80 views

Should RF output of (30+j10) Ohms be matched to 50Ohms for antenna matching network?

I'm designing a matching network for a 2.4GHz inverted F antenna. I am using an ESP32-D0WDQ6 MCU, and reading from the datasheet, the output impedance for the RF pins is (30+j10) Ohms. (DATASHEET in ...
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2answers
63 views

Achieve 6.6V DC using 2 or more ESP32 output pins in series?

I need to use the ESP32 to trigger a SPDT relay. The output of a single pin is insufficient to surpass the relay's threshold. Can I combine multiple pins to achieve greater voltage? This ...
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24 views

Wireless CAN bus analysis latency

I'm developing a CAN bus to WiFi bridge for car diagnostics using some commercial interfaces but sometimes I see latency can get high and some ECU's does not work, but some others do work, for example,...
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17 views

Communication between Ebyte E32-86820D and SX1278 Lora on ESP32 TTGO V1.6

Had anyone ever tryed to connect between the Ebyte UART module and the TTGO ESP32 Lora module at(868MHz)? I'm currently using two libraries for each module and I'm unable to transmitte a signal ...
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1answer
52 views

ESP32 stalls b/c of current spike (inrush current) - how to limit inrush current?

I have a circuit with several neopixels and an ESP32 MCU running with micropyhton. Under full load, the circuit including the ESP32 draws around 200mA at full load. Now I'd like to add another ...
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23 views

SIM7020G nb-iot module interface with esp32

My code at the moment is to connect esp32 to MQTT server via wifi and its working completely fine. The next step is to use sim7020G NB-IOT module to achieve the same connection but as I have never ...
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42 views

MOSFET for 3.3v MCU

I'm building a custom board with ESP32-WROOM-32E that can supply 3.3v trough the GPIO. I need to power a screen using 3.3v power. I'm looking for a way to power off the backlight using the GPIO pins ...
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15 views

Keep ESP32 non-RTC GPIO pin state HIGH in deep sleep

I'm trying to solve this in firmware before I move on to a hardware solution. I've got custom PCBs and I don't want to resolder / reorder them just yet, if I don't have to. Just like this guy [1] I'm ...
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28 views

ESP32 with CCS811: i2cCheckLineState(): invalid state sda(21)=1, scl(22)=1

I’m having issues with connecting to CCS811 CO2 sensor using Heltec Automation WiFi Kit Masterhawk ESP32. I am using PlatformIO in Arduino mode to build and flash the code. Here’s what my wiring looks ...
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2answers
40 views

Similarities/differences/Interfacing between ESP32 and RaspberryPi

I am new to the field of micro-controllers and stuck with some basic understanding wrt ESP32. I referred a few documentations but I am not able to figure out following things: In RaspberryPi we make ...
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1answer
39 views

Receive bipolar analog signal with sampling rate of 10 kHz

I wish to receive time-stamp data of a bipolar analog signal (analog signal that oscillates about 0 volts) from a sensor (which can only send analog data as an output) into ESP32 at Nyquist sampling ...
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46 views

Problem in Computing the Energy in Energy Meter using ESP32

So me and my groupmates are been working on with our thesis project about energy meter. In our project, the esp32 is the main board we are using. We also have voltage sensor (ZMPT101B) and current ...
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1answer
50 views

Can a capacitative touch switch provide multiple response levels?

After recently discovering the ESP32, I've been inspired to attempt my first electronics project. It will be a very simple wifi-enabled light. I thought I would take advantage of the capacitative ...
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1answer
39 views

GNSS module direct grounding to ESP32 increase sensitivity

I have a simple cirquit that composes of the following : ESP32-DevKit-LiPo (ESP32-WROOM) GNSS Module Beitian BN-357P with ufl connector for external antenna GNSS Active Patch Antenna My simple is ...
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2answers
97 views

How far can a WiFi signal reach in snow?

I am a kid from the mountains. If a person comes into an avalanche the people carry a device which sends and receives. The mates can then search for the victim with their one device(s). If I would ...
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1answer
70 views

Why doesn't ESP32 support NAND flash?

Simple question, but I can't find anything on the internet about it. Why would Espressif not support NAND flash when it is the more economical option? I ask because I'm trying to integrate a 128MByte ...
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18 views

esp32 program burn for production

please. I want to burn a code on esp32 so no one can access it afterwards.I want to go to final product development. i am using micropython and upycraft.
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1answer
109 views

Why does my mcu keep dying?

I've recently had my first pcb made, to my surprise, everything was working, at least it did at first. It's a simple board that lets me control some ledstrips with an ESP32 through wifi. Everything ...
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1answer
31 views

ESP32-cam or another camera for shooting at short distances

I am trying to automate my mechanical water meters. It looks like this: They are in a place that is difficult to get to, so I thought to place cameras, but distance between the meters and the wall is ...
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22 views

ESP32 using BLE but not WLAN

I want to build a little gadget which must use BLE to communicate with a smartphone, but should run for at least 24h using a 500mAh battery. So I think to achieve this, I should be able to switch off ...
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1answer
92 views

Interfacing the ESP32 A2DP Sink via I2S with the STM32

hope y'all are well and safe. I am back again! Woooo! Problem: The sound produced is really glitchy and the audio can be barley made. Setup: I have an ESP32 using the A2DP profile as a BT sink to ...
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1answer
57 views

DIY LED controller

I am building a LED controller using an ESP 32 and IRLB8721 mosfets. I have 3 RGB LEDs hooked in series. The whole thing is powered by a 12V power supply which says it is set into outputing only 350mA ...
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1answer
21 views

Using ESP32 to program a SAM

I'm building a device that will feature the ESP32 as the main microcontroller, and have a SAMD10 onboard for taking care of the precision timer stuff that TC's and TCC's are oh so good at. I would ...
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19 views

Waveshare 10dof 9255 with ESP32 problem

I can't get anything sensible out of my 10DOF from waveshare, https://www.waveshare.com/10-DOF-IMU-Sensor-C.htm. I'm still just trying to get ANYTHING out of it. I have it connected with SDA+SCL to ...
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63 views

SIM7600SA 4g module to ESP32

I am in a middle of getting the required components for my project. I will be using ESP32 microcontroller and SIM7600SA module for 4g/lte.. Since, I am a beginner in this field, can someone suggest if ...
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1answer
42 views

5v power supply upgrade for an ESP chip and a couple dozen relays

I have remote setup of one ESP32 chip, with a couple of sensors on it and 3 relay boards (total 16 relays). I currently power them with two separate phone usb chargers. One charger for the ESP chip (...
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33 views

Issue with ESP32 programming circuit using CP2102N

I've designed a custom PCB that uses a ESP32. At first I was using a CP2104 as USB to serial IC to program the ESP32, that worked without issues (I was able to program the ESP32 using the arduino IDE)....
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37 views

ESP32: How can I shorten wifi-connection time to AWS?

ESP32 is sending temperature and humidity data from sensors to AWS over wifi and it's working otherwise fine, but wifi-connection is "on" for about 20 seconds. I'd need to shorten the ...
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5answers
2k views

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)....
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0answers
71 views

ESP32 with JGY-371 stepper motor and L293D

I'm currently trying to make an automatic chicken coop door, I plan to use an ESP32 with an L293D motor driver and JGY-371 geared motor 30RPM (shop link). The door should not exceed 1kg and should ...
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23 views

Remote device bluetooth device SCN and device address

I'm programming on my esp32 bluetooth with C but I have no idea what does "Remote device bluetooth device SCN" and "Remote device bluetooth device address" mean. I think "...
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1answer
29 views

ESP32 WROOM switching back from MicroPython to Arduino framework

I have recently switched my ESP32's firmware to work with python (using Thonny IDE) and I want to switch back to work with C++ and Arduino IDE, but I remmember flashing that bin file on the device. Is ...
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1answer
55 views

ESP32 (WROOM32) consuming ~77 µA (much too high!) in deep sleep

I tried to reduce the current consumption of a ESP32 in deep sleep with the ULP enabled. However, the best I can achieve is about ~77 µA of current consumption. I'm using a very minimalistic carrier ...
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1answer
122 views

How to detect impending user touch before it happens?

I would like to detect an impending human touch on my microcontroller (I use an ESP32) - before it happens and setoff some kind of beeper (nasty humans, yees... touching electronics when you know you ...
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60 views

Is it possible to control the color of 50-100 RGB LEDs using an ESP32?

I'm wondering if it's possible to control the color / brightness of 50 - 100 RGB LEDs using an ESP32 If so what is the wiring? These would be 4-pin RGB LEDs that are common anode where the voltages ...
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1answer
30 views

Finding EAGLE BOM Parts

I'm trying to source parts to build my own Huzzah32 (ESP-WROOM32 Dev board) and have grabbed the BOM from Eagle: BOM: I've found certain parts that are more 'unique' to me, at least, such as the USB-...
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1answer
67 views

ESP32-PICO-D4 can it work raw?

Can this system in package be used raw without any other components(resistors,capacitors,inductors,crystal etc)? If I create a test board with holes for every pin to test it with arduino ide would it ...
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43 views

Problem with CH340C

Hi I made a board that contains an ESP32-WROVER and an USB to serial adapter ch340c but it's not visible when I connect it to the PC (Windows 10). I tried to install the ch340 driver and I even tried ...
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0answers
56 views

Li-ion charge / discharge circuit with ESP32 and MOSFET

Here is what I’d like to do: Wire a circuit that can either charge or discharge a single li-ion cell (3.0 to 4.2 V) or just do nothing at all. An ESP32 controls the circuit (max. 3.3 V). An INA219 ...
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1answer
43 views

Using the same ESP8266's GPIO for 3.3v and 5v

I am designing a pcb which should receive various types of sensors. The microcontroller is an ESP32 and the external input are RJ11 linked to I2C GPIOs of the uC. I have already planned a LevelShifter ...
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2answers
167 views

Is it possible to connect USB 3.1 Type C to ESP32?

So, I once looked at the pinouts of USB 3.1 Type C: and I found out that there were RX and TX pins, but they had + and -. Is it possible to connect the serial pins to the ESP32,as there are two on my ...
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2answers
94 views

How can I read from an accelerometer through i2c/spi for ~1 second at frequency>2kHz with precise distancing between measures

Context goal My final goal is to perform an fft on acceleration signals with specs at least: band between ~10 and ~1000 Hz spectral resolution ~1Hz on a portable, cheap, low-power device. hardware I'...
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0answers
26 views

Battery for ESP32 + Capacitive Soil Moisture Sensor 1.2

I have got a very beginner question. I am planning to use the ESP32 microcontroller wired up with some sensors, such as this one The sensor has an Operating Voltage: DC 3.3-5.5V, so I was planning to ...

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