Electrical Engineering

Questions tagged [esp32]

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Good solution for TPS54202 input filter design?

I trying to make tps54202 switch regulator for esp32-wroom which would pass EMC test. https://www.ti.com/tool/TIDA-00948 By reading guidelines of designing they say that to pass EMC test you need to ...
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2answers
50 views

Is the TPS54202 buck converter a good solution to pass the FCC SDoC?

I want to design a PCB with the ESP32-WROOM module which has bluetooth. I want to pass the FCC verification. I would use a linear regulator, but it makes too much heat. My input is 14V car battery, ...
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0answers
35 views

esp32 relay control

I'm designing this circuit for my esp32. I need to control 2 dpdt relay 424012. One is on the board, the other off board. This relay controls both 220 V and 12 V lines. I'm using 2n2222a for switching ...
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0answers
36 views

ESP32 MOSFET Control with a Twist

Looking for some help with using an ESP32 (running Arduino IDE) to control a MOSFET. Currently, I have used the combo to control many things successfully by electronically "pressing buttons" by ...
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1answer
44 views

Best switching voltage regulator solution/circuit for esp32 module, that RF wouldnt suffer and would pass FCC verification?

I want make esp32 bluetooth project which would be powered from car OBD2 port. Input voltage ~14V, output voltage needed 3.3V, max current ~0.3A. Efficient way would be use switching voltage regulator ...
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0answers
18 views

ESP8266-12E & BPM180 - Bad pressure retrieved

I have NodeMCU (esp8266-12E module) and connected BMP-180. I try to read pressure from BMP-180 in async web request, but it reads bad value. For testing purposes I log pressure in loop() - and it's ...
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0answers
98 views

Failed to connect to esp32: timed out waiting for packet header when flashing

I have using an esp32 wrover b chip, an esp32 adapter, and a USB-serial converter. I am trying to flash micropython onto the esp32 via the usb-serial connector, but have encountered a few connection ...
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0answers
26 views

M5Stick turns off randomly

I recently got an M5StickC, and I'm programming it using UIFlow. I wrote some code for it, and it works fine for about 45 minutes (not plugged in, not on Wifi), then it just turns off for no reason. I ...
2
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1answer
40 views

IRF520 as a relay driver

I am trying to use IRF520 as a relay driver for ESP32, but by reason unknown it does not works. I have replaced it twice with a new ones, but yet it keep not working. I have 3V on the ESP32 pin when ...
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0answers
79 views

Replacing an ammeter with voltmeter?

I have found this circuit of a millivoltmeter, and it seems like something which as a hobbyist I can do it, and the range of the measurement is very suiting one of my projects, but I would like to ...
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1answer
30 views

What is the use of different ADC channels in ESP32- WROOM32?

I have a ESP32-WROOM32 Module , From datasheet shows its has two adc (ADC1,ADC2) with multiple channels . What is the use of these multiple channel? Is it possible to connect multiple analog sensor ...
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1answer
93 views

AC Nanovoltmeter for Arduino alike?

I have searched across web, but I am unable to find such a circuit. I am looking for a circuit of a AC nano-voltmeter in range 5-10 to 100 nV which output is suitable to be handled by some precise ...
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2answers
44 views

UPS for ESP32 Microcontroller [duplicate]

I have two e-bike batteries. One of which i am using to power my ESP32. Now i want to switch to other battery when my batt-1 is low. I am switching battery using relay. But doing so, I suspecting i ...
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1answer
50 views

IRLZ44NS mosfet + 3.3v gate

I'm considering using some IRLZ44NS mosfets that I have with an ESP32 that runs at 3.3v. Looking at the datasheet it says: VGS(th) - Gate Threshold Voltage - min: 1.0v, max: 2.0v It seems like this ...
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1answer
37 views

Can the Olimex ESP32-EVB be used in a commercial application?

My friend and I are very near a final product design, but we currently are using an Olimex ESP32-EVB relay module as part of the final system. Recently we were told by a consultant that the FCC could ...
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2answers
25 views

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: https://...
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2answers
57 views

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 ...
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3answers
56 views

Can I use a voltage regulator to bring high voltage down to 3.3V GPIO input for ESP32?

I have a button connected to the power rail of my project and I want to know when it's pressed with an ESP32 chip. Since the input voltage (6.5V to 15V) is higher than the maximum rating of the ESP32 ...
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1answer
85 views

Need help in designing custom ESP32 PCB

I am designing a custom PCB with ESP32 PICO MCU. I am going to use BLE peripheral mostly in my application. I have some questions regarding Which type of Antenna should I choose for my application? ...
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2answers
80 views

Is it good practice to use an ESP32 DevKit in a product?

I am developing a small electronic product which, if all works fine, I think about producing and selling in small numbers. Currently I use an ESP32 DevKit for the development. That is the ESP32 ...
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1answer
41 views

Is it possible to use Bluetooth serial and BLE client simultaneously in ESP32?

Is it possible to use classic Bluetooth and BLE at same time in esp32 with Arduino ? IDE - Arduino ide
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0answers
34 views

Driving laser modules with MCP23017 and MOSFETs

I would like to make a PCB to switch 16 laser modules on and off. The laser module in question is this one: https://www.sparkfun.com/products/9906 I believe the module already has a driver included (...
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1answer
57 views

Powering up an ESP32 with IO extender (MCP23017) and two of 8 channel relays from an external 5 V, 10 A power supply

I'm working on a project that needs an ESP32 board, IO extender (MCP23017), two of 8 channel relays and some sensors, I've powered up all of the parts from a stable 5 V, 10 A power supply as shown in ...
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1answer
48 views

ESP32 Sample a 1kHz square wave (10%-90% duty cycle) with analogRead()

I need to sample the peak voltage of a 1kHz square wave. The duty cycle varies between 10% and 90%. I am using an ESP32 and hoped to use analogRead() to sample the data. My first idea was to attach ...
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1answer
21 views

ESP32 - Can I safely use GPIO ADC2 pins for non-adc use while using WiFi

According to ESP32 design guidelines; ADC2 GPIO's should not be used when using WiFi due to conflicts. (or used with restrictions) This affects GPIOs 2,12-15 and 25-27. Suppose I use don't use any ...
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1answer
62 views

HX711 module VCC and no VDD

(Image source and more details: circuitio.io) I am trying to build the above circuit powered by battery alone. Sparkfun HX711 is expensive and hence I am using HX711 bought on Amazon. Here is the ...
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1answer
45 views

VSCode ESP-IDF framework esp32 SPIFFS error

I’ve beet trying for days and days now to make SPIFFS work on my esp32 board using PlatformIO in VSCode following the following example: https://github.com/espressif/esp-idf/tree/master/examples/...
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2answers
60 views

ESP32 I2C pin routing

I have looked through several documents, but I haven't find found a clear answer which pins on ESP32 support I2C communication. Can the I2C be routed to almost any I/O pins? Are there certain pins ...
1
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1answer
174 views

acs71020 Connecting and reading voltage properly

I am using an ACS71020 3.3V I2C version hooked up to ESP32. I have connected the IC as proposed in the datasheet. Rsense used is 1.8k ohm as proposed in the evaluation board user manual for 230-240 ...
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2answers
46 views

Continuous wave on SX1276

I'm trying to send CW (like hello world) with the SX1278 on ttgo t-beam. I've read the datasheet and some examples and come to this code: ...
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0answers
29 views

ESP32S: More than two SPI channels possible?

In a test with an ESP32-CAM, I was successfully able to use SPI with pins 2, 12, 14, and 15: ...
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0answers
22 views

ESP32 6x6 pi matching circuit

I'm trying to make my own ESP32 board, and everything so far seemed really self explainatory... expect for one thing. The ESP32-D0WDQ6 has an impedance of 30+J10 Ohm on the antenna pin, but I need to ...
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1answer
50 views

Program ESP32-CAM via FTDI without manual reset?

When programming the ESP32-CAM with an FTDI, I proceed as follows: Connect GPIO0 to GND. Reset the ESP32-CAM. (by cutting power)...